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post #1 of 18 (permalink) Old 12-30-2012, 11:15 AM Thread Starter
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Amp selection

So I want to put these subs in my suv since they have been laying around for years. I need to get an amp and just a few questions about it. There 2 12" infinity reference that have RMS wattage of 300 a piece so 600rms watts total, 4 ohm. I have been talking to some people and some say just run a mono amp, others say 2 channel amp. I can get a mono and drop it to 2ohm setup, or 2 channel and keep 4 ohm. Its a sealed box and I mostly listen to rock music. What way would you hook up some subs? I know theres some different setups and just curious which way I should go.

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post #2 of 18 (permalink) Old 12-30-2012, 01:55 PM
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It doesn't matter. Unless the thd is ridiculous at the particular impedance you will not notice a difference in sq. I go with however I can get the power cheaper.

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post #3 of 18 (permalink) Old 12-30-2012, 02:15 PM
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Two channel is a waste of money for that application. Find a mono amp you like and run it.

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post #4 of 18 (permalink) Old 12-30-2012, 04:17 PM
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How much power do you have feeding the other speakers in the system?

A key in choosing the sub amp is getting the output you want from the subs relative to everything else. Since the enclosure is sealed, it may be a little power thirsty to begin with.
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post #5 of 18 (permalink) Old 12-30-2012, 04:21 PM Thread Starter
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Originally Posted by Troy View Post
How much power do you have feeding the other speakers in the system?

A key in choosing the sub amp is getting the output you want from the subs relative to everything else. Since the enclosure is sealed, it may be a little power thirsty to begin with.
For now my stock speakers are just hooked up to the radio. I will be getting some type r 110w total power speakers. I will also get the alpine power pack which will also be the amp for the speakers.

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post #6 of 18 (permalink) Old 12-30-2012, 06:09 PM
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post #7 of 18 (permalink) Old 12-31-2012, 12:08 PM
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If it's a single chamber box, I would definitely go with a mono amp. Run it bridged, bring the subs down to 2 ohm and you're done. If you ran a two channel amp to them within the same chamber, you could end up sending different signals to the two subs and they will fight each other and force distortion and possibly destroy the speaker. If they have the same signal to each other, then when they hit they will both be fighting for the same air space and reduce the throw preventing them from over exerting.

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post #8 of 18 (permalink) Old 01-02-2013, 03:59 PM
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Troys points are valid. Probably too much to discuss in one reply.

Your SIMPLE answer is:

Sealed box, MONO in parallel to bring down to 2 Ohms, make sure the boxes are airtight, with a good crossover around .....????? depends on the volume and where your boxes are tuned to.

I would guess the volumes for sealed 12's are small enough that no internal polyfill batting material is necessary.

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post #9 of 18 (permalink) Old 01-07-2013, 03:16 PM
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I have two Orion XTR400 amps for sale if you're interested.

FYI: They were made by "Pre-DEI" Orion.

Still tryin'....
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post #10 of 18 (permalink) Old 01-07-2013, 06:31 PM Thread Starter
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I won an auction for an infinity amp. The rms wattage matches my subs so I should be good. http://www.ebay.com/itm/170965342156...84.m1497.l2649

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post #11 of 18 (permalink) Old 01-08-2013, 10:12 AM
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You can run 800 watts to 250 watt rated speakers as long as the signal is clean (low thd) matching amp watts and speaker watts is a common misconception.

"When in doubt, use full throttle. It may not improve your situation, but it will end the suspense."
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post #12 of 18 (permalink) Old 01-08-2013, 12:20 PM
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Quote:
Originally Posted by Kegger View Post
You can run 800 watts to 250 watt rated speakers as long as the signal is clean (low thd) matching amp watts and speaker watts is a common misconception.
Agreed. It's current and distortion that destroys speakers. Having that extra headroom in the amp is a good thing.

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post #13 of 18 (permalink) Old 01-09-2013, 11:00 AM
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Quote:
Originally Posted by dwillits View Post
I have two Orion XTR400 amps for sale if you're interested.

FYI: They were made by "Pre-DEI" Orion.
how much? ship to me in TN?

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post #14 of 18 (permalink) Old 01-14-2013, 08:13 AM
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Quote:
Originally Posted by Kegger View Post
You can run 800 watts to 250 watt rated speakers as long as the signal is clean (low thd) matching amp watts and speaker watts is a common misconception.
I'm totally agree with you.You'r 100% good here that run 800 h to 250 w ranked sound system as long as the indication is clean (low thd) matching amp watts and speaker watts is a common false impression.
I agreed what's said above!!!
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post #15 of 18 (permalink) Old 01-14-2013, 05:14 PM
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Quote:
Originally Posted by muddy View Post
If it's a single chamber box, I would definitely go with a mono amp. Run it bridged, bring the subs down to 2 ohm and you're done. If you ran a two channel amp to them within the same chamber, you could end up sending different signals to the two subs and they will fight each other and force distortion and possibly destroy the speaker. If they have the same signal to each other, then when they hit they will both be fighting for the same air space and reduce the throw preventing them from over exerting.
I actually have the same subs ur asking about, 2 -12's in a sealed box. I have a kenwood 1000 watt amp.

The above happened to me, where I used a 2 channel amp and you could literally see the subs opposing one another until I bridged it an then ran them together.
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post #16 of 18 (permalink) Old 01-14-2013, 05:24 PM
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Originally Posted by Trevdawg View Post
I actually have the same subs ur asking about, 2 -12's in a sealed box. I have a kenwood 1000 watt amp.

The above happened to me, where I used a 2 channel amp and you could literally see the subs opposing one another until I bridged it an then ran them together.
That sounds like a polarity issue.

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post #17 of 18 (permalink) Old 01-14-2013, 06:09 PM
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Quote:
Originally Posted by Lonely Raven View Post
That sounds like a polarity issue.
+1

You probably just had a wire crossed. How people do that Ill never understand, but it happens.

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post #18 of 18 (permalink) Old 01-14-2013, 06:15 PM
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I dunno. I had the +\- from one channel to the pos/neg of one sub, then had the wiring right for the second sub to the second channel.
I don't remember exactly because it was so many years ago. But either one was going while the second didn't, but I do remember at one point the subs were going opposite of one another.

Weird....
But done with
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