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bridgeable
how can I tell if either of my amps are bridgeable, I want to run a
subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 |
bridgeable
Theo wrote:
how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 and also does anyone know where I can find somewhere to buy a mono power amp IC kit, I have looked in maplins but they only went up to 40w, my sub has two 12" 350w drivers and a low pass filter.. |
bridgeable
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. -- Trevor Wilson www.rageaudio.com.au |
bridgeable
Trevor Wilson wrote:
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? |
bridgeable
Theo wrote:
Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message . co.uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? Just use one channel of the power amp. |
bridgeable
Eiron wrote:
Theo wrote: Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? Just use one channel of the power amp. one side of it? is that safe |
bridgeable
On Sat, 27 Nov 2004 12:03:09 +0000, Theo wrote:
Theo wrote: how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 and also does anyone know where I can find somewhere to buy a mono power amp IC kit, I have looked in maplins but they only went up to 40w, my sub has two 12" 350w drivers and a low pass filter.. How about one of these modules? http://www.bkelec.com/DIY.htm I have one of their old bipolar transistor ones here that my brother built into a sub. It's been running on and off (depending on who could find room for it at the time...) for years! £43-85 incl vat for 100w with a built in power supply can't be bad. -- Mick (no M$ software on here... :-) ) Web: http://www.nascom.info Web: http://projectedsound.tk |
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"mick" wrote
How about one of these modules? http://www.bkelec.com/DIY.htm I have one of their old bipolar transistor ones here that my brother built into a sub. It's been running on and off (depending on who could find room for it at the time...) for years! £43-85 incl vat for 100w with a built in power supply can't be bad. Bloody hell, those modules have been around for YEARS, haven't they?! Specs look a bit... well, for example, the 100W nominal one claims 105W into 8 Ohms (fair enough), but only 115W into 4 Ohms. Krell it ain't. Worse yet, the amp marketed as 1000W is positively cheeky: 8 Ohms: 550W -- HUH? I thought this was meant to be 1000W Cheeky gits. 4 Ohms: 725W 2 Ohms: 1050W Even quartering the load resistance, you get less than a doubling of supplied power. Still, they're cheap so you can't really complain, but I think that given that their 100W amp really does deliver 105W into 8 Ohms, it's a ****ing cheek that you only get 550W from the "1000W" amp, and you need to go down to 2 Ohms to get your 1000W! Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
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Fleetie wrote:
"mick" wrote How about one of these modules? http://www.bkelec.com/DIY.htm I have one of their old bipolar transistor ones here that my brother built into a sub. It's been running on and off (depending on who could find room for it at the time...) for years! £43-85 incl vat for 100w with a built in power supply can't be bad. Bloody hell, those modules have been around for YEARS, haven't they?! Specs look a bit... well, for example, the 100W nominal one claims 105W into 8 Ohms (fair enough), but only 115W into 4 Ohms. Krell it ain't. Worse yet, the amp marketed as 1000W is positively cheeky: 8 Ohms: 550W -- HUH? I thought this was meant to be 1000W Cheeky gits. 4 Ohms: 725W 2 Ohms: 1050W Even quartering the load resistance, you get less than a doubling of supplied power. Still, they're cheap so you can't really complain, but I think that given that their 100W amp really does deliver 105W into 8 Ohms, it's a ****ing cheek that you only get 550W from the "1000W" amp, and you need to go down to 2 Ohms to get your 1000W! Martin any other idea's then martin? i want a mono setup ideally. |
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any other idea's then martin? i want a mono setup ideally.
