aussiemark Posted November 20, 2007 Share Posted November 20, 2007 DOES ANYONE HAVE AN OPINION ON WHICH WOULD WORK BEST WITH THE RF 7'S ? A ROTEL RB 1080 (2 X 200 W ) OR 2 RB 1070'S ( 2 X 130 W ) BRIDGED TOGETHER . I WAS JUST ABOUT TO BUY THE 1080 WHEN ADVISED ( by a rotel dealer ) THAT THE 2ND OPTION WOULD SOUND MUCH BETTER . I DONT TRUST HIM , I TRUST THE FORUM FOR INFO. THANKS Quote Link to comment Share on other sites More sharing options...
leok Posted November 21, 2007 Share Posted November 21, 2007 Regardless of how much power you think you need or want, the distortion level of the amp at low power (1 Watt and lower) has a lot to do with how natural and un-grainy an efficient speaker like the RF-7 will sound. It could be the dealer is suggesting the amp with lower low power distortion. Can you compare vocals on both? One may exaggerate sibalances ("s" sound) more than the other, possibly to the point of being a problem. Leo Quote Link to comment Share on other sites More sharing options...
Bill H. Posted November 21, 2007 Share Posted November 21, 2007 As Leok pointed out, listen first. Next point is Budget............can you afford the extra expense for the improved sound? Let us know what you end up doing. Quote Link to comment Share on other sites More sharing options...
Trooper Posted November 21, 2007 Share Posted November 21, 2007 All things being equal (which comparing two amps from the same manufacturer is as close as you can get) the non-bridged solution will always be superior. The bridged amp will have higher distortion and lower damping factor. Quote Link to comment Share on other sites More sharing options...
aussiemark Posted November 21, 2007 Author Share Posted November 21, 2007 The bottom line for me is which option will get the best out of the 7's .In Sydney the RB 1080 goes for $1550 whilst the RB 1070 go for $900 . He will do 2 1070's for $1500 as he insists it will provide superior results . I will do an A / B comparison but the distortion issue with bridging 2 anmps concerns me more than the increase in power by doing the same. Quote Link to comment Share on other sites More sharing options...
leok Posted November 21, 2007 Share Posted November 21, 2007 Gee, if the 2 smaller amps bridged are supposed to be better, one of them alone might be really great. Over 100W into the RF-7 is pretty serious (I'm using two 3.5W mono amps into my RF-7s right now, but as I always say, I don't listen real loud). I'd compare the two amps (RB 1080 vs RB 1070) without bridging the smaller one. I suspect you're a bit tied up with the Watts and should be listening to the sound. Leo Quote Link to comment Share on other sites More sharing options...
aussiemark Posted November 22, 2007 Author Share Posted November 22, 2007 I think that is a valid point Leo. I will do an A / B comparison without being captivated by stats . The bottom line as you say mate is the sound not the specs.Thanks Leo the 1080 looks the short priced favorite Quote Link to comment Share on other sites More sharing options...
DrWho Posted November 22, 2007 Share Posted November 22, 2007 Bridging any amplifier increases the distortion of the amp by 6dB...and for what? 6dB louder when you crank it up all the way? I think bridging doubles the output impedance too (which means half the damping). I've not heard either amp, but I have very little doubt that the unbridged amp will sound better. Quote Link to comment Share on other sites More sharing options...
Marvel Posted November 22, 2007 Share Posted November 22, 2007 The 1080 is listed as having .01% lower THD than the 1070 at 1 watt per channel output. .02 vs .03 I would still go with the single stereo amp, but your own ears will really have to decide. The 1070 @ $900 might be all you need. Bruce Quote Link to comment Share on other sites More sharing options...
aussiemark Posted November 22, 2007 Author Share Posted November 22, 2007 Thanks for all the information guys but tell me then what is the motivation for bridging amps together bearing in mind the distortion issue ? Quote Link to comment Share on other sites More sharing options...
leok Posted November 23, 2007 Share Posted November 23, 2007 The only advantage I can think of is flexibility for a range of power requirement situations, with low distortion not being the highest priority. Leo Quote Link to comment Share on other sites More sharing options...
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