TonyD'Amore Posted October 21, 2012 Report Share Posted October 21, 2012 We are talking about input voltage on the RCAs correct? Battery voltage is not part of this question? Quote Link to comment Share on other sites More sharing options...
corona_jeff Posted October 21, 2012 Report Share Posted October 21, 2012 Yes he is talk about RCA input voltage Quote Link to comment Share on other sites More sharing options...
JacobB89 Posted October 21, 2012 Report Share Posted October 21, 2012 (edited) edit jeff beat me to it Edited October 21, 2012 by JacobB89 Quote Big Wheels Are Like G-Strings...Anyone can put them on but it don't mean they look good..... Link to comment Share on other sites More sharing options...
pa-pa-platypus Posted October 21, 2012 Report Share Posted October 21, 2012 Quote This isn't teeball. YOU DO NOT GET A TROPHY JUST BECAUSE YOU SHOW UP. Put the work in and then maybe get the respect when it has been earned 151.6 with single 12 at 41 hz 153.2 with 2 12's at 43 hz power: dd m4 Link to comment Share on other sites More sharing options...
CJ18 Posted October 21, 2012 Author Report Share Posted October 21, 2012 Yes strictly talking about RCA input voltage. Quote Link to comment Share on other sites More sharing options...
mttornquist Posted October 21, 2012 Report Share Posted October 21, 2012 I am interested to see the answer as well! Quote My Build Log: http://www.stevemead...lmost-complete/ Link to comment Share on other sites More sharing options...
08tahoe Posted October 21, 2012 Report Share Posted October 21, 2012 This is an interesting question and I wanna see the answer to this also. Quote Link to comment Share on other sites More sharing options...
TonyD'Amore Posted October 21, 2012 Report Share Posted October 21, 2012 (edited) RCA voltage will have no affect on efficency. Every amplifier reguardless of class has some internal gain. Lets say than an amplifier puts out 50 Vac RMS before clipping. Lets also say that the internal gain on this amplifier is 10. That means that it will take 5Vac of input to drive the amplifier to clippling. ( 5Vac X gain of 10 = 50Vac ) The "gain" control on the amplifier is to "gain up" whatever signal is coming in, up to the 5Vac that is required to drive the amplifier to clipping. Example A: There is only 1Vac input to the amp. We adjust the external gain control to have a gain of 5 to drive the amp to clipping. So the 1Vac coming in goes through the "preamp section" of the amplifier where the gain control gains it up to 5Vac. The signal then goes to the "amplifier" section of the amplifier where it internal gain is 10 so now our amplifier puts out 50Vac. The gain pot on this amp is probably 1/2 way up or so Example B: There is 5Vac input to the amp. We adjust the external gain control to have a gain of 1 to drive the amp to clipping. So the 5Vac coming in goes through the "preamp section" of the amplifier where the gain control does nothing so the signal is still 5Vac. The signal then goes to the "amplifier" section of the amplifier where it internal gain is 10 so now our amplifier puts out 50Vac. The gain pot on this amp is all the way down. Same result, no affect on efficency or power output. The only possible difference between example A and example B would be that B could potentially have a slightly "cleaner" signal since the signal would have less chance of picking up alternator whine or other noises as the signal travels from source unit to amplifier. Edited October 22, 2012 by TonyD'Amore 1 Quote Link to comment Share on other sites More sharing options...
CJ18 Posted October 22, 2012 Author Report Share Posted October 22, 2012 That makes sense. But what could be the reason for the .5db increase with the lower input voltage and gained to match vs the higher input voltage? Also an extra 1500w. Clamped 8500 before(6Vac input), then clamped 10000w after(.35Vac input). Quote Link to comment Share on other sites More sharing options...
alaskanzx5 Posted October 22, 2012 Report Share Posted October 22, 2012 so as it is said a higher input voltage can create a better cleaner signal and with a cleane signal you can potentialy push the subwoofers further and harder with more power with out clipping. then if im reading this right, if the amp was able to except up to a 5 volt input with a 10 volt internal give a 50volt total when correctly set. so a 1 volt input adust right would give 50 volts like your saying and 5 volt adjusted right would still give 50 volts. then if you have a h/u that has 6volt preouts going to this amp that can only take up to a 5 volt preout from the hu without clipping you wont be able to correctly adjust the gain meaning you will clip regardless of the gain setting on the amp? so in the end if you have a cd player with a 6 volt preout and a cd player with a 4 volt pre out and the amp can be set to 50volts with out clipping and has an internal gain of 10 volts the cd player with the 4 volt pre out would be able to allow you to push you equipment to its max with out clipping while the cd player with the 6 volt preout would create more clipping and only hurt the output and sound quality of the system. and if im right distortion hurts your spl score and so with to much voltage coming in from your rca preouts then what the gain setting on the amp can adjust for you will have distortion lowering you spl? Quote t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
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