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Convert speaker spikes from quadrupod to tripod
James Harris wrote:
Any ideas? Widening the net a little.... Spikes is a concept that seems woefully short of merit, while vibration absorbers is known and described in the literature as efficient in terms of reducing midrange coloration via secondary radiation from the floor. Literature reference: accellerometer measuments made by Arne E. Jensen on his 4433 and the floor they were located on and published in the danish magazine High Fidelity around 1978 or so. Poul Ladegaard took this a step further by demonstrating the additional advantage in decoupling the (midrange) loudspeaker unit from the front panel. It would be most interestering if the spikists have similar accellorometer measurements that document the advantage of spikes. James Kind regards Peter Larsen |
Convert speaker spikes from quadrupod to tripod
On Mon, 24 Aug 2009 17:07:49 +0100, "Keith G"
wrote: (I remember once I got someone to listen with his eyes shut while I slowly rotated one speaker until it was facing the wall - he had no idea what was going on and said the sound was unaffected throughout!! ;-) Yes, the Critical Distance for a given room/speaker combination is often closer than you think! In PA applications sometimes it's practically impossible to place the audience inside it. Where's your hi-fi listening "sweet spot" in relation to the CD? In any given room, the same for all speakers or not? When recording, I'm used to monitoring well inside, but checking a mix from WAY outside - like in the next room with the door shut! |
Convert speaker spikes from quadrupod to tripod
GregS wrote:
Another thing, if the floor is vibrating from the air vibrations, and the speaker is still, the floor will make the speaker shake. Yes. But if the floor is vibrating from the air vibrations, you have a more serious problem than that. A common one, but serious nevertheless. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
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Convert speaker spikes from quadrupod to tripod
David Looser wrote:
"Laurence Payne" wrote in message My practical experience of large speakers - some much larger than anything found in a domestic setup - is that they generally sound MUCH better mounted at least a small distance away from any flat surface, wall or floor. At one time there was a fad for mounting speakers as far into room corners as possible. My granddad, who was something of a "HiFi" enthusiast in the 1950s built a speaker cabinet which used the walls and floor as part of the cabinet. I seem to remember that a barrow-load of sand was part of it as well. The corner horn had some advantages: first of all it meant that you could take advantage of the edge effects of the corner to provide increased bass response, and secondly that bass boost was predictable because everyone would put the speaker in the same place in every room, rather than have it an unknown distance from the rear and side walls. It made sense back in the fifties when loaded horns were essential for high efficiency at low frequencies, in an era of low amplifier power. Back then, systems were mono and so the inability to place the speaker for good imaging was a non-issue. When stereo came in, corner horns went away. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
In article ,
Laurence Payne wrote: On 24 Aug 2009 12:33:37 -0400, (Scott Dorsey) wrote: Reading at face value, that reply states that spikes either couple or decouple the speaker from what it's standing on. Depending on which you WANTED them to do. This can't be right. What DID you mean? It depends on what you do with the spikes and where you place them. The original intention was to couple the speaker through a carpet to a solid floor, so the floor and the speaker move as a system. But they can also be used with a flexible material like a rubber pad to decouple the speakers from the floor. In the second case, why spikes? Why not just the rubber pad? You want to minimize the area of contact with the pad. Plenty of more efficient ways to do that than spikes, mind you, but spikes are usually what people have handy. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
"Scott Dorsey" wrote in message
... David Looser wrote: "Laurence Payne" wrote in message My practical experience of large speakers - some much larger than anything found in a domestic setup - is that they generally sound MUCH better mounted at least a small distance away from any flat surface, wall or floor. At one time there was a fad for mounting speakers as far into room corners as possible. My granddad, who was something of a "HiFi" enthusiast in the 1950s built a speaker cabinet which used the walls and floor as part of the cabinet. I seem to remember that a barrow-load of sand was part of it as well. The corner horn had some advantages: first of all it meant that you could take advantage of the edge effects of the corner to provide increased bass response, and secondly that bass boost was predictable because everyone would put the speaker in the same place in every room, rather than have it an unknown distance from the rear and side walls. It made sense back in the fifties when loaded horns were essential for high efficiency at low frequencies, in an era of low amplifier power. Back then, systems were mono and so the inability to place the speaker for good imaging was a non-issue. When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. David. |
Convert speaker spikes from quadrupod to tripod
David Looser wrote:
When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. There's a lot less benefit in putting a bass-reflex design in a corner, but you do still get that edge effect and the matter of consistency. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
"Scott Dorsey" wrote in message
... David Looser wrote: When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. There's a lot less benefit in putting a bass-reflex design in a corner, but you do still get that edge effect and the matter of consistency. I don't buy this "consistency" notion. There are still far too many diferences: room size, furnishings and building construction. And that's before we think about differences in the speakers themselves: driver types and sizes, materials used, construction techniques etc. David. |
Convert speaker spikes from quadrupod to tripod
Scott Dorsey wrote:
Laurence Payne wrote: In the second case, why spikes? Why not just the rubber pad? You want to minimize the area of contact with the pad. Plenty of more efficient ways to do that than spikes, mind you, but spikes are usually what people have handy. I've thought that the minimal contact area was important but the smaller you go the higher the pressure so do things remain the same ? Paul P |
Convert speaker spikes from quadrupod to tripod
"David Looser" wrote ...
