2. amps-preamps
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Going Back To A Bi-Amp Setup...Need Advice

I once had my system set up in Bi-Amp mode using a Class D Audio 470c for the woofers on my Revel F52`s and my Rogue Atlas Magnum for the mids and highs and it worked nicely.

After awhile I felt as though I really didn`t need all that power for the listening levels that I like, so I sold the 470 and have been running the speakers full range through the Rogue ever since.

But now, I want to do it again but to my knowledge few amps have adjustable outputs like the Class D Audio did which was pretty useful in dialing it all in.

I want a different flavor this time around to power the woofers otherwise I would just get another 470. 

An amp like the Parasound A21 would work, but I wonder if there is a way to add a outboard volume control so that I`m not forced to only shop for an amp with adjustable outs ??

And also...is a Class D amp (design) a better candidate for this arrangement ??  They have gobs of power and are cool running to boot.
scm
erik_squires
15,690 posts
 
The issue with the Schiit passive is the (relatively) low impedance, only 10 kOhms. Put in parallel with say, 20kOhms of another device and you are looking at a very low impedance.

If you were running a solid state preamp with 2 outputs, no problem. But with either passive or tube, this is an iffy combination.

Best,

E


scm OP
295 posts
 
Thanks guys !
Whats the current thinking on using a Class D amp to power the bass section of speakers that have the ability to bi-amp ?
 
I`m leaning towards something in the 400 watt @ 8 ohm to do the job.
scm OP
295 posts
 
Ok...here`s where I`m at right now.

I need to raise the input impedance of two amps, a subwoofer amp that has 10K input and the other amp that I want to use for the bass section has 12K input. 
 A  buffer seems to be needed, so what`s out there that will do the job and are there any made with two inputs and two outputs ?  
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