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Speaker level adjustment
My amplifier has two outputs. One is switched, and used for the
speakers in the living room. The other is taken via a separate switch box to speakers in the dining room and kitchen. Originally, the relative sound levels in all three rooms were reasonably matched. However, during a kitchen refit, I had to get rid of the conventional speakers, and fitted a pair of small KEF in-ceiling units. These have a rather lower output level. If I deselect the dining room pair, the kitchen is well enough matched to the living room. As a least cost work-around, it strikes me that I might be able to improve the situation by inserting series resistors in the feed to the dining room. Would this work? Living in a semi, I don't run at particularly high sound levels. Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. |
Speaker level adjustment
"Chris J Dixon" wrote in message ... My amplifier has two outputs. One is switched, and used for the speakers in the living room. The other is taken via a separate switch box to speakers in the dining room and kitchen. Originally, the relative sound levels in all three rooms were reasonably matched. However, during a kitchen refit, I had to get rid of the conventional speakers, and fitted a pair of small KEF in-ceiling units. These have a rather lower output level. If I deselect the dining room pair, the kitchen is well enough matched to the living room. As a least cost work-around, it strikes me that I might be able to improve the situation by inserting series resistors in the feed to the dining room. Would this work? Living in a semi, I don't run at particularly high sound levels. Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. If the dining room application is for background music during meals, then it should work fine by attenuating the 'speakers relative to the others. Unless you know how many dBs you need to attenuate, and can then calculate the series resistance value, you'll be better off getting a loudspeaker volume control as is used in Pubs and Restaurants for just such an application. They're not expensive and it does allow you to make changes easily. This will do it. http://cpc.farnell.com/_/bt936/louds...all/dp/AV01580 It's a transformer-based design (presumably a variable auto-transformer, like a Variac). A bit more expensive than a couple of 5-10 watt resistors, but the extra flexibility is worth-while. S. -- http://audiopages.googlepages.com |
Speaker level adjustment
"Serge Auckland" wrote in message ... "Chris J Dixon" wrote in message ... My amplifier has two outputs. One is switched, and used for the speakers in the living room. The other is taken via a separate switch box to speakers in the dining room and kitchen. Originally, the relative sound levels in all three rooms were reasonably matched. However, during a kitchen refit, I had to get rid of the conventional speakers, and fitted a pair of small KEF in-ceiling units. These have a rather lower output level. If I deselect the dining room pair, the kitchen is well enough matched to the living room. As a least cost work-around, it strikes me that I might be able to improve the situation by inserting series resistors in the feed to the dining room. Would this work? Living in a semi, I don't run at particularly high sound levels. Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. If the dining room application is for background music during meals, then it should work fine by attenuating the 'speakers relative to the others. Unless you know how many dBs you need to attenuate, and can then calculate the series resistance value, you'll be better off getting a loudspeaker volume control as is used in Pubs and Restaurants for just such an application. They're not expensive and it does allow you to make changes easily. This will do it. http://cpc.farnell.com/_/bt936/louds...all/dp/AV01580 It's a transformer-based design (presumably a variable auto-transformer, like a Variac). A bit more expensive than a couple of 5-10 watt resistors, but the extra flexibility is worth-while. S. -- http://audiopages.googlepages.com There is something odd about that part - a pair of audio transformers rated 60W with 20Hz to 20kHz response in package 140mm x 85mm x 45mm - and variable as well - and for £20. Don't expect it to sound very good. Michael Kellett |
Speaker level adjustment