"Scott Dorsey" wrote... When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. If you had ever seen one, you would know better. Paul Klipsch was (is?) famous for his corner horns. "The Klipschorn is the only speaker in the world that has been in continuous production, relatively unchanged, for over 60 years." http://en.wikipedia.org/wiki/Paul_W_Klipsch But the most impressive corner horn demo I saw was the Cerwin- Vega room at an AES convention in LA in the 1970s. They had an "M" cabinet which looked like a largish column speaker. But when positioned just right facing into the corner, it would flap your pants legs at 20 ft. This page has a drawing of the appliation... http://www.in70mm.com/news/2007/sens...ance/index.htm at the bottom of the page. C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. And other rumors that the JBL demos in another room down the hall, were reproducing such realistic gunshot sounds (thanks to their 075 ring radiator tweeters, aka. the "acoustic laser") that the LAPD was called out to investigate. |
Convert speaker spikes from quadrupod to tripod
"Keith G" wrote ...
"Laurence Payne"wrote ... "Brian Gaff"wrote: I think the reason for four was health and safety actually, harder to wobble them over. By audiophile reasoning, would just ONE spike, perfectly balanced, be the ideal? :-) What do you mean by 'audiophile'...??? Perhaps he misspelled "audiophool". |
Convert speaker spikes from quadrupod to tripod
Scott Dorsey wrote:
David Looser wrote: When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. There's a lot less benefit in putting a bass-reflex design in a corner, but you do still get that edge effect and the matter of consistency. Ime it is about the same 8 dB and they are worth having because the boost from a corner is the smoothest available, also it fits a traditional tone control very well and it is easy to get some degree of perceived linearisation. With my current 4 way it is just a matter of overall bass unit(s) drive level to get a reasonable tonal balance. --scott Kind regards Peter Larsen |
Convert speaker spikes from quadrupod to tripod
"Laurence Payne" wrote ...
