Power amp hook up? - AVS Forum
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post #1 of 26 Old 05-01-2013, 03:03 PM - Thread Starter
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This will be a very novice question. I am thinking about doing a DIY sub and began to look at Amps. Just as an example the Behringer iNUKE NU1000 has 1/4" and XLR connections. What do you use to connect the RCA signal from your reciever In to the amp and what do you use to get the signal out to the sub?

Sorry again for the question, I have been in bands for years and never thought to use one of my friends Bass "heads" to power a home subwoofer.
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post #2 of 26 Old 05-01-2013, 03:23 PM
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You'll need to get an RCA to XLR or RCA to 1/4" stereo plug to connect the amp to your receiver. Then you'll need some simple speaker wire to go from your amp to your sub. Wire gauge will depend on the length and impedance of the sub driver. 12AWG copper should be safe for most, but 10AWG would be better.
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post #3 of 26 Old 05-02-2013, 02:07 PM
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RCA to TRS is what it's called.

I use 35ft runs of 12AWG which allows my LMS-18's to reach full excursion with 8kW iTech and clone amps, I'm sure it will be more-than-overkill for a nu-1kW.
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post #4 of 26 Old 05-02-2013, 02:37 PM
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I use the RCA - XLR adapters from parts express

the TRS ones also work fine
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post #5 of 26 Old 05-14-2013, 10:12 AM
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Purchasing the correct wire or cable is not easy. Getting the correct connectors and length you need can take a lot of time and money. Making your own cables could be a great alternative. If you need rca cable that is 8 feet long? Get the 12 gauge wire and cut it to length then put some of you favorite color of flexible sleeving on. Use heat shrink, also available in your favorite color, to connect the sleeving to the connector. You will be dang proud of those cables when you are finished! I intentionally left out some steps and procedures to make my point that "You can make your own cables!"
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post #6 of 26 Old 05-14-2013, 10:14 AM - Thread Starter
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Custom cables sounds awesome. I bet the wife would love Purple.
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post #7 of 26 Old 05-14-2013, 03:17 PM
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I also have a clarification question on this..I have heard the fans are loud on these amps...would replacing the 80mm fan with a lower rpm fan be ideal for a home setup?

Also, on the outbound connections on the iNuke 1000 there are no speaker wire outs so would you modify a cable or what would be done there to change it back to bare wire for wiring up the woofers?

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post #8 of 26 Old 05-14-2013, 04:32 PM
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mrbrace, you'll need speakon NL2FC connectors for the amplifier output and 12/2 speaker cable. If you're using binding posts on the sub/s terminate the wire with banana plugs or you can use the chassis mount female speakon connector.
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post #9 of 26 Old 05-14-2013, 04:40 PM
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Ya I saw the speakon to 1/4" connector and then was going to use a phono 1/4" from that and split off into the 12/2 wire cable but on the inuke there is not binding or banana plug option according to the screenshots...not that it matters.

I was thinking of going to epq route anyway that has terminals i can connect the speaker wire directly to...

If that all makes sense lol

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post #10 of 26 Old 05-14-2013, 04:57 PM
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Quote:
Originally Posted by mrbrace View Post

...on the inuke there is not binding or banana plug option according to the screenshots...

On the sub, not the amp. Receiver output rca>trs to inuke input. inuke output NL2FC>bananna or NL2FC depending on what input your subwoofer has.
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post #11 of 26 Old 05-14-2013, 04:59 PM
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Subwoofer has just terminals...pos and neg

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post #12 of 26 Old 05-14-2013, 05:01 PM
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I see the connector now on parts express..see the two poles...very nice this is exactly what I was looking for...thanks sir now it all makes sense smile.gif

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post #13 of 26 Old 05-14-2013, 05:09 PM
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Sure thing, man. There ya go.
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post #14 of 26 Old 05-14-2013, 05:33 PM
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I saw a pair of speakon to bananas speaker cables on either Zzounds or Sweetwater, heavy guage and low cost. Pro guys care more about functionality than the high end speaker wire companies. I side with the pro guys, so did Mr Dunlavey (a deceased high end speaker manufacturer who used normal wire at trade shows until he discovered it was hurting sales because many audiophile hear with their eyes.

