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View Full Version : is there a big difference in the volts of pre-outs?



bang hard
02-28-2005, 11:50 AM
is it better to get a higher volt or a lower volt? thanks

squeak9798
02-28-2005, 11:52 AM
Higher voltage preouts are "better" because they allow you to keep the gain on your amp set to a lower level, possibly decreasing noise. But having the highest preout level possible isn't a life or death situation. If you have no noise in your system with a 2V preout level, then going any higher isn't going to make any difference.

Having low impedence outputs is more important than having a high voltage level.

bang hard
02-28-2005, 11:55 AM
whats low impedence out put's, and how do you no if the hu has them?

bang hard
02-28-2005, 11:58 AM
dose anyone have or know anything about the alpine CDA-9847 HU? i was thinking of get an alpine HU. is this one good, in your opinoin?

squeak9798
02-28-2005, 11:58 AM
whats low impedence out put's, and how do you no if the hu has them?


Preout impedences should be in the owners manual. The lower the better. Some Eclipse HU's, for example, have 55ohm preouts, which is pretty low.

bang hard
02-28-2005, 12:04 PM
is that a good HU? im looking up the pre-out impedences right now. thanks

bang hard
02-28-2005, 12:24 PM
can someone answer my reply? thanks

bang hard
02-28-2005, 12:31 PM
the owners manual says maximum pre-out voltage is 2v/ 10k ohms. is that good?

johnecon2001
02-28-2005, 07:56 PM
thats horrible. 10,000 ohms? vs eclipses 55ohms? you tell me which is better.

squeak9798
02-28-2005, 08:03 PM
you tell me which is better.

Sushi. Sushi is better................






No, those specs aren't that great. But will it work? Yes

00GREENMACHINE
02-28-2005, 08:14 PM
I went from a 4 volt to a 8 volt deck and I could tell a BIG difference. Amps ran so much cooler and still had the output.

bang hard
03-01-2005, 11:11 AM
so that HU isnt that good, everyone tells me to get an alpine?

kronik
03-01-2005, 07:16 PM
so that HU isnt that good, everyone tells me to get an alpine?

Or a Pioneer, or an Eclipse.

syntekz
03-01-2005, 09:40 PM
Just as an FYI, to throw another number out there.
My newly purchased (just last weekend) Alpine CDA-9833 and I believe the CDA-9835 also, have Maximum Pre-Output Voltage of:
4 V/ 10 k ohms

The way everyone is talking I'm regretting my purchase. Those Eclipses are well beyond $300 US though aren't they?

G

forbidden
03-02-2005, 01:29 AM
No, all the new head units from the bottom of the line are 5 volt, 55 ohm preouts until the top two models which are 8 volt, 55 ohm preouts. Well under the $300.00 mark as well.

jerseystyle1
03-02-2005, 10:04 AM
Something else to think about is the maximum input your amp has. Not all amps can except an 8 volt input.

maylar
03-02-2005, 05:29 PM
the owners manual says maximum pre-out voltage is 2v/ 10k ohms. is that good?

It's fine. Although 2 V is definitely the "low end" of amps nowadays.


thats horrible. 10,000 ohms? vs eclipses 55ohms? you tell me which is better.

The 2V @ 10K spec is the output voltage with 10,000 ohm load. It's NOT the same as the Output Impedance spec.

JLCivic
03-02-2005, 07:51 PM
It's fine. Although 2 V is definitely the "low end" of amps nowadays.



The 2V @ 10K spec is the output voltage with 10,000 ohm load. It's NOT the same as the Output Impedance spec.
You would think Alpine would list the output impedance then. I find it strange that they do not(since more and more people do look at that spec).

iceteebone
03-02-2005, 07:56 PM
i went from 4 volt to my eclipse with 8 volt, 55 ohm preouts and there wasn't a huge difference. also my amps is only made to accept a 5volt input and it does fine. the quality is a little bit better with eclipse, but a alpine or pioneer should do you well.