"MK" wrote in message ... "Serge Auckland" wrote in message ... "Chris J Dixon" wrote in message ... My amplifier has two outputs. One is switched, and used for the speakers in the living room. The other is taken via a separate switch box to speakers in the dining room and kitchen. Originally, the relative sound levels in all three rooms were reasonably matched. However, during a kitchen refit, I had to get rid of the conventional speakers, and fitted a pair of small KEF in-ceiling units. These have a rather lower output level. If I deselect the dining room pair, the kitchen is well enough matched to the living room. As a least cost work-around, it strikes me that I might be able to improve the situation by inserting series resistors in the feed to the dining room. Would this work? Living in a semi, I don't run at particularly high sound levels. Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. If the dining room application is for background music during meals, then it should work fine by attenuating the 'speakers relative to the others. Unless you know how many dBs you need to attenuate, and can then calculate the series resistance value, you'll be better off getting a loudspeaker volume control as is used in Pubs and Restaurants for just such an application. They're not expensive and it does allow you to make changes easily. This will do it. http://cpc.farnell.com/_/bt936/louds...all/dp/AV01580 It's a transformer-based design (presumably a variable auto-transformer, like a Variac). A bit more expensive than a couple of 5-10 watt resistors, but the extra flexibility is worth-while. S. -- http://audiopages.googlepages.com There is something odd about that part - a pair of audio transformers rated 60W with 20Hz to 20kHz response in package 140mm x 85mm x 45mm - and variable as well - and for £20. Don't expect it to sound very good. Michael Kellett Yes, but they are most likely auto transformers, and I wouldn't believe the response....they don't quote dB limits or distortion. Remember it's for background music, not listening, so it will be adequate for the job it was designed for. If the OP needs high quality, he will be better off with a pair of active 'speakers and a multi-room system, but that's neither cheap nor simple. S. -- http://audiopages.googlepages.com |
Speaker level adjustment
"MK" wrote in message
http://audiopages.googlepages.com There is something odd about that part - a pair of audio transformers rated 60W with 20Hz to 20kHz response in package 140mm x 85mm x 45mm - and variable as well - and for £20. Don't expect it to sound very good. They never actually have to pass the entire 60 watts, only a fraction of it. And, they have a reputation for not being perfectly flat over the entire range. Face it, with typical extension speakers response down to 80 Hz would probably suffice. |
Speaker level adjustment
"Brian Gaff" wrote in message om... I was just thinking this. I keep thinking saturated core for some reason. Are we sure its not just two wirewound pots as I have in an old QED device? They tend to be noisy when you move them though. Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ They could be, but the CPC site says they are transformer based, so I have assumed they use a tapped autotransformer, like a Variac. S. |
Speaker level adjustment
"Serge Auckland" wrote in
message "Brian Gaff" wrote in message om... I was just thinking this. I keep thinking saturated core for some reason. Are we sure its not just two wirewound pots as I have in an old QED device? They tend to be noisy when you move them though. Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ They could be, but the CPC site says they are transformer based, so I have assumed they use a tapped autotransformer, like a Variac. Right. The transformer is designed to present twice the nominal impedance of the speakers to the amplifer, and uses boot/buck winding configurations to minimize the actual power the transformer needs to handle. |
Speaker level adjustment
"Serge Auckland" This will do it. http://cpc.farnell.com/_/bt936/louds...all/dp/AV01580 It's a transformer-based design (presumably a variable auto-transformer, like a Variac). A bit more expensive than a couple of 5-10 watt resistors, but the extra flexibility is worth-while. ** Do NOT under any circumstances use this device. It is a 100%, guaranteed amplifier DESTROYER ! Attenuators used with solid state hi-fi amplifiers must not be of the auto-transformer type. Seen the damage using them does, many times. Think low frequency core saturation, very low DC resistance. Bad news !!! ...... Phil |
Speaker level adjustment
"Serge Auckland" They could be, but the CPC site says they are transformer based, so I have assumed they use a tapped autotransformer, like a Variac. ** Do NOT under any circumstances use such devices. They are 100%, guaranteed amplifier DESTROYERS ! Attenuators used with solid state hi-fi amplifiers must not be of the auto-transformer type. Seen the damage using them does, many times. Think low frequency core saturation, very low DC resistance. Bad news !!! ...... Phil |
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