4ohm dvc sub to a 4ohm stable mono amp?
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=121115
Printed Date: May 19, 2024 at 8:14 AM
Topic: 4ohm dvc sub to a 4ohm stable mono amp?
Posted By: porschedrifter
Subject: 4ohm dvc sub to a 4ohm stable mono amp?
Date Posted: April 01, 2010 at 1:39 PM
Ok. Last night I was a little tired and ordered a DVC sub instead of a SVC accidentally.
I'm building a little system for my sister's car.
Amp: AUDIOBAHN DUB2502 ==
* 4 Ohm Stereo: 250 x 2
* 2 Ohm Stereo: 375 x 2
* 4 Ohm Mono: 500 x 1
Sub: Sony XS-LD105P5
* Impedance : 4 + 4ohms
* 350W RMS
Now I need some help on the wiring...
Is there any other way I can wire it apart from (parallel) = 2 ohm load or Option 2 (series) = 8 ohm load?
If I wired the sub in series at an 8ohm load then connected the wires to my amp's two channels (instead of bridging) wouldn't that just be a 4ohm stereo load?
I'm basically asking what the optimal connection for this sub would be, one DVC sub. Or am I stuck wiring series and bridging to the amp as normal?
Replies:
Posted By: awdeclipse
Date Posted: April 01, 2010 at 1:45 PM
Wire in series, 8ohm load. Then hook up to the amp bridged mono. That will be a 4 ohm load that the amp "will see" (half on each channel)
This is what I've always done in the past for stereo amps. For a mono only amp, i'm not sure the same holds true with regards to the amp seeing half the load on each channel.
Posted By: porschedrifter
Date Posted: April 01, 2010 at 2:12 PM
What i'm confused about is, If I wired the sub in parallel, then connected it to my amp's two channels making it stereo, what would the ohm load be then?
Posted By: porschedrifter
Date Posted: April 01, 2010 at 2:43 PM
Like this: 
Is this possible, if so what would the ohm load be?
Posted By: DYohn
Date Posted: April 01, 2010 at 5:08 PM
No. Wiring the voice coils in parallel creates a 2-ohm load, period. Wiring your amp that way may or may not fry it, depending on the amp. Either wire one VC to each channel by itself or wire the sub for 8-ohms and bridge it. Or use only one voice coil and bridge the amp and keep the volume down so you don't over drive the VC. ------------- Support the12volt.com
Posted By: porschedrifter
Date Posted: April 01, 2010 at 5:24 PM
Thanks for the reply.
I was considering wiring each VC to each separate channel, but I was looking for an easy way around adding another wire terminal to the box.
Can you help me understand how it's different from wiring the sub parallel and then just branching off the same wire and connecting to both channels of the amp? If it stays a 2ohm load, and this amp is 2 Ohm Stereo stable then doesn't that accomplish the same thing?
Or am I way off?
Posted By: porschedrifter
Date Posted: April 01, 2010 at 5:39 PM
I would be getting more power to each VC if I wired each VC to each channel. I want to avoid the series to 8ohm load wiring as well as just one single VC.
Posted By: i am an idiot
Date Posted: April 01, 2010 at 9:23 PM
The amp will make the same exact power into an 8 ohm mono load as it will into a 4 ohm stereo load. I am not saying close to the same power. I am saying the same exact amoount of power.
Posted By: z03mz03m
Date Posted: April 02, 2010 at 12:28 AM
porschedrifter wrote:
but I was looking for an easy way around adding another wire terminal to the box.
Don't use wire terminals just drill a hole the size of the wire (two if needed) and caulk around it(them)inside and out; and make sure you leave plenty of extra wire to reach the amp.
Wire terminals = air leak = VERY BAD.
Posted By: porschedrifter
Date Posted: April 02, 2010 at 12:47 PM
i am an idiot wrote:
The amp will make the same exact power into an 8 ohm mono load as it will into a 4 ohm stereo load. I am not saying close to the same power. I am saying the same exact amoount of power.
HAHAHAH, Thanks for that bit of an epiphany... I'll just do the 8ohm mono wiring then!
See, this is why you guys are needed in this world, to help people like ME
Posted By: haemphyst
Date Posted: April 02, 2010 at 2:54 PM
z03mz03m wrote:
porschedrifter wrote:
but I was looking for an easy way around adding another wire terminal to the box.
Don't use wire terminals just drill a hole the size of the wire (two if needed) and caulk around it(them)inside and out; and make sure you leave plenty of extra wire to reach the amp.
Wire terminals = air leak = VERY BAD.
1: Terminal cups are FAR better than running wire through the box. I have never had any issue with terminal cups... EVER. If installed CORRECTLY, and you use quality terminal cups, there WILL be no issue.
2: Caulking your wires into the box, and leaving pigtails is GHETTO, dude.
3: A small air leak will NOT cause the issues you think they will... They simply won't. ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: z03mz03m
Date Posted: April 04, 2010 at 9:14 PM
https://www.you tube.com/watch?v=MNp6KrGnsnw time - 5:50
I'm not saying to never use wire terminals ever, for instance if you want to be able to take just your box out easily; but if your on a budget like the OP seems to be on, why spend money on terminals. Just drill holes and 1) use less wire 2) fewer connections to worry about.
Why not just drill a hole were the wire needs to go instead of running them around the amp.
Again why not just drill a neat little hole.
My main point for this post is what do you get for the money you spend on a terminal and sealant? Arguable aesthetics? It certainly doesn't improve sound quality or anything.
Just my thoughts though and I thought it was viable in this situation.
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