posted
Could someone please tell me what does it mean when a head unit have a 4 volt output?Is it better than head units with 2 volt output?Being an SPL competitor,does it matter which head unit to run?
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Paradoxotaur: An imaginary creature that has confused experts for centuries that is said to exist only if you don't believe in it.But,if you do believe it exists,then it doesn't.Tends to haunt students of logic. Posts: 66 | From: West Palm Beach,Fl. | Registered: Oct 2005
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posted
as far as spl goes, most of the time no. if you have a 2 volt max output and your amp gain is 6-.2 volt gain. then at full gain it will only need .2 volts to make the amp put out as much power as it can. if your running more then 1 amp off a low voltage head unit sometimes people will get line drivers. and for daily driving line drivers are nice too. the lower you set your gain and the more voltage you send the amp the cleaner the single will be. when you send a weak signal threw your rcas to the amp then the rca are more likely to take noise from whats surrounding the rca into the amp and putting out noise into your speakers. if you run a higher voltage threw the rca less inductance of noise will occure and give a cleaner signal. so in theory higher voltage output is better, but when it comes to a podium setup with a cheap head unit then you can use a pos head unit maybe 2 volts and just turn the gains up. because once you hit the clipping of the amp the extra voltage is not going to help anyways.
-------------------- Infiniti J30 2 kicker solo x 12s 2 kicker 2500.1 @ 1 ohm wall, 7 cubes, 100 sq port 149.1 DB at 42hz. DiRtY SoUtH DEAF SqUaD Posts: 1361 | From: Columbia, SC | Registered: Jan 2003
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posted
being an SPL competitor, I'd say if you don't know the difference, you're not going to get very loud...
but yes, 4 volts would be better than 2 volts...
its how high the level output from the RCA's is... some amps need higher voltage, and higher is better, because it also means that the slight loss along the RCA cables doesn't matter as much/
quote:Originally posted by Death By Bass: being an SPL competitor, I'd say if you don't know the difference, you're not going to get very loud...
but yes, 4 volts would be better than 2 volts...
its how high the level output from the RCA's is... some amps need higher voltage, and higher is better, because it also means that the slight loss along the RCA cables doesn't matter as much/
i would have to dissagree, with the right tuning of the head unit and amp im sure i would get the exact same score off of a 2 volt head unit as a 4 volt unit
-------------------- Infiniti J30 2 kicker solo x 12s 2 kicker 2500.1 @ 1 ohm wall, 7 cubes, 100 sq port 149.1 DB at 42hz. DiRtY SoUtH DEAF SqUaD Posts: 1361 | From: Columbia, SC | Registered: Jan 2003
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quote:Originally posted by Death By Bass: being an SPL competitor, I'd say if you don't know the difference, you're not going to get very loud...
but yes, 4 volts would be better than 2 volts...
its how high the level output from the RCA's is... some amps need higher voltage, and higher is better, because it also means that the slight loss along the RCA cables doesn't matter as much/
i would have to dissagree, with the right tuning of the head unit and amp im sure i would get the exact same score off of a 2 volt head unit as a 4 volt unit
I said a 4 volt would be better... not louder...
and some amps need like a 2 volt input minimum... alot of headunits don't actually do their rated voltage output on the RCA's either...
quote:Originally posted by Death By Bass: being an SPL competitor, I'd say if you don't know the difference, you're not going to get very loud...
but yes, 4 volts would be better than 2 volts...
its how high the level output from the RCA's is... some amps need higher voltage, and higher is better, because it also means that the slight loss along the RCA cables doesn't matter as much/
HUUHHH?? Dude, read maxxology's reply, hes got it nailed right. It is posslible to overdrive an amp through RCA inputs with too much voltage. Ive done it with a PPI 2360 amp. RCA voltage doesnt make that much difference in SPL output. RCA voltage does matter if your running 2+ amps off the same RCA line thats where the Line Driver was created for. The kind of voltage your talking about is actual voltage from the alternator, thats where it would make the biggest difference in some amps.
What I like about Line Drivers is, you can turn up the gain on the LD, turn the gains down on the amps and you can push the amps harder with cleaner music signal.
-------------------- Mike Zadler
2003 Usaci 151.2@48hz (AudioControl 170) 2003 AS3: 149.6@39hz (Linx Meter) 2004 S4: 145.2@41hz (TermLab) 2005 M1: 149.3@69hz Retired indefinately. Still into car audio to help others where I can. Posts: 3022 | From: I don't just want to knock over the pins, I WANT TO VIOLATE EM!!!! | Registered: Jun 2000
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posted
more than one amp off the same RCA's is going to make bugger all difference...
my friend had a headunit, with supposid 4 volt preouts, it was an Alpine... he had to have the gain on his amp up full to get enough output from the amp...
posted
i have 2 concepts running off my sub output rca, and a us amps running of my front rca, all off of the head unit no line driver, and i only have my concept(bass amps) gains at a little over 1/2, and i think i can still get the amps into clipping...
-------------------- Infiniti J30 2 kicker solo x 12s 2 kicker 2500.1 @ 1 ohm wall, 7 cubes, 100 sq port 149.1 DB at 42hz. DiRtY SoUtH DEAF SqUaD Posts: 1361 | From: Columbia, SC | Registered: Jan 2003
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posted
and no i do not take the output of the first amp to the second amp. i use rca spliters. even tho i only have the gains matched at 1/2 its still enough for the sub for daily.
-------------------- Infiniti J30 2 kicker solo x 12s 2 kicker 2500.1 @ 1 ohm wall, 7 cubes, 100 sq port 149.1 DB at 42hz. DiRtY SoUtH DEAF SqUaD Posts: 1361 | From: Columbia, SC | Registered: Jan 2003
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posted
also resistance of the rca output is 1 thing that matters about the head unit, most are around 100k ohm, the voltage will not change if you split the rca up to 2 amps, but the resistance will, so both amps will still see 4 volts not 2 volts for each.
-------------------- Infiniti J30 2 kicker solo x 12s 2 kicker 2500.1 @ 1 ohm wall, 7 cubes, 100 sq port 149.1 DB at 42hz. DiRtY SoUtH DEAF SqUaD Posts: 1361 | From: Columbia, SC | Registered: Jan 2003
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My DEH-P8mp has 6 volt sub outputs. The volume maxes out at number "62" on the display.
I had the gains on the collousus maxed, sub output at +2, and the remote bass knob on the amp at 1/3 of the way up. If I turned the radio above "30" the score would stay constant or drop.
So, a 6 volt signal for SPL in my car was unimportant. A 2 volt would suit me just fine...
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