Reading at face value, that reply states that spikes either couple or decouple the speaker from what it's standing on. Depending on which you WANTED them to do. This can't be right. What DID you mean? Like many audiophool gimmics, it does what you *want* it to do. It doesn't have to abide by the laws of physics (or economics or common sense). That's the beauty of it. |
Convert speaker spikes from quadrupod to tripod
"Richard Crowley" wrote in message
... "David Looser" wrote ... "Scott Dorsey" wrote... When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. If you had ever seen one, you would know better. Did you bother to read the thread before posting that response? I thought not. I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. David. |
Convert speaker spikes from quadrupod to tripod
James wrote:
My speakers have four spikes beneath them which makes it a pain to move the speakers even slightly as the length of at least one spike has to be adjusted to make all four rest on/in the floor. (The floor is solid - maybe concrete - and not wood.) Anyone heard of a kit to convert four spikes to three? It would have to fit beneath the existing arrangement as I don't want to modify the speakers (which are Dynaudio Audience 62 floorstanders). I'm thinking of something like a heavy duty plate with four solid fittings above and three below. I suppose an alteration to the sound is inevitable but would avoid scrap the idea if it has too much effect. An alternative is to put paving slabs on top of the carpet beneath the speakers. They should be heavy enough to not move and also present a more uniform surface for the speakers though even that would not be perfect. The slight problem here is the slabs sold by the local stores are fairly lightweight. Why don't chairs have three legs? Tractors had three legs and they fell over easily. Maybe they still do. If you must use a tripod, put the single leg at the back, otherwise the speaker will tip over if you brake mid-corner. You can race a Morgan, but not a Reliant, unless you're daft. At least when it falls over the chances are that it'll be driver-side up, so a cone won't get spiked by the corner of the coffee table. If you had a four-to-three adaptor platform, then every time you moved a speaker, you would need to lift it off its platform, then move the platform, then lift the speaker back onto it. That would surely take just as much time and effort as adjusting a leg? A flat stone could be more or less wobbly than four imperfectly adjusted legs unless it's a lot wider, in which case it might still be a bit wobbly and someone's bound to trip and/or stub a toe on it, to boot, especially if you keep moving it around. Anyway, if it's big and heavy then it's hard to move, so how's that easier than adjusting a leg or two? If your floor is lumpy and you use a tripod, the chances are that your speakers won't be upright. You should put up with the need for adjustment. Manufacturers of speakers (and cars) have generally found the best compromise. OTOH, perhaps an adaptor platform would make a plausible audiophool accessory? Ian |
Convert speaker spikes from quadrupod to tripod
David Looser wrote:
"Scott Dorsey" wrote in message David Looser wrote: When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. There's a lot less benefit in putting a bass-reflex design in a corner, but you do still get that edge effect and the matter of consistency. I don't buy this "consistency" notion. There are still far too many diferences: room size, furnishings and building construction. And that's before we think about differences in the speakers themselves: driver types and sizes, materials used, construction techniques etc. Yup, that's true, but the number one thing that determines the low end response (outside of the loudspeaker itself) is the boundary effect. The corner horn controls that. Now, things like standing waves in the room are still very, very significant and corner placement doesn't do anything to reduce that; if anything it can actually make some modes worse. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
In article ,
Keith G wrote: Since it's impossible to make a totally rigid speaker cabinet some makers take into account any 'output' from the cabinet itself. Think the first to do this was the Spendor BC1. Which was designed to be mounted on an open stand about 9" high. Adding mass to the cabinet - like putting books on top - would negate the design theory. The Rogers 'BBC Studio Monitors' I had here a while back were 'thinwall/resonating' types and sounded very good indeed, Probably the same family as the BC1 - from an original BBC design study. apart from the rasping bass unit I couldn't cure - without spending a lot of money and maybe changing the speakers characteristics too much, in any case.... I suppose you tried inverting the driver? -- *Few women admit their age; fewer men act it. Dave Plowman London SW To e-mail, change noise into sound. |
Convert speaker spikes from quadrupod to tripod
Richard Crowley wrote:
C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. Julian Hirsch tested it for stereo review, "the only result was a very loud noise, no harm to the speaker" There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. And other rumors that the JBL demos in another room down the hall, were reproducing such realistic gunshot sounds (thanks to their 075 ring radiator tweeters, aka. the "acoustic laser") that the LAPD was called out to investigate. Kind regards Peter Larsen |
