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In Reply to: It's a signal-noise ratio issue posted by KCHANG on March 7, 2007 at 12:41:00:
The preamp is needed because I listen to records.My preamp will put out a lot more voltage than just the CD player if I use a CD player as an input. Given that should I run 10vac or ??? into said crossover rather than the 2vac a straight CD connection would give? It is not a problem to pad after the crossover in either case. I don't think so well in dB's but I am thinking the standard for pro audio is 7vac in??? If so but I am converting XLR to single ended does that change anything? It is a TDM crossover.
Follow Ups:
Hi Russ,Are you thinking about (1) using the preamp to adjust the volume, in combination with a pad-down after the crossover, or (2) leaving the preamp at a fixed setting (e.g., with a gain of 3.5 for CD) and using another volume control after the crossover? I think the former is likely to have a worse signal-noise ratio than the latter at a normal listening level.
Nevertheless, since a pad-down (a voltage divider or a pot) is fairly easy to make and insert between the crossover and the amp, perhaps you can give the first approach a try and let us know whether you hear an improvement over no pad-down.
Do you have any noise issue now with the active crossover?
Kurt
info on how to properly set up and use the crossover.I'd imagine I'll set the preamp for the normal maximum listening volume (but not so high as to ever have it clip). From there I'd pad down the crossover outputs to match amps/drivers for equal volume (crossover has this feature). If need be, I'd then use a six gang volume pot, after the crossover, to control listening level.
I am new to this whole active crossover stuff. I have been using a borrowed one (that is on the cheap side) as a 2-way at 250 hertz and a passive between mid and high. I haven't noticed any noise problems.
Hi Russ,If you are going to use an anolog crossover, I'd suggest that you don't worry about it unless you actually notice a noise problem. I prefer to put the volume control after the crossover, but if having a preamp before the crossover does not generate objectionable noise there is really nothing to worry about. ;-)
Cheers,
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