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half ohm 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=103723
Printed Date: November 27, 2022 at 4:05 AM


Topic: half ohm amp

Posted By: willdkartunes
Subject: half ohm amp
Date Posted: April 04, 2008 at 11:09 PM

Does anybody know where I can find an amp with around 2000watts rms @ .5 ohm stable (or more watts at .5 ohm)

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Do whatever makes you happy in life without diminishing the happiness of others



Replies:

Posted By: tattooedkaos
Date Posted: April 05, 2008 at 12:22 AM
well I have come to learn that the closer you push the amp to it's max ohm load, the more distortion and efficiency loss you have. I am in no way an expert, actually having just learned these things myself recently! Are you looking for a mono or 2 channel amp?

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60% of the time it works every time!




Posted By: DYohn
Date Posted: April 05, 2008 at 10:23 AM
US Amps used to make some really good 1/2-ohm stable amps (that cost around $1000) and there is the venerable Orion 250HCCA which is designed to handle a 1/2 ohm load.  Whay do you need to wire at 1/2 ohm?

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Posted By: haemphyst
Date Posted: April 05, 2008 at 10:34 AM
I can't think of ANYTHING today (in any kind of respectable name with REAL power specifications...) that will do .5 ohms. Like DYohn says, USAmps made some really nice ones (never had any experience with those, personally) and the original Orion reds would do .5 ohms. (I actually PERSONALLY ran a 225HCCA bridged into .5 ohms, for .25 ohms per channel... Sure, I had to modify it with a larger power and ground cable, and forced cooling, but it DID it.) Both the 225HCCA and the 250HCCA should be available on eBay.

I also echo the closing question from DYohn: Why do you need to wire at 1/2 ohm?

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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: tattooedkaos
Date Posted: April 05, 2008 at 10:55 AM
a friend of mine is looking to sell one of those amps, I am not for sure whether it is a 250 or a 225, i know it's huge, red and about 2' long. I can check with him later tonight about model and price, all I can remember him saying about it is that it did .5ohm stable

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60% of the time it works every time!




Posted By: tattooedkaos
Date Posted: April 05, 2008 at 10:58 AM
actually, come to think about it, I think he said it was a HCCA 275

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60% of the time it works every time!




Posted By: tattooedkaos
Date Posted: April 05, 2008 at 11:03 AM
sorry to post so many times so fast, I just got off the phone with him, it is an Orion HCCA 275 G4, it can easily do 1800 watts RMS at .5ohm stable, given that you supply it the raw power it needs, it has 6-30amp fuses

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60% of the time it works every time!




Posted By: haemphyst
Date Posted: April 05, 2008 at 11:05 AM
The 275 is NOT the same thing as the 225/250. While still a good amp, (and if you can get it for a good price - do so) I wouldn't push that one past .5 ohms per channel.

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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: tattooedkaos
Date Posted: April 05, 2008 at 1:04 PM
what would you consider a good price? I don't know anything about older amps, and my buddy wants $450 for that one, and to me that seems a bit steep, but what do I know?

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60% of the time it works every time!




Posted By: willdkartunes
Date Posted: April 05, 2008 at 2:06 PM

DYohn] wrote:

S Amps used to make some really good 1/2-ohm stable amps (that cost around $1000) and there is the venerable Orion 250HCCA which is designed to handle a 1/2 ohm load. 

Of course Orion came to mind right away (I love orion in case most people on here didn't know), but I would have to search for a used one on ebay since I stupidly sold all of my older Orion gear years ago. With the prices people were offering me on that stuff, I just couldn't pass it up. Anyway, buying used on Ebay is sketchy at best. I certainly don't trust most people with ANY used electronics, ESPECIALLY amps. If I knew someone credible with an Orion 250HCCA, then I would buy it in a heartbeat.

DYohn] wrote:

hay do you need to wire at 1/2 ohm

I need a 1/2 ohm stable amp to hook up to the IA DP 12D1 that I purchased. I am looking for a little edge over the competition that is coming up. They only take the 4 ohm rating of the amp. So if I was running a really high amount of wattage at 1/2 ohm, then I would still be in a low wattage class due to them only taking the 4 ohm ratings.

I have heard some people say that you can take a 1ohm stable amp and hook it up to a sub/subs that are wired at .5 ohms and play it for competition purposes and it will work (couple seconds burp). This has me thinking about a couple of things when I hear people say this:

1) Most amplifiers now have a protection circuit that will shut the amplifier off when it is seeing on ohm load that the amplifier is not capable of handling.

2) For amplifiers that do not have this protection circuit, running ohm loads lower than the manufacture suggests is a little dangerous to say the least.... I would rather not open my trunk and find anything on fire.

3) Would an amp that is capable of producing 1800watts rms @ 1 ohm be able to produce more watts rms @ 1/2 ohm? I would think this is certainly possible, so I will go out on a limb and answer yes to my own question for this one.

If it is not possible to squeeze more power than rated, then the risk is not worth it.



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Do whatever makes you happy in life without diminishing the happiness of others




Posted By: jeffchilcott
Date Posted: April 08, 2008 at 6:01 AM
Most amps will run for a short period of time above thier recomended specs. I.E Lower Impedances, higher voltages.   If and how long depends on the manufacturer and protection curcuits.

The best way it to call the manufacturer and ask them,   They will generally let you know what you can and cant do for competitions.

I noticed youi mentioned power ratings, What USACI show will you be running, just wondering.

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place




Posted By: willdkartunes
Date Posted: April 08, 2008 at 10:18 AM
Not starting off that big yet. It's a little nothing local comp. Figure I'll get my stuff dialed in first before entering in a big event like IASCA or USACI.





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