Pre amp out put?

[04gtdrop]

If you have two diff headunits, and one has more volts for the pre amp out put for the sub...will it sound better or diff?

I'm looking at two diff models and one puts out 2.2 volts to the pre amp and the other one puts out 5 volts to the pre amp....

I'm wondering, will the one that puts out 5 volts put out more power and make the sub hit harder than the cheaper headunit that only puts out 2,2 volts?

Whats the diff????

Sorry for the lame question...but I just dont know about this kind of stuff....thanks guys

 

[RoadconeTuning]

its just going to have a hotter signal... MOST amps use 2.2v as a standard input but i have an amp that will adjust for up to 5v... you cant go off voltage alone tho... its possible that it has a horrible signal to noise ratio at that voltage so... its your call.

 

[DropTopPony]

Its supposed to have a cleaner signal with the higher volts but like said above if your amps can't handle it then whats the use. My alpine is a 5V output and my JL amps can adjust to handle the input so i'm ok...i guess it just depends on what other parts to your system you are working with.

 

[DTNODYA]

I agree with the above posts but thought I'd add that it is important when actually hooking up the amp, to run good RCA's. Get some monster cables if you have nice stuff if not get some thick ones anyway ... I have had poor sound with cheap ones so I thought I'd throw it out there ....

 

[04gtdrop]

Its supposed to have a cleaner signal with the higher volts but like said above if your amps can't handle it then whats the use. My alpine is a 5V output and my JL amps can adjust to handle the input so i'm ok...i guess it just depends on what other parts to your system you are working with.

Ahh i see. ok, well the headunits im looking at are...the Pioneer 6800 and the pioneer 8900

http://www.crutchfield.com/S-0AI975...ms=130DEHP680&compareitems=130DEHP980&x=8&y=3

And I am running a Earthquake audio 12" sub

Model: MAGMA-12

1500 WattsMax
FS=28Hz
Qms = 9.9846
Qes = 0.4043
Qts = 0.3886
VAS = 5.71Ft3
Xmax = 0.5"
85dB 1W/1M
Revc = 6.78
Levc = 6.3mH @ (1 kHz)
3" Dual Voice coil(2x3.2 ohms)


And a Earthquake Audio 2000 watt amp

Number of channels:
1 / Mono Block
Max power output: 2000 Watts
RMS power 2-ohm: 1000 Watts
RMS power 4-ohm stereo: 500 Watts
Damping factor: >800
Cross over slopes: 24dB/OCT
THD: >0.016
SNR: 104dB
Class: "D" Digital
Speaker connection: 8-Gauge
Recommended
power connection: 4-Gauge
Input type: Independent Low Level RCA
Dimension: 2.375" x 10.125" x 12 "


The amp/sub is running off the stock system right now. And im getting tire of it. I want to upgrade my headunit and door speakers as well.

I'm jus twondering if the more expensive pioneer is worth it or not....do i really need 5 volts for the pre amp or will it be the same as 2.2 volts from the cheaper pioneer?



Pioneer DEH-P6800MP

Vs.

Pioneer DEH-P9800BT ?


What would you guys buy and why ?

 

[Shiroelex]

Hah, with Earthquake, get the 2.2. I'm not a fan of the Earthquake stuff myself. Since it's a D class monoblock amp anyways, the 2.2 would be fine. If I were using an amp for component speakers, I would run the 5v.

Also remember to not run the RCA cables with the power cable. Put one down one side of the car, and one down the other. You can get some noise that way unless you have real expensive twisted pair noise rejection cable. Even with that, I play it safe than sorry and run the RCAs away from any power wires.

 

[damacman]

Lots of bad info in this thread. First and foremost, high voltage preamplifiers are always beneficial over lower voltage ones for numerous reasons:

1. Higher output voltage from your source means that you can turn the gain control down on your amplifier, thereby reducing floor noise - the hissing sound you can get from your speakers when your source is at ZERO on the volume control.

2. Higher output voltage from your source unit also offers greater immunity to induced noise into signal cables running from front to back.

Of equal (or greater) importance to high output voltage is LOW output source impedance. The lowere the output impedance the better. A REALLY good preamp section will offer less than 100 ohms of source output impedance - the lower this number is, the more capable the source will be at driving the preamp section of your amplifier(s). If you had the choice between a 2.2 volt source with 100 ohms of output impedance and a 5 volt source with 1,000 ohms of output impedance, the 2.2 volt source will perform MUCH better.

On cables, a garden hose sized RCA with an old fasioned coaxial design - braided conducter around a center conducter - will most likely result in engine noise being induced into the cable somewhere along its run from your source to amplifier. Conversely, a well designed twisted pair cable will typically be much smaller and "less manly" looking - BUT, it will offer far greater immunity to induced noise.

Finally, running your RCA cable on one side of the vehicle and the power cable on the other is not always a way to guarantee a noise free system. I've seen many a case where just the opposite was necessary. Think about it . . . the chassis of every vehicle serves as the return path for all things electrical - it's in effect a very large power cable. Having said that, I would recommend you run the RCA cable down the center of the vehicle - thereby avoiding OEM electrical harnesses and the power cable to your amplifier.

A little planning on the front side will lead to less headaches after the install.

 

[damacman]

BTW, I found the source output impedance on both units at Pioneer's website. Click here for the info on the 9800 - this deck has a FAR better preamp section than does the 6800:

Pioneer 9800 Specs

 

[04gtdrop]

Wow, Damacman....thanks for all the info. Im a dummy when it comes to car audio.


I was leaning more towards the 9800, but this pretty much makes up my mind. I think I'll just do it and go for the 9800!!!

And I have to ask...Where did you learn so much about car audio????


Thanks
04GTDROP

 

[damacman]

Let's just say, that after 17 years in the car audio business, I thought I make a career out of it.

 

[Red2000GT]

Excellent info damacman.

 

[04gtdrop]

Let's just say, that after 17 years in the car audio business, I thought I make a career out of it.

Haha