Convert speaker spikes from quadrupod to tripod
Peter Larsen wrote:
Richard Crowley wrote: C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. Julian Hirsch tested it for stereo review, "the only result was a very loud noise, no harm to the speaker" Was any of that noise actually at 60 Hz, though, or was it all 120, 180, etc.? There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. And other rumors that the JBL demos in another room down the hall, were reproducing such realistic gunshot sounds (thanks to their 075 ring radiator tweeters, aka. the "acoustic laser") that the LAPD was called out to investigate. I recall an incident with a falling chandelier in the Ritz-Carlton some time around then.... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
In article , "David Looser" wrote:
"Richard Crowley" wrote in message ... "David Looser" wrote ... "Scott Dorsey" wrote... When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. If you had ever seen one, you would know better. Did you bother to read the thread before posting that response? I thought not. I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. OK, near the end of Speaker Builder magazine, and in Audio Express, a fellow was putting ports or "bass reflex" into his horns to get improved performance. So it might be either or both. greg |
Convert speaker spikes from quadrupod to tripod
Scott Dorsey wrote:
Peter Larsen wrote: Richard Crowley wrote: C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. Julian Hirsch tested it for stereo review, "the only result was a very loud noise, no harm to the speaker" Was any of that noise actually at 60 Hz, though, or was it all 120, 180, etc.? This is something I read in a borrowed magazine in 1978-ish - do not expect too much detail, what he tested was whether the subwoofer in question would survive being connected to a 115 volt outlet as claimed and so it did. Kind regards Peter Larsen |
Convert speaker spikes from quadrupod to tripod
Peter Larsen wrote:
Richard Crowley wrote: C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. Julian Hirsch tested it for stereo review, "the only result was a very loud noise, no harm to the speaker" I heard that Bose fitted a light bulb in series with the drivers (inside the cabinet) to protect them, and to allow the 'mains demo'. Don't know how true it is though. -- Eiron. |
Convert speaker spikes from quadrupod to tripod
"Richard Crowley" wrote in message
C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. I believe that there are a number of extant modern woofers that can survive this treatment for at least a little while without tricks. 120 volts is the same as 1,800 watts into 8 ohms, which is not an unbelievable amount of power by modern standards. On the tricks side, a woofer with a 60.0 Hz resonance would not absorb *that* much power, given that its impedance at 60 Hz might be as high as 30 ohms or more, and only 4 amps (480 watts) or less would need to be dissipated in the voice coil. Also, a woofer with a 16 ohm voice could would need to absorb *only* 900 watts. A mere pittance! ;-) |
Convert speaker spikes from quadrupod to tripod
"Scott Dorsey" wrote in message
Laurence Payne wrote: On 24 Aug 2009 10:52:05 -0400, (Scott Dorsey) wrote: The sort of reasoning that puts spikes on speakers but doesn't really know why. Some say it's to "couple". Others to "decouple". What do you think they're for? You can do either... you can couple the speaker to a huge mass, or you can decouple it from all (possibly resonant) masses. Either method works, and you can measure whether it's working or not (or you can just put your hand on the floor and feel if it's vibrating). Reading at face value, that reply states that spikes either couple or decouple the speaker from what it's standing on. Depending on which you WANTED them to do. This can't be right. What DID you mean? It depends on what you do with the spikes and where you place them. The original intention was to couple the speaker through a carpet to a solid floor, so the floor and the speaker move as a system. But they can also be used with a flexible material like a rubber pad to decouple the speakers from the floor. --scott I've ever heard spike claimed to be the mechanical equivalent of diodes... ....but audiophools say a lot of crazy things. Driver moving mass is usually much less than 100 grams, but can be a 400 grams for some low-efficiency subwoofers. If the woofer is attached to a substantial cabinet, the actual motion of the speaker enclosure due to cone motion will be highly damped by simple mass loading to the point where the energy thus radiated is trivial. In general, the vibrations radiated by the cone are by far the most important effect of the speaker, which is according to the basic design. ;-) The proof of the pudding is to suspend the speaker in the almost same location by means of fishline suspended from the ceiling which gives a very strong decoupling effect. In actual tests, the speaker sounds the same. |
Convert speaker spikes from quadrupod to tripod