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post #15 of 26 Old 05-14-2013, 05:41 PM
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I am sure they take the approach if its not broke make it look better

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post #16 of 26 Old 05-14-2013, 05:44 PM
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I had another question on the behringer power amps.

They are showing that only one channel can run a woofer or basically use the crossover. Would this matter since its controlled by my receiver anyway so I could use both outputs?

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post #17 of 26 Old 05-14-2013, 05:57 PM
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Quote:
Originally Posted by mrbrace View Post

I had another question on the behringer power amps.

They are showing that only one channel can run a woofer or basically use the crossover. Would this matter since its controlled by my receiver anyway so I could use both outputs?

For the inuke1000, ya, probably only one sub per channel. It's rated for ~300w x2 into 4ohms. I'm running dual Emminence mfw-15 drivers and their power handling is only about 250w.

Depends on the sub you' reusing, really. It doesn't matter to the inuke, your receiver's crossover will only allow frquencies below that setting to go to your amp and sub, if it's 80hz, then everything below that. Is that what you meant?
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post #18 of 26 Old 05-14-2013, 06:04 PM
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You can also run one sub off the inuke in Bridged mono at ~1000w into 4ohms...or if you had two dual voice coil subs you could wire series/parallel for 4ohm. etc, etc.
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post #19 of 26 Old 05-14-2013, 06:05 PM
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With Behringer, like most brands, be sure to download the manual and carefully review the specs. Behringer provides RMS numbers, which are significantly lower than the numbers posted on websites. However, all brands do this to some degree. For many you want to look at distortion numbers from 20 Hz to 20 kHz, which again will be lower than the touted power specs.

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post #20 of 26 Old 05-14-2013, 06:34 PM
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Oh I was thinking the EPQ1200

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post #21 of 26 Old 05-14-2013, 06:42 PM
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Quote:
Originally Posted by robotbunny View Post

You can also run one sub off the inuke in Bridged mono at ~1000w into 4ohms...or if you had two dual voice coil subs you could wire series/parallel for 4ohm. etc, etc.

How would you bridge that amp with the connections it has there...forgive my ignorance I am used to car amps and such so this is slightly different.

My initial thought is that I flip that bridge switch and just run with the one connection and use either output? Or get two of the NL2FC connectors and wire one positive and one negative from each output (like a car amp) and that would bridge it?

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post #22 of 26 Old 05-14-2013, 06:53 PM
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No problem. The wiring for the spaekon connectors is printed on the back of the amp chassis. For Ch. A, wire a male speakon connector using the 1+ positive and 1- negative. For Ch. B, wire it 2+ 2-. For Bridge mode, use a speakon NL4FC and wire it 1+ 2+ and use the B amp channel.
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post #23 of 26 Old 05-14-2013, 06:54 PM
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Quote:
Originally Posted by robotbunny View Post

No problem. The wiring for the spaekon connectors is printed on the back of the amp chassis. For Ch. A, wire a male speakon connector using the 1+ positive and 1- negative. For Ch. B, wire it 2+ 2-. For Bridge mode, use a speakon NL4FC and wire it 1+ 2+ and use the B amp channel.

Whats funny is your so right is says right there on the back but I couldn't make heads or tails of it for some reason...

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post #24 of 26 Old 05-14-2013, 07:06 PM
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Any one know what the amp draw is on those bridged like that at 1000W?

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post #25 of 26 Old 05-15-2013, 09:27 AM
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Well, assuming you have a good 120V line and 90% efficiency the amp will be drawing 9.26A to deliver a constant 1000W.

(1000W/120V)/.9= 9.26A
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post #26 of 26 Old 05-15-2013, 10:19 AM
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Quote:
Originally Posted by duc135 View Post

Well, assuming you have a good 120V line and 90% efficiency the amp will be drawing 9.26A to deliver a constant 1000W.

(1000W/120V)/.9= 9.26A

Awesome thanks...In all reality I am looking to possible get another 15" sealed sub to go along with my 15" ported sub setup and get a EPQ1200 to power them both...they are so close in price and it just makes cents smile.gif

I am looking to purchase it and then ask forgiveness from the wife later...

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