If all channels work..$1k is ideal....I got mine around that price and have been satisfied with my purchase. Your 804's will love you.
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My system is a mix at the moment. Mostly 2 channel, but still go to Home Theater from time to time especially for a few choice DVD concerts. My B&K drives my other external speakers via the Pioneer Elite SSP..Side surrounds, Center Channel and my other external speakers throughout house and outdoors via a speaker selector too...Currently got a Coda Integrated that runs my Front L & R speakers for the necessary power and drive plus its able to be bypassed for HT use.
You can Bi-amp but I don't think you will want to when you realize the ability of the B&K to drive your L&R 804 B&Ws plus your center and even your rear channels. You can bi-wire, but I would not suggest it, put your jumpsers in for the speaker terminals and run single wires to and fro....
I think $1000.00 is just about right but a "minty" 200.7 may bring in $1200.00. As you probably know, gear prices are all over the board these days. The 200.7 is a very nice amp IMO. I have owned B&K mostly for the last 4 to 5 years and have been mostly satisfied. I recently sold my B&K amps and am running (2) Acurus A200FIVE's with my 5.2 Klipsch Reference setup. Considering selling one of my Acurus 5-channels and running just one if I can't find the right 2-channel Acurus. If you are interested in the A200FIVE(very minty), let me know and I will list it here on A-gon for less than the B&K 200.7.
I have found no sonic differences in the bi-wire mode...As long as you have good connection between your binding posts, jump them with your jump plates or wire. I have found a good sonic difference when I bi-amped my B&W's and I would consider that avenue with your extra connections to your main L & R.
B&K is out of business, so repairs can be an issue. I think some former employee(s) are doing service, but I have not seen anything about that recently.
I have a 200.7 for a home theater and it is a real powerhouse. However, it can be bright for 2 channel music. I believe the 804's can also tend to be bright, so it might not make a great match for 2 channel music. But, the brightness can be an asset for movies, if you like big explosions.
I also have an ATI 1806 which I actually prefer to the B&K. It does not have balanced inputs and has 20 watts less power (which is pretty meaningless). I think a 5 channel 1805 should be around $1,000.
I would also look at Parasound. You can find them in your price range and I think they are better balanced that the B&K, although I have never owned one. Maybe something like a HCA 2205.
Rotel are also available, although I would stay away from them. There are better options at the price.
"Do you like the sound better than the b&k you used to use?"
Overall with my Klipsch Reference RF-63's, I do like the sound better than my with my B&K's. More midbass punch, and really detailed in the highs. IMO, Acurus amps(2nd generation)are spot on neutral compared to the B&K's which have a "warmish" tone. With my Klipsh Heritage speakers, I lean toward the B&K's. If your B&W's have a brighter signature, I think either would work but maybe the B&K will match better.
Take a look at the review of the xpa 5 in Stereophile. There is a link on the Emotiva web page for the amp. It was written by Kal Rubinson. He is a good reviewer and not prone to heap praise on everything he reviews. He compares it to a Bryston, which is a nice amp. I think it is also a Stereophile "B" Recommended Product. Emotiva has a forum on their site. Also search here for comments. Emotiva gets a lot of praise. It also has free shipping and a 30 day return policy, although I am not sure how much the shipping costs end up being if you ship it back. Again, I have no experience with it, but it does seem to be pretty popular.
Pretty much any of the amps you are looking at will do a brief 3 ohm. Look at the power rating at 4 ohm versus 8 ohm for an idea of their ability to go low. Ideally they should "double down" which means their rating is twice at much at 4 ohm as at 8 ohm. Most amps in this price range will not do that but it does give an idea of power reserve.
The Emotiva amps have high gain, something like 31 dB, which may be a problem if you pre-amp also has high gain.
From my understanding, the Anthem P5 Statement is in another class than the 200.7 and A200FIVE, but also in a completely different price bracket at $5000.00++. I am sure the P5 will handle any load any speaker can throw at it. The B&K, Acurus, and Anthem are all very good amps in their price points. IMO, if the 804's have a tendency to sound bright, maybe the B&K with it's warmish tone and somewhat rolled off highs is the better match. Just my opinion.
When I go look at a piece of gear, I request the seller let me open up the hood so I can look for burn marks, capacitor leaks, and solder joint breaches. I test each channel with a small speaker that I bring along with me.
No worries about rated power vs speaker power rating, unless you get really stupid crazy with the volume knob. Set a max power on volume and max volume on your preamp and eliminate all worries.
Willand - just shows that synergy between amp and speakers is important. On my Sonus Faber Grand Piano and especially on my Cremona the 200.7 was just too harsh at anything other than modest volume. Went to a Levinson 432 and solved the problem, although as a very different price point. I just wanted the OP to be aware of my experience. He is looking at a Anthem now, which I think will be a step up from the B&K.
I do not see a max volume setting in the manual for your Pioneer, other than the settings to balance the 6 channels. But, as long as you keep the volume down, you will be fine. I have a 400 watt amp driving :200 watt" speakers with no issue using a Yamaha receiver. It will be way to loud long before you get to the limit of the speaker.
One thing you do need to test is if the overall gain is so large that you hardly get to move the volume level above the lowest setting. But, most receivers have pretty good control at the low level settings of the volume knob.
Good luck. The Anthem should be a good stop up from the other options.