Have you experimented with speaker placement and room acoustics to a great extent ? Using bi-polar speakers can make placement FAR more critical than if one were using "standard" front-firing models. If you have complete confidence that you have exhausted speaker placement / room treatment options, then i would possibly look into replacing components.
Having said that, i own a Sunfire 300, Sunfire Signature 600, Sunfire Cinema Grand and a Sunfire Cinema Grand Signature. I am currently using the two channel Signature ( factory modified to "Apogee" status ) for the mains in my HT system and the 5 channel Signature for the center, surrounds and subs. The standard Cinema Grand is over at my Dad's house as it sounded much better than his previous amp. The 2 channel Sunfire ( 300 / 600 ) is currently not in use.
As such, i would say that i'm pretty familiar with these amps. Given a high quality signal, i think that they are quite reasonable in performance and excel at driving tough loads. If you want to raise the roof on a regular basis, they will do that all day long and never break a sweat. However, I would not call them extremely detailed or airy sounding and they do lack the last level of "black background" that can be found in some other amps. Bass can come across as being slightly lean and lacking slam when compared to amps like Krell's, the larger Perreaux's, etc.. but is very well controlled. While the above sounds like many "mid-fi" amps, i do think that they sound better ( by a pretty wide margin ) than Adcom, B&K, etc... products. The Sunfire has a certain sense of ease and open-ness that i find lacking in "mid-fi" and some "high end" amps with a bit more refinement all the way around. I do not know how it would compare with your Bryston 4B-ST in your system, but i am 100% certain it would be a very different presentation. Whether or not you would like it would be a matter of personal preference and system synergy. Sean
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Having said that, i own a Sunfire 300, Sunfire Signature 600, Sunfire Cinema Grand and a Sunfire Cinema Grand Signature. I am currently using the two channel Signature ( factory modified to "Apogee" status ) for the mains in my HT system and the 5 channel Signature for the center, surrounds and subs. The standard Cinema Grand is over at my Dad's house as it sounded much better than his previous amp. The 2 channel Sunfire ( 300 / 600 ) is currently not in use.
As such, i would say that i'm pretty familiar with these amps. Given a high quality signal, i think that they are quite reasonable in performance and excel at driving tough loads. If you want to raise the roof on a regular basis, they will do that all day long and never break a sweat. However, I would not call them extremely detailed or airy sounding and they do lack the last level of "black background" that can be found in some other amps. Bass can come across as being slightly lean and lacking slam when compared to amps like Krell's, the larger Perreaux's, etc.. but is very well controlled. While the above sounds like many "mid-fi" amps, i do think that they sound better ( by a pretty wide margin ) than Adcom, B&K, etc... products. The Sunfire has a certain sense of ease and open-ness that i find lacking in "mid-fi" and some "high end" amps with a bit more refinement all the way around. I do not know how it would compare with your Bryston 4B-ST in your system, but i am 100% certain it would be a very different presentation. Whether or not you would like it would be a matter of personal preference and system synergy. Sean
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