2. amps-preamps
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Krell amp upgrade question

A little background: I used to drive a full B&W Matrix home theatre system (801s2, 804s1, 805, center HTM) with a combo of Krell KAV 250a x2, and 250a/3 amps. I was very happy with the sound for both stereo and HT, and only had a ground loop issue with the front mains - thought due to long XLR runs (>15ft) and solved with "isolating" XLR plug adapters.
Fast forward to today: I just picked up a gorgeous pair of B&W N800 to replace my Matrix set. I was planning on bridging each 250a as pseudo-monoblocks but then need to decide how to run the rest of the HT. I still need to successfully drive a B&W N HTM-1 center, but the surrounds have become in-ceiling or B&W WP-1.

Options:
- acquire another KAV 250a (very difficult to source)
- bridge 2 channels of the 250a/3 for Center, and acquire another 250a/3 (also difficult to source)
- sell the 250a/3 and replace with a Krell Showcase 5/ other "newer" but less powerful Krell multi-channel amp

Of note: the 250a/3 I currently have may need service as I am noticing crackling during playback - although this may be from source material, and the ground loop is still present - although will most likely be minimally noticed in surround speakers/ can be eliminated with the isolating XLR plug adapters.

It is NOT an option to scrap everything and buy all new amps!
Appreciate thoughtful comments.
doctock993
Post removed 
doctock993 OP
6 posts
 
Per Krell awesome Tech support this morning: "No issue driving < 8 ohm when 250a is bridged."
zd542
5,339 posts
 
"Why is the KSA 250a/3 "definitely better than the Showcase"?"

The KSA has a lot more power. I've heard the showcase strain under loads that the KSA would not. I think it sounds better, as well.
Post removed 
zd542
5,339 posts
 
Just because Krell doesn't print the specs for 2 ohms in the manual, doesn't mean it won't be able to handle the load. I think specs for 2 and 4 ohms are more important to people now because brands like B&W and Martin Logan are more available due to them being sold in places like Best Buy. A typical receiver just won't cut it for those types of speakers, despite their power ratings. But you do have a point about what's printed in the manual. Personally, I would like to see more specs in the manual to avoid confusion. Having owned the amp, I think it will be fine used either bridged or 2 channel.

One thing you can do that should answer some questions, is to run the amp you have bridged into just 1 of your speakers as a test. If the amp has trouble driving the one speaker bridged, you can expect the same results if you get another amp. Also, many people report that bridging a stereo amp lowers the sound quality. Of course, results will vary depending on many factors, but I think its something to keep in mind.

If you do try the single amp bridged, make sure you compare it to just 1 speaker non bridged. It makes the comparison much easier.
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