You can connect a subwoofer output to a pro amp. 1/4" to RCA works

 



Quote:
Originally Posted by MichaelJHuman /forum/post/21765054


You can connect a subwoofer output to a pro amp. 1/4" to RCA works

Thanks.

Any pros or cons to doing this?

 

That phone jack is balanced. There's an internal switch to adjust the sensitivity. Since home hi-fi is generally -10dbm and balanced pro equipment is generally +4dbm, you will probably have to adjust the sensitivity to get proper output.

 



Quote:
Originally Posted by DankNuggz /forum/post/21765063


Thanks.

Any pros or cons to doing this?

No. I'm using a Crown amp that way right now. I've tried both the 1/4" to RCA adapters (which you can find at RadioShack for $2) and the Hosa XLR to RCA adapters (which I got at Amazon for $4)... they both work well.


As for level matching the pro-amp input to the receiver output, I've never had any issues. If I set my volume knobs on my pro-amps (Crown and Behringer) to 1/3rd of the way up, the auto-calibration on my receivers (Pioneer and Denon) end up being about zero.

However, I usually turn the volume knob on my pro-amps down to about 1/4 of the adjustment range, so my receiver output is +5 to +10 (the limit is +12)... I like to run pre-outs hot to reduce the effect of noise picked up by the unbalanced RCA cables... not that it matters much, the noise is very little on my short runs.


Hope that wasn't too confusing. I like using pro-amps in my home theater, they are great bang for the buck, and are especially suited for subwoofer use, with their vast power on tap.

 



Quote:
Originally Posted by S_rangeBrew /forum/post/21765276


No. I'm using a Crown amp that way right now. I've tried both the 1/4" to RCA adapters (which you can find at RadioShack for $2) and the Hosa XLR to RCA adapters (which I got at Amazon for $4)... they both work well.


As for level matching the pro-amp input to the receiver output, I've never had any issues. If I set my volume knobs on my pro-amps (Crown and Behringer) to 1/3rd of the way up, the auto-calibration on my receivers (Pioneer and Denon) end up being about zero.

However, I usually turn the volume knob on my pro-amps down to about 1/4 of the adjustment range, so my receiver output is +5 to +10 (the limit is +12)... I like to run pre-outs hot to reduce the effect of noise picked up by the unbalanced RCA cables... not that it matters much, the noise is very little on my short runs.


Hope that wasn't too confusing. I like using pro-amps in my home theater, they are great bang for the buck, and are especially suited for subwoofer use, with their vast power on tap.

Thanks for the explaination.

I wish I wouldn't have bought this plate amp.

 

RCA to 1/4" should be unbalanced. It's either mono (only two contacts) or two wires are tied together.


Yes 1/4" jacks CAN be balanced, but they can also be unbalanced (as an RCA to 1/4" cable should be.)


That's how I did it with a Mackie, and it worked perfectly

 

I found this on ebay http://www.ebay.com/itm/Crown-Power-...4#ht_500wt_969





He said the amp has been serviced and a new filter put in.


I say that to ask when I look at this one on craigslist, is there any signs or anything

that will let me know if it's not in 100% working condition other than an o-scope.

 

is shipping high for it? I hear people like the crown xls100 on amazon.com for under 300.

 

 http://www.amazon.com/Crown-XLS1000-...1526774&sr=8-1


A guy on amazon said More than a studio or gigging amp,

I've noticed that there's a bit of controversy about the use of pro amps in home audio systems. The concern is that your home pre-amp or pre-out (on your receiver or integrated amp) does not output a strong enough signal for professional amps like the XLS 1000. My SP9II happens to work fine with this Crown amp. The trick--according to an audio geek called Wayne Pflughaupt on Home Theater Shack, where he's written a veritable dissertation on the subject--is making sure your pre's output is equal to or greater than the sensitivity of the amp's input. In my case, the SP9II outputs 2 Vrms while the XLS 1000 has a sensitivity of 1.4 Vrms. So I'm good

he replaced his nad that failed on him after several years with this

 



Quote:
Originally Posted by DankNuggz /forum/post/21765806


I found this on ebay.....

Just get a Behringer EP4000. They can be had for $300 or less shipped. Brand New. They have been tested and used by people on this board and others and stood the test of time for almost 10 years now. I looked for 7 YEARS for a better deal than the EP4000, and couldn't find one.


And don't worry about hooking the pro-amp to your receiver. It's not a problem. People who have had issues with that have used bad cables or had their volume knobs turned down.


Oh, and those lightweight Class-D amps are crap for powering subwoofers, nice heavy A/B amps like the EP4000 are the only way to go. Tests have proven even the multi-thousand dollar Lab-Gruppen Swedish-Made amps, (which fanbois around here fawn over) fall on their face when presented with an extended amount of bass use. Go Heavy or Go Home.

 



Quote:
Originally Posted by S_rangeBrew /forum/post/21773149


Just get a Behringer EP4000.

And don't worry about hooking the pro-amp to your receiver. It's not a problem. People who have had issues with that have used bad cables or had their volume knobs turned down.


Oh, and those lightweight Class-D amps are crap for powering subwoofers, nice heavy A/B amps like the EP4000 are the only way to go. Tests have proven even the multi-thousand dollar Lab-Gruppen Swedish-Made amps, (which fanbois around here fawn over) fall on their face when presented with an extended amount of bass use. Go Heavy or Go Home.

Thanks man.

The Ep4000 brand new sounds like the way to go.



I do have another question.

Is the Ep4000 1 ohm stable?

I have a Rockford Fosgate T215D2 Dual 2ohm thats in my car that I'm interested in hearing as a home theater sub.


Anyone recall a thread using this sub for home theater?

 



Quote:
Originally Posted by DankNuggz /forum/post/21773571


Thanks man.

The Ep4000 brand new sounds like the way to go.



I do have another question.

Is the Ep4000 1 ohm stable?

I have a Rockford Fosgate T215D2 Dual 2ohm thats in my car that I'm interested in hearing as a home theater sub.


Anyone recall a thread using this sub for home theater?

From everything I have heard, it's not. In fact people have the least amount of issues when they run it in 8ohm bridged or 4 or 8 ohm stereo. It runs in 4ohm bridged and 2ohm stereo, but if you really press it in those modes, it won't always put out it's rated power.


As for home theater, many of us are using them for subwoofer amps and for regular speakers.


Here is a thread on the EP4000: http://www.avsforum.com/avs-vb/showt...ghlight=ep4000


You can also search for Ep2500, which was the old version, which was the same exact thing, with a different lable.


Here is the amp bench test thread, which shows how much power these thing really put out.... the Behringer EP2500/Ep4000 did very well.
http://www.avsforum.com/avs-vb/showthread.php?t=855865


I use all my amps in 8ohm mode. I buy really big amps.