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Amp/4th order bandpass question?

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=62779
Printed Date: May 16, 2024 at 6:54 PM


Topic: Amp/4th order bandpass question?

Posted By: upstim
Subject: Amp/4th order bandpass question?
Date Posted: September 16, 2005 at 8:11 PM

Hey guys, any answers will help greatly! I have two seperate 4th order bandpass boxes loaded with two 4 ohm single voice coil 12" woofers which are wired in parallel for 2 ohm load. I have two amps that are stable down to 2 ohms(one for each enclosure). When I first wired it up I bridged the amps mono(+ from left channel; - from right channel). Amp paperwork says mono wiring =4 ohm load. First question, what ohm load did I put on the amps? Anyway, my amps kept going into protection mode. Okay, now for my main question. I now have each box running off of just one channel of each amp and the other channel open (nothing connected). Would it be better to run each woofer off of 1 channel each or leave it the way it is? Also, if I run each box off of only one channel, is it better to have two amps or should I run both boxes off of one amp and sell the other amp? If anyone could configure this system optimally I would greatly appreciate it. Thanks in advance. Tim (By the way, the 12's are 400 watt rms each, the way I have it now each channel puts out 500 watts rms at 2 ohm, if I wire each sub to a channel the amp puts out 340 watts rms per channel at 4 ohm. Thanks)



Replies:

Posted By: haemphyst
Date Posted: September 16, 2005 at 8:44 PM
upstim wrote:
Hey guys, any answers will help greatly! I have two seperate 4th order bandpass boxes loaded with two 4 ohm single voice coil 12" woofers which are wired in parallel for 2 ohm load. I have two amps that are stable down to 2 ohms(one for each enclosure). When I first wired it up I bridged the amps mono(+ from left channel; - from right channel). Amp paperwork says mono wiring =4 ohm load.

Which EQUALS 2 ohms per channel...

upstim wrote:
First question, what ohm load did I put on the amps?

One ohm per channel - TWICE what it is rated for

upstim wrote:
Anyway, my amps kept going into protection mode.

Ya think? posted_image posted_image

upstim wrote:
Okay, now for my main question. I now have each box running off of just one channel of each amp and the other channel open (nothing connected). Would it be better to run each woofer off of 1 channel each or leave it the way it is?

You have 4 channels of amplification, and 4 woofers. The best you can do safely, is 4 ohms per channel, all 4 channels running.

upstim wrote:
Also, if I run each box off of only one channel, is it better to have two amps or should I run both boxes off of one amp and sell the other amp? If anyone could configure this system optimally I would greatly appreciate it. Thanks in advance. Tim (By the way, the 12's are 400 watt rms each, the way I have it now each channel puts out 500 watts rms at 2 ohm, if I wire each sub to a channel the amp puts out 340 watts rms per channel at 4 ohm. Thanks)

You don't have enough output with 1360 watts? You may need to have your hearing checked. Run it in 4 channel mode - one woofer to each channel, and be done with it...

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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."


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