amp, infinity reference 611a

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=114602
Printed Date: May 15, 2025 at 12:01 AM

Topic: amp, infinity reference 611a

Posted By: rmsg0040
Subject: amp, infinity reference 611a
Date Posted: June 21, 2009 at 4:25 PM

Hey guys, this is my fisrt post on this site. I am fairly new to car audio. I have only done one system before and it was small. A 200 watt rms amp and a single 12" 200rms sub.

Right now I have picked up a Infinity reference 611a amp. Here are the stats: https://www.crutchfield.com/p_108R611A/Infinity-Reference-611a.html?tp=115

I have also scored these 2 10" subs in a ported box: https://www.futureshop.ca/catalog/proddetail.asp?logon=&langid=EN&sku_id=0665000FS10085249&catid=

Picked up both for $360. Amp is used and subs are brand new.

Heres my dilemma:

On the back of the sub box there is one connection. A 2 ohm - +

On the amp the speaker connections are - + - +

On which connection do I connect the sub box to. Is it the first set, the second set, or is it the first negative and last positive.

I have read the manual but I am still unclear.

Thanks.

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GKR

Replies:

Posted By: i am an idiot
Date Posted: June 21, 2009 at 4:31 PM

The amp is a one channel amp. Both of the positve terminals of the amp are electronically connected together inside the amp. Same for the negative terminals. It makes no difference which positive you use, and no difference which negative terminal you use.

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Posted By: rmsg0040
Date Posted: June 21, 2009 at 4:40 PM

It didnt make sense at first cause @ 4 ohms there is one output of power and @ 2 ohms the output is much greater. Thats what I was thinking.

For example: So if I were to connect a single 4 ohm sub to either connection or a single 2 ohm sub to either connection. How does the amp know whether it is 2 or 4 ohms?

You have solved my problem but I am trying to figure this out.

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GKR

Posted By: icearrow6
Date Posted: June 21, 2009 at 4:48 PM

The ohms are the total load on the speaker terminals. the amp will "see" the load or ohms depending on the wiring of the SUBS not which terminal you use.
In other words the OHMS is the WOOFERS not the amp's terminals.

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Posted By: rmsg0040
Date Posted: June 21, 2009 at 5:16 PM

I knew that the ohms was for th subs. What I didnt know is that the amp sees that load.

Thanks.

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GKR

Posted By: rmsg0040
Date Posted: July 29, 2009 at 4:34 PM

Finally installed:

posted_image

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GKR

Posted By: ianarian
Date Posted: July 29, 2009 at 5:58 PM

Nice, btw what size wires did you run for the power? Just wondering the length/location of the ground.

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This is what I do for FUN!

Posted By: rmsg0040
Date Posted: July 29, 2009 at 6:03 PM

ianarian wrote:

Nice, btw what size wires did you run for the power? Just wondering the length/location of the ground.

For power and ground I used 4AWG. Th lenght of ground is 3 feet and it is grounded to one of the bolts that hold the seats to the floor.

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GKR

Posted By: yimke
Date Posted: July 31, 2009 at 12:16 PM

Here is a tip for next time for mounting. Cut a T shaped cut underneath the middle of the amp position. Then run your wires through that instead of one on each side. It looks better.

Posted By: rmsg0040
Date Posted: July 31, 2009 at 12:29 PM

Thanks for the tip, I think it looks good, this was only my second install.

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GKR