2 or 4 ohms?
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=37962
Printed Date: May 28, 2024 at 11:11 PM
Topic: 2 or 4 ohms?
Posted By: Germanesma
Subject: 2 or 4 ohms?
Date Posted: August 23, 2004 at 4:28 PM
Hello there! I just bought a Cerwyn Vega 10" subwoofer. With 2 voice coils of 4 ohms/coils. RMS: 200W, max: 500W
I have a amplifier with this specs:
1 Ch x 120W at 4 ohm (0.1% THD)
1 Ch x 60W at 2 ohm (0.1% THD)
Sony Xplod I am a little bit confused about how should I connect them.
What is better, with 2 ohms? or with 4 ohms? If anyone could help me, I will appreciate.
------------- Eggs putines!
Replies:
Posted By: 94legend
Date Posted: August 23, 2004 at 4:57 PM
From What you have listed, Do you have 1 subwoofer or 2? The model of the Cerwin Vega that you are refering to is the HED - 10 correct? From what I am aware, running the amp load impedance at 4 ohms single/dual VC's would be the correct way. I just wanted to point out, to determine the best way to run the load will depend on your sub / amp ohm load. Run the the wire as posted on option #2
 
Posted By: Germanesma
Date Posted: August 23, 2004 at 5:01 PM
You are right. That is the amp that I bought.
Is that a good one?
I just have 1 Sub. ------------- Eggs putines!
Posted By: 94legend
Date Posted: August 23, 2004 at 5:09 PM
What Model is the sony ampilifier?
I should have asked this on the previous post, how many voice coils does your sub woofer have? 2 as DVC's or 2 as in SVC's? I'm not very familiar with Cerwin Vega's
Since you have a once subwoofer here is my suggestion :
 If they are DVC's Run them as soo:
Posted By: Germanesma
Date Posted: August 23, 2004 at 5:11 PM
It is a DVC.
And the amp model is:
Sony Xplod XM-502Z Could you tell me why you are suggesting me that? ------------- Eggs putines!
Posted By: Germanesma
Date Posted: August 23, 2004 at 5:26 PM
Besides, how do I have to do, in order to have 2 ohm at the amp? ------------- Eggs putines!
Posted By: 94legend
Date Posted: August 23, 2004 at 5:29 PM
I am suggesting this from your amp/sub capabilities. Due to the fact that you are limited by the equipment you have, this is the only option that i am able to come up with for you. Are you questioning my suggestions? As if they are wrong / incorrect? Just wanted to point out to you, in this forum, if you have ever bring up sony products you will be mortifieded.
Go to this link, the thread in this forum and read upon the specs and opinions on your "system".
https://www.diyaudio.com/forums/showthread/t-32716.html
I hope this will help answer all of your further questions.
Posted By: Germanesma
Date Posted: August 23, 2004 at 5:33 PM
Come on! I am not questioning you if you were wrong or something! I DO NOT know anything about the subject, and what I want, is understand why. Just that. Because I want to install it myself. ------------- Eggs putines!
Posted By: dragonrage
Date Posted: August 23, 2004 at 5:43 PM
Run the coils in parallel...Connect both reds together and both blacks together as 94legend's second pic. shows.... I am going to assume you got the power ratings backwards for the amp, though. heh ------------- 2009 Pontiac G8 in planning stage
HU: ?
Speakers: ?
Amps: ?
Posted By: DYohn
Date Posted: August 23, 2004 at 5:48 PM
That amplifier cannot run at 2-ohms mono. It is a stereo amp and requires at least a 4-ohm load when bridged. This is not a good amp/sub combination. ------------- Support the12volt.com
Posted By: dragonrage
Date Posted: August 23, 2004 at 5:49 PM
Oh, he did mention the amp, my bad... I went by his specs. Sorry, ignore my last post.
-------------
2009 Pontiac G8 in planning stage
HU: ?
Speakers: ?
Amps: ?
Posted By: haemphyst
Date Posted: August 23, 2004 at 7:17 PM
Run the amp in stereo, one channel to each voice coil. Done. It is the safest and easiest way to do it. Do not worry if some others might say "not good for such and such reason". Just do it, and be done with it. It is PERFECTLY SAFE to do so. If you don't believe me,PM Stephen Kephart, and he will tell you the same thing. Your amps (neither one) will not support that woofer with paralleled voice coils in a bridged configuration, so just run one VC to each channel, and be done.
-------------
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: DYohn
Date Posted: August 23, 2004 at 7:53 PM
Or (my preferred method) wire the VCs in series for 8-ohms and bridge the amp, which places the same net impedence on the amplifier channels and ensures a mono signal to both VCs. ------------- Support the12volt.com
Posted By: Germanesma
Date Posted: August 24, 2004 at 8:42 AM
Look guys...
I don´t want to shake my car, and be listened from 3 blocks away.
As a matter of fact I just have two pairs of 6" speakers at front and rear, and the radio. Nothing more,
What I want is to add more bass to my system, not enter to a competition.
I know also, that is not a great AMP-SUB combination.
But will it work well for my needs?
What would be the best connection:
a) One channel to each voice coil??
b) wire the VCs in series for 8-ohms and bridge the amp
I really need your best suggestions.
Thanks
-------------
Eggs putines!
Posted By: dragonrage
Date Posted: August 24, 2004 at 9:15 AM
Try both ways and see what sounds better to you. Either way will work without destroying your amplifier, but neither way is optimal. You could also try using just one coil on the speaker and hook the amp up in bridged mode. The loss in sensitivity may or may not make up for the loss of current you'd get from the above 2 methods.
-------------
2009 Pontiac G8 in planning stage
HU: ?
Speakers: ?
Amps: ?
Posted By: Germanesma
Date Posted: August 24, 2004 at 9:21 AM
What would be the optimal amplifier to that kind of sub??? Or, what would be the optimal sub for that amp??? ------------- Eggs putines!
Posted By: Germanesma
Date Posted: August 24, 2004 at 9:49 AM
Germanesma wrote:
What would be the optimal amplifier to that kind of sub??? Or, what would be the optimal sub for that amp???
For the sub, could be a better option a Sony Xplod 10" XS-L101P5 ??????? ------------- Eggs putines!
Posted By: fuseblower
Date Posted: August 24, 2004 at 9:50 AM
Since you are not wanting to wake the neighbors I would try the amp both ways stereo and bridged. It all depends on which way sounds better to you. In the stereo mode the amp will play louder than in the 8 ohm mono set-up. However, if you set-up your sub to play at 8 ohms mono it will be cleaner and play with less distortion.
Posted By: DYohn
Date Posted: August 24, 2004 at 9:50 AM
Connect it either way, it will result in the same power to the sub and it will be "optimal" for this sub/amp combo. The "optimal" amp for any sub is a mono amplifier rated for the same RMS power and total voice coil impedence as your sub(s). ------------- Support the12volt.com
Posted By: dragonrage
Date Posted: August 24, 2004 at 9:57 AM
Germanesma, first of all, I would recommend you stop buying Sony. They aren't the absolute worst, but you can get much better for the money. Since you asked: you'd want either a DVC 2-ohm per coil sub, a SVC 4-ohm coil sub, 2 DVC 4-ohm per coil subs, 2 DVC 1-ohm per coil subs, 2 SVC 8-ohm coil subs, and/or a new amp meant for subs. The amp you have is better suited for a regular set of speakers.
-------------
2009 Pontiac G8 in planning stage
HU: ?
Speakers: ?
Amps: ?
|