2 ohm vs 4 ohm fader control
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=134626
Printed Date: May 06, 2024 at 11:24 PM
Topic: 2 ohm vs 4 ohm fader control
Posted By: talarchevy
Subject: 2 ohm vs 4 ohm fader control
Date Posted: July 29, 2013 at 4:28 PM
Ok first the dirty details
2013 F150 crew cab w/FORD sync
Kicker 2 way coaxials (front & rear doors already installed)
Scosche SLC4 LOC
Pioneer shallow SVC 4 ohm sub w/small truck box
Usacoustic US-4085 4channel amp 2ohm stereo stable (oldie but goodie)
4ga q-power amp kit
I'm looking to amplify front door kickers(100khz & up) and bridge sub off of rear channel of amp. However realizing my amp is 2ohm stable in stereo, I'm thinking of running left front and rear parallel off of left front channel of amp and the same with right side. Then using my rear ch for sub bridged at 4ohms. Therefore effectively using Fader control in stock deck as sub volume control(would be nice to turn all the way off if need be), what would be some of the drawbacks doing this method? Would i still technically receive 4CH stereo sound seeing as I will use my front pre out for all four doors and my rear out to run sub? Can the amp handle front 2 ch in 2 2ohm and bridged rear channel in 4ohm mode. This is the first Im considering doing this way, I usually run 2 front speakers on amp and rear ch for sub, keeping rear door speakers on stock deck. Any suggestions would be great. Thanks
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Go BIG or go Home it might not be broke, but lets fix it anyway
Replies:
Posted By: the12volt
Date Posted: July 30, 2013 at 7:56 AM
talarchevy wrote:
...I usually run 2 front speakers on amp and rear ch for sub, keeping rear door speakers on stock deck...
With the equipment you intend to use, this is likely to be your best bet (or at least my preference), but it won't hurt to try it the way you described. If you like how it sounds, then go with it. -------------  the12volt • Support the12volt.com
Posted By: soundnsecurity
Date Posted: July 30, 2013 at 7:38 PM
yea nothing wrong with doing it that way, you will still have stereo sound but keep in mind that your amp will have to work a little harder to sustain the 2 ohm load on the front so make sure it can get ventilation for cooling
Posted By: talarchevy
Date Posted: July 31, 2013 at 4:28 PM
Okay, I think I'll play it safe and just run the front door kickers off of 2ch and sub bridged on rear ch. Really don't want to hook it up at a 2ohm load only to have to get behind dash again to switch to 4 ohm load. Its an older amp too, no need to over work it. However, correct me if I'm wrong, but running amp at lower impedance/resistance, I thought amp would work cooler due to less resistance from load?
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Go BIG or go Home it might not be broke, but lets fix it anyway
Posted By: soundnsecurity
Date Posted: August 01, 2013 at 7:27 PM
no, less resistance allows more current to flow through the amplifier which usually causes more heat. more current flowing through the same size internal circuits will make more heat, but it wont be a dramatic difference in heat between 4 ohm or 2 ohm, and the amp is 2 ohm stable so if you really want to do it then you can but it does increase the risk of something inside the amp getting too hot and failing
Posted By: talarchevy
Date Posted: August 04, 2013 at 7:49 PM
Finally got it all installed and hooked up, Only had to remove 100 screws to get behind stock radio harness, lol. I hooked it up 4ohm, kept it simple. Sounds great, amp really brings out the stock tweeters. Thanks for the info guys.
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Go BIG or go Home it might not be broke, but lets fix it anyway
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