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Question re matching separates | Sensitivity & Impedance - Bi amping
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<blockquote data-quote="handsome" data-source="post: 1134718" data-attributes="member: 772"><p>Apologies I was assuming both amps were of the same wattage - if so you would need approximately twice the signal into amp A compared to that into amp B for the same amount of power out of both. So 6dB of <em>voltage</em> gain (x2) into B or -6dB of attenuation into A. 50V output is almost certainly a valve preamp (although could be one of the T&A high voltage preamps) but we only need 2.3V max here so max output level is not a concern but it is cool for bragging rights and impressing certain women. You want to match the levels of the two amps. A 200k resistor in series with Amp A input will work - solder said resistors into some cheap RCA plugs and add to one end of a cheap Y-cable and try it out. It is far from ideal as thats a lot of resistance to add to an amp input - 200k input resistance seems to imply a valve power amp? - and you might get some HF loss as a result. But if you stick with the cheap bits I mentioned earlier (women included) you’ll at least get an idea as to what biamping would sound like</p></blockquote><p></p>
[QUOTE="handsome, post: 1134718, member: 772"] Apologies I was assuming both amps were of the same wattage - if so you would need approximately twice the signal into amp A compared to that into amp B for the same amount of power out of both. So 6dB of [I]voltage[/I] gain (x2) into B or -6dB of attenuation into A. 50V output is almost certainly a valve preamp (although could be one of the T&A high voltage preamps) but we only need 2.3V max here so max output level is not a concern but it is cool for bragging rights and impressing certain women. You want to match the levels of the two amps. A 200k resistor in series with Amp A input will work - solder said resistors into some cheap RCA plugs and add to one end of a cheap Y-cable and try it out. It is far from ideal as thats a lot of resistance to add to an amp input - 200k input resistance seems to imply a valve power amp? - and you might get some HF loss as a result. But if you stick with the cheap bits I mentioned earlier (women included) you’ll at least get an idea as to what biamping would sound like [/QUOTE]
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Question re matching separates | Sensitivity & Impedance - Bi amping
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