On Mon, 24 Aug 2009 15:58:04 -0400, "Arny Krueger"
wrote: "Richard Crowley" wrote in message C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. I believe that there are a number of extant modern woofers that can survive this treatment for at least a little while without tricks. 120 volts is the same as 1,800 watts into 8 ohms, which is not an unbelievable amount of power by modern standards. On the tricks side, a woofer with a 60.0 Hz resonance would not absorb *that* much power, given that its impedance at 60 Hz might be as high as 30 ohms or more, and only 4 amps (480 watts) or less would need to be dissipated in the voice coil. Also, a woofer with a 16 ohm voice could would need to absorb *only* 900 watts. A mere pittance! ;-) Mmmm.... Don't try it over here in England. d |
Convert speaker spikes from quadrupod to tripod
David Looser wrote:
"Richard Crowley" wrote ... "David Looser" wrote ... "Scott Dorsey" wrote... When stereo came in, corner horns went away. It wasn't a horn, it was a bass-reflex. If you had ever seen one, you would know better. Did you bother to read the thread before posting that response? I thought not. I did read the thread. It appears to be talking about the classic Klipsch corner. You can go back and review it if you're confused. I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. I guess we don't know which corner speaker *you're* talking about, then. |
Convert speaker spikes from quadrupod to tripod
"Laurence Payne" wrote in message ... On Mon, 24 Aug 2009 16:49:28 +0100, "David Looser" wrote: At one time there was a fad for mounting speakers as far into room corners as possible. My granddad, who was something of a "HiFi" enthusiast in the 1950s built a speaker cabinet which used the walls and floor as part of the cabinet. I seem to remember that a barrow-load of sand was part of it as well. Yup. And it probably got very loud with only a few watts input. If we were prepared to let our speakers take up rather more space, speaker design (and amp. power) could be very different :-) Still is for a lot of people who prefer low power amp+efficient speakers to *powerhouse* arcwelder+ironing board setups.... |
Convert speaker spikes from quadrupod to tripod
"Dave Plowman (News)" wrote in message ... In article , Keith G wrote: Since it's impossible to make a totally rigid speaker cabinet some makers take into account any 'output' from the cabinet itself. Think the first to do this was the Spendor BC1. Which was designed to be mounted on an open stand about 9" high. Adding mass to the cabinet - like putting books on top - would negate the design theory. The Rogers 'BBC Studio Monitors' I had here a while back were 'thinwall/resonating' types and sounded very good indeed, Probably the same family as the BC1 - from an original BBC design study. apart from the rasping bass unit I couldn't cure - without spending a lot of money and maybe changing the speakers characteristics too much, in any case.... I suppose you tried inverting the driver? Sure - first port of call after turning the whole box upside down; then I tried all sorts of fiddling about before I spoke to DK Loudspeakers: http://www.moirac.adsl24.co.uk/showntell/DSCN1476.JPG |
Convert speaker spikes from quadrupod to tripod
In article ,
Eiron wrote: Peter Larsen wrote: Richard Crowley wrote: C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. Julian Hirsch tested it for stereo review, "the only result was a very loud noise, no harm to the speaker" I heard that Bose fitted a light bulb in series with the drivers (inside the cabinet) to protect them, and to allow the 'mains demo'. Don't know how true it is though. The Bose 901 doesn't do the light-bulb trick (although it IS a cool trick in some ways). However, if you do an impedance plot of the 901, you'll find it's something like 120 ohms at 60 Hz. This means if you actually plug it into a 120V line, you get P=V^2/R= 120 watts of power actually going into the speakers, which isn't enough to hurt them. That is, what you are demonstrating is mostly how inefficient the speakers are at low frequencies..... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Convert speaker spikes from quadrupod to tripod
"Laurence Payne" wrote in message ... On Mon, 24 Aug 2009 17:07:49 +0100, "Keith G" wrote: (I remember once I got someone to listen with his eyes shut while I slowly rotated one speaker until it was facing the wall - he had no idea what was going on and said the sound was unaffected throughout!! ;-) Yes, the Critical Distance for a given room/speaker combination is often closer than you think! In PA applications sometimes it's practically impossible to place the audience inside it. Where's your hi-fi listening "sweet spot" in relation to the CD? In any given room, the same for all speakers or not? When recording, I'm used to monitoring well inside, but checking a mix from WAY outside - like in the next room with the door shut! In normal use I don't go for all this 'sweet spot' malarkey - I listen to most of my music through the doorway from the next room when I'm not listening to the setup on this computer! Anyway, a little while ago I was prompted to make a couple of (mono) microphone recordings of the SET/Lothers with my toyshop ribbon (haven't done it for ages) thus: http://www.moirac.adsl24.co.uk/shown...ibbonSetup.jpg (Note the dressing gown hanging behind it to soak up the 'backdraft'...) Here's a couple of very dirty extracts, complete with hiss, hum, the 'needle down' bang and even the sound of me closing the door, to give you an approximate *recorded* idea of what I like soundwise: http://www.moirac.adsl24.co.uk/shown...phtExtract.mp3 http://www.moirac.adsl24.co.uk/shown...htExtract2.mp3 |
