Bridged 4 channel amp for dvc sub
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=76604
Printed Date: July 12, 2025 at 12:48 PM
Topic: Bridged 4 channel amp for dvc sub
Posted By: bryzaa
Subject: Bridged 4 channel amp for dvc sub
Date Posted: April 22, 2006 at 7:41 AM
I'm a bit new at this but I have a dvc dual 3.7 Ohm sub and at the moment a 4 channel amp, I want to bridge both channels and run one to each voice coil, is this possible. At the moment I only have one voice coil hooked up to the bridged rear channels of the amp, until I get another terminal put in my sub box, what I was wondering is my rear channels has a LP filter and HP filter and full but my front channels switch can only be at HP filter or full. Is this common? When I switch my rear channel to LP filter does that put whole amp in LP filter mode, or can I not use my front channels for a sub? I am confused. It is a cheap amp so I don't know if it has all the features of a better one. Any advice would be appreciated.
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Bryzaaa
Replies:
Posted By: xscash
Date Posted: April 22, 2006 at 8:01 AM
no, the filter is only for the input it is marked for. you could try your rear filter in full...see how it sounds. or even get a active crossover to go before the amp.. good luck
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expandable sound
south of boston
Posted By: bryzaa
Date Posted: April 22, 2006 at 8:08 AM
so could I get a crossover and put it inbetween amp and sub running off bridged front channels with amp crossover on full?
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Bryzaaa
Posted By: haemphyst
Date Posted: April 22, 2006 at 8:18 AM
An external crossover would fix that situation, and as long as the front channels are bridgeable, yes you could do this.
I have done it many times, but as I said the front channels MUST be bridgeable! If they are not, then you are left with running the woofer on the rear channels.
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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: bryzaa
Date Posted: April 22, 2006 at 8:36 AM
sounds good they are deffinately bridgable. Just wondering those relays that are for switching from series to parralel and back are they just standard ones that I can get from a car accesories shop?
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Bryzaaa
Posted By: Velocity Motors
Date Posted: April 22, 2006 at 8:56 AM
bryzaa wrote:
sounds good they are deffinately bridgable. Just wondering those relays that are for switching from series to parralel and back are they just standard ones that I can get from a car accesories shop?
They are the normal SPDT 30/40 amp automotive relays. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: bryzaa
Date Posted: April 22, 2006 at 8:12 PM
where would I be able to get said relays are they redily available, and I am only in little New Zealand, are they the kind that any alarm fitting place would have?
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Bryzaaa
Posted By: forbidden
Date Posted: April 22, 2006 at 9:57 PM
Yes they are. Thinking about the crossover issue a little more, I would think that most amplifiers when tasked to be bridged from 4 channels to 2, would more than likely source the crossover to be hp, lp or full range. What amp is this that you have? A Jaycar by chance?
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Top Secret, I can tell you but then my wife will kill me.
Posted By: bryzaa
Date Posted: April 23, 2006 at 7:18 PM
It is a SAGA Audio USA amp 1800w Max it says but i think it is only about 350 real watts It seems strange that it doesn't have a LP filter at the front channels, as I only bought my sub to run on this amp then noticed this when I was wiring it up, and decided not to do it and rather seek advice from this forum instead
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Bryzaaa
Posted By: stevdart
Date Posted: April 23, 2006 at 8:43 PM
A lot of four channel amps have a HP on the fronts and a LP on the rears.
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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: forbidden
Date Posted: April 24, 2006 at 12:13 AM
Throw us a link to the amp please. If you cannot find one, post this question on www.boostcruising.com attn TUN35 (Neal). That site is Australian based and they may be much more familiar with this brand of amp as it may be a local one that we do not have here. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: bryzaa
Date Posted: April 24, 2006 at 7:41 AM
i have looked for my amp on the net but I can't find any the same. It is Saga Hg-7450 there is a few diferent amps all with the same model number and I have seen photos of them for sale but they are all slightly different, eg mine has writing ontop of the amp Mosfet etc. I think it is just a medium powered low quality amp I have link here to bs power ratings, I know now they are rubbish but it looked good when I knew a bit less than I do after spening some time in these forums, cheers guys. https://www.trademe.co.nz/Browse/Listing.aspx?id=51553361 ------------- Bryzaaa
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