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any advice on good 4 ch amp


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flm09 
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Posted: September 27, 2014 at 1:29 AM / IP Logged  
Also in bridge mode the data sheet always say stable into 4 ohms but they refer to 300x2 not 300x1. What you think?
soundnsecurity 
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Posted: September 27, 2014 at 8:06 AM / IP Logged  
it says 300x2 because you can bridge each set of channels, but you will only be bridging the last pair of channels (channel 3 and 4)and it will give you 300 watts assuming you are talking about the F6, and then that will leave channel 1 and 2 to power your front speakers.
soundnsecurity 
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Posted: September 27, 2014 at 8:25 AM / IP Logged  
flm09 wrote:
I just read pdx spec sheet it seems that bridged for sub it could be 300w into 4 or 2 ohms. Or am I wrong?
no, in bridged mode it will only allow as low as 4 ohms. it seems odd at first but the reason for it is that each set of terminals is actually wired to work together internally. so when you wire a set of 2 ohm speakers to each channel( 2 ohm stereo)or a single 4 ohm speaker in bridged mode, the amp does not see a difference because the amp will total the ohm load from each channel when used in stereo mode. so to the amp two 2 ohm speakers gets wired together internally for a total 4 ohm load at inside the amp.
likewise if you use a set of 4 ohm speakers on each channel then the amp would consider that the same as if you had used a single 8 ohm speaker in bridged mode. its harder to understand the difference with this kind of amp because it produces the same amount of power into each ohm load, but if you look at a more conventional amp whose power goes up and down with the ohm load then it becomes a bit easier to understand whats happening.
flm09 
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Member spacespace
Joined: September 17, 2014
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Posted: September 28, 2014 at 12:16 AM / IP Logged  
soundnsecurity wrote:
flm09 wrote:
I just read pdx spec sheet it seems that bridged for sub it could be 300w into 4 or 2 ohms. Or am I wrong?
no, in bridged mode it will only allow as low as 4 ohms. it seems odd at first but the reason for it is that each set of terminals is actually wired to work together internally. so when you wire a set of 2 ohm speakers to each channel( 2 ohm stereo)or a single 4 ohm speaker in bridged mode, the amp does not see a difference because the amp will total the ohm load from each channel when used in stereo mode. so to the amp two 2 ohm speakers gets wired together internally for a total 4 ohm load at inside the amp.
likewise if you use a set of 4 ohm speakers on each channel then the amp would consider that the same as if you had used a single 8 ohm speaker in bridged mode. its harder to understand the difference with this kind of amp because it produces the same amount of power into each ohm load, but if you look at a more conventional amp whose power goes up and down with the ohm load then it becomes a bit easier to understand whats happening.
Ok got it! Now I am looking for a 2 ch amp and a mono amp. Do you think separate amps are better than one single 3 ch amp?
soundnsecurity 
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Posted: September 28, 2014 at 7:13 AM / IP Logged  
either setup would be just as good as long as the single 3 channel amp was a good match to power both the sub and regular speakers. if the amp you choose has enough power for everything you want powered then id go with it mainly because a single amp will keep your system simple and clean. less chance for something to break and less money you have to spend and less work you have to run.
flm09 
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Posted: September 29, 2014 at 1:00 AM / IP Logged  
soundnsecurity wrote:
either setup would be just as good as long as the single 3 channel amp was a good match to power both the sub and regular speakers. if the amp you choose has enough power for everything you want powered then id go with it mainly because a single amp will keep your system simple and clean. less chance for something to break and less money you have to spend and less work you have to run.
True but now I am limited by my 2ohm subwoofer. Btw is there any two ch A/B in same price range as PDX that has better SQ than PDX?
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