Convert speaker spikes from quadrupod to tripod
"GregS" wrote in message
... In article , "David Looser" wrote: I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. OK, near the end of Speaker Builder magazine, and in Audio Express, a fellow was putting ports or "bass reflex" into his horns to get improved performance. So it might be either or both. I wonder why it is that people who have never seen the speaker I'm talking about, indeed know nothing about it beyond what I've told them, still insist on trying to tell me what it "might be"? This wasn't a horn with a port in it, it was a bass-reflex, OK? David. |
Convert speaker spikes from quadrupod to tripod
"Richard Crowley" wrote in message
. .. I did read the thread. It appears to be talking about the classic Klipsch corner. Actually the thread is about spikes, note the thread title. *One person* misunderstood what I was talking about and mentioned corner horns. That hardly makes this a thread about "the classic Klipsch corner". You can go back and review it if you're confused. I'm not confused - you are. Clearly, contrary to your assertion above, you did *not* read this thread before posting! I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. I guess we don't know which corner speaker *you're* talking about, then. No you don't, as I told you. David. |
Convert speaker spikes from quadrupod to tripod
David Looser wrote:
"GregS" wrote in message ... In article , "David Looser" wrote: I did see the corner speaker *I'm* talking about, which is more than you have. And it was a bass-reflex. OK, near the end of Speaker Builder magazine, and in Audio Express, a fellow was putting ports or "bass reflex" into his horns to get improved performance. So it might be either or both. I wonder why it is that people who have never seen the speaker I'm talking about, indeed know nothing about it beyond what I've told them, still insist on trying to tell me what it "might be"? This wasn't a horn with a port in it, it was a bass-reflex, OK? Maybe they thought you were talking generally about speakers in corners rather than the specific one which your grandfather built. -- Eiron. |
Convert speaker spikes from quadrupod to tripod
"Don Pearce" wrote in message
news:4a92f6a4.1781369140@localhost On Mon, 24 Aug 2009 15:58:04 -0400, "Arny Krueger" wrote: "Richard Crowley" wrote in message C-W were also showing a 12-inch(?) driver which they would plug directly into the 120V power mains outlet in the hotel room. There were rumors that C-W cracked some plaster and had to pay the hotel for repairs. I believe that there are a number of extant modern woofers that can survive this treatment for at least a little while without tricks. 120 volts is the same as 1,800 watts into 8 ohms, which is not an unbelievable amount of power by modern standards. On the tricks side, a woofer with a 60.0 Hz resonance would not absorb *that* much power, given that its impedance at 60 Hz might be as high as 30 ohms or more, and only 4 amps (480 watts) or less would need to be dissipated in the voice coil. Also, a woofer with a 16 ohm voice could would need to absorb *only* 900 watts. A mere pittance! ;-) Mmmm.... Don't try it over here in England. Yup - 230 volts, 50 Hz. |
Convert speaker spikes from quadrupod to tripod
"Eiron" wrote
Maybe they thought you were talking generally about speakers in corners rather than the specific one which your grandfather built. Scott replied as though corner speakers could only be horns, fair enough if that's the only sorts he's met. I simply pointed out that the one I was talking about was a bass-reflex. But then Richard Crowley crashed in with "If you had ever seen one, you would know better", clearly indicating that he had no idea what the point of my comment had been, or indeed on the flow of thread up to that point. Then GregS comes in with "So it might be either or both" when it is clear from the context that "it" is the speaker I was talking about. Yes I get ****ed-off when people tell me that I would "know better" simply because they are incapable of following a thread! David. |
Convert speaker spikes from quadrupod to tripod
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Convert speaker spikes from quadrupod to tripod
On Mon, 24 Aug 2009 21:53:42 +0100, "Keith G"
wrote: In normal use I don't go for all this 'sweet spot' malarkey - I listen to most of my music through the doorway from the next room when I'm not listening to the setup on this computer! Oh sure, me too. Unless I'm working, I'm listening to the music not the equipment. Or just enjoying a pleasant background noise. But just now and again the BBC pump out something good and I fancy wallowing in a bit of stereo image. So I need to know where the sweet spot IS :-) |
Convert speaker spikes from quadrupod to tripod
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