2V vs 4V PreOuts - how much difference is there really? - DFWstangs Forums
 
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post #1 of 24 (permalink) Old 03-05-2005, 08:36 PM Thread Starter
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2V vs 4V PreOuts - how much difference is there really?

I've been doing some research and trying to figure out what parts I want for my system. All along I've said that the head unit I get must have 4V PreOuts for my amps. The thing is, I don't know why this is a must. How much better is 4V than 2V? What is the main function of the number of volts on the PreOuts? I've found 2 Alpine head units that I like out on their website and there are a few differences between the two, but as far as what I'm looking for, the only differences bewteen the 2 are the V on the PreOuts. Oh, the one with 4V is $150 more.
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post #2 of 24 (permalink) Old 03-05-2005, 09:45 PM
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Get bit by the bug today? Next time, a longer drive to hear more music.


Those Alpines were nice that you were looking at. I'd like to find a new head unit with Bluetooth support... EW?
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post #3 of 24 (permalink) Old 03-06-2005, 07:05 AM
 
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obviously the diff is 2v ... which will provide a hotter signal to your amp. You wont have to push the amp as hard. I"d go w/ the hottest preamps you can get.
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post #4 of 24 (permalink) Old 03-06-2005, 07:38 AM
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Just like with mustangs, 4V is better than 2V.
The more signal you can run into an amp, the less noise you will have and you will be able to run the gain lower so the amp will sound better. For $150 there must be many other differences in the radios you're looking at. If you really want some good signal, you should get an Audio Control Overdrive or Matrix. 9V RMS. If you post the models you're thinking about, I may be able to tell you what the differences are.
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post #5 of 24 (permalink) Old 03-06-2005, 09:15 AM Thread Starter
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Quote:
Originally Posted by EW
Just like with mustangs, 4V is better than 2V.
The more signal you can run into an amp, the less noise you will have and you will be able to run the gain lower so the amp will sound better. For $150 there must be many other differences in the radios you're looking at. If you really want some good signal, you should get an Audio Control Overdrive or Matrix. 9V RMS. If you post the models you're thinking about, I may be able to tell you what the differences are.
The main diff is that one is a 2004 model and one is a 2005. Actually, I was looking at the 9831 from '04 (msrp of $450 out on alpines website) and the 9851 from '05 (msrp of $300). I know real world prices are different and EW will hook me up so no one has to tell me that. I looked them over on the site and I'm sure there are some important differences, but it all looks relatively the same to me...except for the PreOuts.

Thoughts EW?
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post #6 of 24 (permalink) Old 03-06-2005, 04:23 PM
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The 9831 is twice as expensive for a reason. 5 band parametric EQ, time correction, motorized face, 512 color buttons, dual line display, built in crossovers, 4V pre out, remote,etc.
On sale now.
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post #7 of 24 (permalink) Old 03-06-2005, 07:18 PM Thread Starter
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Quote:
Originally Posted by EW
The 9831 is twice as expensive for a reason. 5 band parametric EQ, time correction, motorized face, 512 color buttons, dual line display, built in crossovers, 4V pre out, remote,etc.
On sale now.
I suppose the features that I made bold would keep me from having to invest in additional processing components to get better sound?

What I've got so far in my mind for the front stage is the 9831 leading directly into my PPI A404 (50x4 - but bridged will run approx 200x2 - which is how I intend to use the amp), which would then power a set of the MBQ PCE216s. I imagine that I would use the Alpine deck to power the factory speakers in the rear doors. The Alpine has the time correction, so I don't know that I would need anything else for processing to create a great soundstage other than proper speaker placement. So, coming from an audiophile standpoint, am I missing anything?

The lower frequencies have already been planned out.
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post #8 of 24 (permalink) Old 03-06-2005, 08:11 PM
 
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Since you are an audiophile go down to autosound and get the "Audio Control Overdrive or Matrix. 9V RMS." like EW suggested above. That is really really good shit And compared to what you are already spending ... chump change.
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post #9 of 24 (permalink) Old 03-07-2005, 06:28 AM Thread Starter
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Quote:
Originally Posted by probetalk
Since you are an audiophile go down to autosound and get the "Audio Control Overdrive or Matrix. 9V RMS." like EW suggested above. That is really really good shit And compared to what you are already spending ... chump change.
And I gain what by doing that? The ability to hear no "hiss" in between songs? Or is it a whole lot more than that?
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post #10 of 24 (permalink) Old 03-07-2005, 07:56 AM
 
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it just makes the preamp signal very hot, meaning you dont have to push your amps as hard, and the signal will be cleaner. as ew stated above. 4V has always worked fine for me, but i'm not an audiophile
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post #11 of 24 (permalink) Old 03-07-2005, 09:53 AM
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Quote:
Originally Posted by mustang_marc
I imagine that I would use the Alpine deck to power the factory speakers in the rear doors. The Alpine has the time correction, so I don't know that I would need anything else for processing to create a great soundstage other than proper speaker placement. So, coming from an audiophile standpoint, am I missing anything?