I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
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Fleetie wrote:
any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter |
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"Theo" theo*+*@*+*letsblowitup*.*com wrote
Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
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Fleetie wrote:
"Theo" theo*+*@*+*letsblowitup*.*com wrote Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin I like it loud, Ive already got 8 speakers. :) |
bridgeable
Theo wrote: how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 Oh My Lord ! ( @ arcensparken.com ! ) Graham p.s. get a clue |
bridgeable
Pooh Bear wrote:
Theo wrote: how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 Oh My Lord ! ( @ arcensparken.com ! ) Graham p.s. get a clue ???? |
bridgeable
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... Fleetie wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin I like it loud, Ive already got 8 speakers. :) **Then look for efficiency. -- Trevor Wilson www.rageaudio.com.au |
bridgeable
Trevor Wilson wrote:
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... Fleetie wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin I like it loud, Ive already got 8 speakers. :) **Then look for efficiency. sorry im clueless at this? |
bridgeable
Theo wrote: Pooh Bear wrote: Theo wrote: how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 Oh My Lord ! ( @ arcensparken.com ! ) Graham p.s. get a clue ???? "Theo" theo*+*@*+*letsblowitup*.*com ^^^^^^^^^^^^^^^ Bridging can be very effective at this if applied incorrectly. Graham |
bridgeable
Theo wrote:
Eiron wrote: Theo wrote: Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? Just use one channel of the power amp. one side of it? is that safe Totally. Graham |
bridgeable
Theo wrote:
Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... Fleetie wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin I like it loud, Ive already got 8 speakers. :) **Then look for efficiency. sorry im clueless at this? Apparently so. All speakers have dB/W ratings. It's not a linear relationship ( decibels are logarithmic ) so it's measured with 1 watt of input ( actually 2.83V for an 8 ohm nominal speaker ). Depending on the kind of speaker/driver that figure may vary anything between say, 85 and around 112 dB ! All for the same power. Graham |
bridgeable
"Theo" theo*+*@*+*letsblowitup*.*com wrote in message . uk... Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... Fleetie wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote Fleetie wrote: any other idea's then martin? i want a mono setup ideally. I'm sure they'll be fine for your application. I mean how many watts do you really need?! Martin I dont know anything about power speccin, the speakers are 2 x 350w bass drivers with a low pass filter Well I dunno. How big is your room and how loud do you like it? Others will need to help you on this. I doubt you need 700W of bass in a domestic setting! 200W ought to be enough at a guess. Martin I like it loud, Ive already got 8 speakers. :) **Then look for efficiency. sorry im clueless at this? **Think of it this way: A speaker with an efficiency of (say) 87dB/W/M, with 100 Watts up it's bum, sounds as loud as a speaker with an efficiency of 90dB/W/M with 50 Watts up it's bum. Likewise, a speaker with 96dB/W/M with 12.5 Watts up it's bum sounds as loud as your 87dB/W/M speaker with 100 Watts. Neat huh? For some reason, my original post disappeared. Here is what I wrote a few days ago: --- how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. --- -- Trevor Wilson www.rageaudio.com.au |
bridgeable
"Trevor Wilson" wrote in message
**All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. These are *the* salient points. There is some wiggle room if you consider how hard you intend to push the resulting bridged configuration. However, its reasonable to think that if you bridge amps, you're going to push them hard. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Exactly. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. A conservative rule. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. I'll defer to practical experience in this regard. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. Given their pricing and visible construction features, no surprise. |
bridgeable
"Pooh Bear" wrote in message ... Theo wrote: Eiron wrote: Theo wrote: Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? Just use one channel of the power amp. one side of it? is that safe Totally. Graham I can seperate my two drivers into L + R, would that be better? |
bridgeable
Theo wrote:
"Pooh Bear" wrote in message ... Theo wrote: Eiron wrote: Theo wrote: Trevor Wilson wrote: "Theo" theo*+*@*+*letsblowitup*.*com wrote in message .uk... how can I tell if either of my amps are bridgeable, I want to run a subwoofer in mono and I have no manuals for either... sherwood AX4103 denon PMA-720 **All amplifiers (save a minute number) are bridgeable. What dictates the success of such an operation are the following: * The MINIMUM impedance of the speaker. * The MINIMUM impedance that the amplifier is rated to drive. Divide the minimum impedance of the speaker (not the average impedance, which is the usually supplied figure) by 2. If that figure is lower than the minimum impedance rating of your amplifier, then you can't do it. Some general rules of thumb (or is that thumbs). * Unless the manufacturer provides specific switching, or bridging adaptors, they should not be bridged. * Very few Denon amps can be successfully bridged into less than 8 Ohm loads. * Since Sherwood amps are generally crap, they cannot be bridged into ANY speaker. whats the best option for driving my sub then? new amp or is there another way? Just use one channel of the power amp. one side of it? is that safe Totally. Graham I can seperate my two drivers into L + R, would that be better? In the same box ? Not really. Mind boggles. Graham |
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