Print Page | Close Window

mono amp and 2 4-ohm DVC subs

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=31465
Printed Date: June 04, 2024 at 2:20 PM


Topic: mono amp and 2 4-ohm DVC subs

Posted By: jesusfreak98
Subject: mono amp and 2 4-ohm DVC subs
Date Posted: May 02, 2004 at 2:59 PM

Watch out - another newbie on board . . .

I am learning more about car audio - unfortunately I'm learning these things AFTER buying equipment.  This is what I have sitting is my living room:

Alpine MRP-M350 700 W mono amp (350W RMS @ 2-ohm)

2 Audiobahn 8" 4-ohm DVC subs (200W RMS)

Now that I understand how the DVC works, it looks like this isn't a very good setup.  So I need to sell something and replace it with either a) a more powerful amp, which will push the subs at 4-ohm impedence (not the best option?) or b) get two 2-ohm DVC subs or two 4-ohm SVC subs (200W RMS)

What do the experts recommend?  I'm not looking to wake the neighbors or break the bank, just looking to improve SQ.




Replies:

Posted By: forbidden
Date Posted: May 02, 2004 at 3:34 PM

Find out if you can return either the amp or the subs in exchange for something different. If you can then we can go about recommending a proper match of equipment to the other.



-------------
Top Secret, I can tell you but then my wife will kill me.




Posted By: stevdart
Date Posted: May 02, 2004 at 3:37 PM

A lot of people (including myself) have collected components for a system that didn't turn out to be the best match.  Don't feel bad.  But you are going the right way by asking about it here.  From what you have, sell the Audiobahns.  They may not be suitable for a SQ setup anyway.  Who knows, maybe it was Divine Intervention that made you buy them as DVC's!

While you're putting your Ebay-sell thing together, look through these posts for suggestions on SQ subs.  You'll find a bunch.



-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.




Posted By: jesusfreak98
Date Posted: May 02, 2004 at 4:34 PM
So this amp is probably OK, but I need some different subs.  Any recommendations - they must be 8".  Any advantage of 2-ohm DVC vs. 4-ohm SVC?




Posted By: customsuburb
Date Posted: May 02, 2004 at 5:46 PM
Memphis, JL audio, and Rockford Fosgate just to name a few make some good 8" subs. Have you looked at buying one 10" sub instead maybe?




Posted By: DYohn
Date Posted: May 02, 2004 at 6:09 PM
Yea, that was my question as well... why must they be 8" subs?  What kind of enclosure do you plan to use?

-------------
Support the12volt.com




Posted By: jesusfreak98
Date Posted: May 02, 2004 at 6:29 PM

I have a convertible Z28, and I'm putting a custom-made box between the back seat and the trunk, just behind where the top fold down.  The box is made to hold two 8s.  Here is more info:

https://members.aol.com/jbslim/Johnn...ge/JohnnyB2.htm

What if I just get another amp to run at a 4-ohm load?  Anyone have anything to say about Profile amps?





Posted By: DYohn
Date Posted: May 02, 2004 at 6:35 PM

Choose subs to match the size of your enclosure if the enclosure cannot be built for the subs.  What's the interior cuft of your "box"?

The Alpine amp will run all day and be very happy at 4 ohms total load.  It will out-class those Audiobahns by a long shot.  Don't waste your money on anything with "Profile" written on it.



-------------
Support the12volt.com




Posted By: jesusfreak98
Date Posted: May 02, 2004 at 6:54 PM

This amp is rated at 200W RMS @ 4 ohms, so that's 100W per sub.  Are you sure that is sufficient for these subs (again, 200W RMS).  I figured I needed an amp pushing around 300-350W RMS @ 4 ohm for these.

As far as the box, the paperwork says th e box volume for each sub is 0.18 cu-ft and the port area is 10 sq-in.  This is where I'm incredibly ignorant!





Posted By: DYohn
Date Posted: May 02, 2004 at 7:01 PM
Those subs will work fine with 200 WRMS for both of them, especially since the Alpine is rated lower than it will normally really operate.  Yes, the speakers advertise that can handle more, but it does not mean they HAVE to have more power.  Try it first and see - especially in a ported enclosure.  I'll bet it is 1.8 cuft and not 0.18 cuft.  If it IS 0.18, then you have a problem as that is way too small for a ported enclosure.

-------------
Support the12volt.com




Posted By: jesusfreak98
Date Posted: May 02, 2004 at 9:38 PM

OK - if there are no other objections, I'll just keep it like this.

One last ignorant question - now I have to get an amp kit, and I'm trying to figure out how I actually wire the two subs into the amp speaker outputs.  Do I hook one wire into each + and  - and "T" them off to each speaker (for parallel), or connect two wires into each port?  Did that make any sense at all to anyone?





Posted By: stevdart
Date Posted: May 02, 2004 at 10:13 PM

You can do it either way.  Do what looks best and the shortest wire runs.  Here is what it would look like:

posted_image

The "T"s actually represent connections at terminals.  Both subs are in one box, so the wiring will end up like this both at the box terminal and at the amp.



-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.




Posted By: jesusfreak98
Date Posted: May 03, 2004 at 9:51 AM

Any other comments from the gallery?






Print Page | Close Window