The lower frequencies have already been planned out.
Why not put the PCE's in the second doors also to round it out?
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post #12 of 24 (permalink) Old 03-07-2005, 10:57 AM Thread Starter
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Quote:
Originally Posted by TMA
Why not put the PCE's in the second doors also to round it out?
$$. And I don't ever sit in the back seat. The factory stuff is fine for rear fill.
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post #13 of 24 (permalink) Old 03-07-2005, 01:48 PM
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Quote:
Originally Posted by mustang_marc
$$. And I don't ever sit in the back seat. The factory stuff is fine for rear fill.
You don't think the Alpine will burn 'em up?
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post #14 of 24 (permalink) Old 03-07-2005, 01:57 PM
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CHECK THIS ONE OUT....IT ROCKS !!!

http://www.crutchfield.com/S-dsPYARa...0cda9833&wm=cl

For only $20 more than a CDA 9851 and much less than the CDA 9831 it is worth it. I'm running it with upgraded speakers (Boston RX87 & Polk Momo MMC570 5x7s) off the Alpine's amp and it sounds GREAT! Plus you get free install kit & free shipping !!!
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post #15 of 24 (permalink) Old 03-07-2005, 02:35 PM
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Voltage isn't the only concern, in terms of audio signal strength, however it does play an important role.

IF alpine's 2v signal were low impedance 2v, it'd probably be better than most other companies' 3v, similar to eclipse's 3v pushing as much music into amps as Clarions, Pioneer, Kenwood etc. 4~5v pieces.


I use 8v with a rated 55ohm/ft impedance as opposed to a Clarion (and others) 5v with close to 1000 ohm/ft

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post #16 of 24 (permalink) Old 03-07-2005, 03:32 PM
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Output impedance on the Matrix is 50 ohms.
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post #17 of 24 (permalink) Old 03-07-2005, 04:51 PM Thread Starter
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Quote:
Originally Posted by lwk2
CHECK THIS ONE OUT....IT ROCKS !!!

http://www.crutchfield.com/S-dsPYARa...0cda9833&wm=cl

For only $20 more than a CDA 9851 and much less than the CDA 9831 it is worth it. I'm running it with upgraded speakers (Boston RX87 & Polk Momo MMC570 5x7s) off the Alpine's amp and it sounds GREAT! Plus you get free install kit & free shipping !!!
Holy chit man! That's a steal! I hadn't really considered it, but at that cost - it is most defintely cheaper than the 9831 and considerably better than the 9851. The other goodies make it all the more worthwhile.

EW is gonna hate you for posting that link though!
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post #18 of 24 (permalink) Old 03-07-2005, 04:54 PM
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Nope. I can match it and I have it in stock too.
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post #19 of 24 (permalink) Old 03-07-2005, 05:07 PM
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Do you have a 9835 in stock? If so how much?
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post #20 of 24 (permalink) Old 03-07-2005, 05:28 PM
 
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Buy it from EW he's a cool guy ... and is very easy to work with when honoring warranties. And you can get that instant gratification of getting it "now".
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post #21 of 24 (permalink) Old 03-07-2005, 05:57 PM
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Quote:
Originally Posted by lwk2
Do you have a 9835 in stock? If so how much?
Sold out. Higher end 2005 models will be out in late april.
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post #22 of 24 (permalink) Old 03-24-2005, 02:56 PM Thread Starter
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Quote:
Originally Posted by lwk2
For only $20 more than a CDA 9851 and much less than the CDA 9831 it is worth it. I'm running it with upgraded speakers (Boston RX87 & Polk Momo MMC570 5x7s) off the Alpine's amp and it sounds GREAT! Plus you get free install kit & free shipping !!!
I bet the 9833 does run those co-ax speakers pretty well. I don't know about the component set that I have though.

BTW, I got that bad boy wired up last night and it's an awesome head unit! I love it so far.
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post #23 of 24 (permalink) Old 03-24-2005, 04:41 PM
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Do not wire those components to the deck power.
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post #24 of 24 (permalink) Old 03-25-2005, 07:35 AM Thread Starter
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Quote:
Originally Posted by EW
Do not wire those components to the deck power.
Don't worry - It never seriously crossed my mind! Especially with the A404 waiting in the wings. I'm gonna leave that to you guys anyway because I don't know much about setting up the crossovers, etc.
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