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post #1 of 26 Old 11-30-2012, 06:54 AM - Thread Starter
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Good morning everyone,

I just took receipt of a new Behringer EPX4000 amp and was looking to use the miniDSP to handle the EQing, however, I don't know which one to buy.

The input sensitivity of the amp appears to be 1V and my options for output are either .9 or 2. The question I have is how much am I really losing if I get the unbalanced that outputs .9, thats 10%, but is that really enough to fret at? The alternative would be the balanced version which would 2v output. Would that overpower and send my amp into clipping or will it only draw the 1v it requires? Any help would be greatly appreciated. Thanks.

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post #2 of 26 Old 11-30-2012, 08:10 AM
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Quote:
Originally Posted by kcnitro07 View Post

Good morning everyone,

I just took receipt of a new Behringer EPX4000 amp and was looking to use the miniDSP to handle the EQing, however, I don't know which one to buy.

The input sensitivity of the amp appears to be 1V and my options for output are either .9 or 2. The question I have is how much am I really losing if I get the unbalanced that outputs .9, thats 10%, but is that really enough to fret at?

Use the 2V output setting and run it a few dB below that to match the amplifier's input. No significant loss. It's always better to try to run outputs a few dB below max as opposed to a few dB above... ;-)

As far as clipping the EPX 4000 goes, you seem to be highly confused. The master volume control in your system still rules that. Besides haven't you noticed that the Behringer has its own input level controls? The input sensitivity of the amp is only below 2 volts if you keep the little knobs most or all of the way up. Back them off to about 70, and you're as matched as you could ever hope for.

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post #3 of 26 Old 11-30-2012, 08:20 AM
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Originally Posted by kcnitro07 View Post

Good morning everyone,

I just took receipt of a new Behringer EPX4000 amp and was looking to use the miniDSP to handle the EQing, however, I don't know which one to buy.

Buy the balanced one. It has more signal, less noise. The unbalanced one only puts out .9Vrms no matter what the input setting is. The "2V" jumper just attenuates the input signal by 3dB.

Only drawbacks are that the unbalanced one has a sleeker-looking case, and it needs a 12V wall-wart (can't just be powered from the USB port).

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post #4 of 26 Old 11-30-2012, 11:50 AM
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Originally Posted by DS-21 View Post

Buy the balanced one. It has more signal, less noise. The unbalanced one only puts out .9Vrms no matter what the input setting is. The "2V" jumper just attenuates the input signal by 3dB.
Only drawbacks are that the unbalanced one has a sleeker-looking case, and it needs a 12V wall-wart (can't just be powered from the USB port).

Just to clarify, its the balanced model that requires a 12 volt supply. It can also be used as a unbalanced to balanced converter.
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post #5 of 26 Old 11-30-2012, 02:29 PM - Thread Starter
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The balanced version comes with the connectors needed to plug into it?

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post #6 of 26 Old 11-30-2012, 02:56 PM
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yes it does.
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post #7 of 26 Old 11-30-2012, 07:16 PM - Thread Starter
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Ordered, from hong kong? How long will that shipping take?

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post #8 of 26 Old 12-01-2012, 01:09 AM
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It takes one to two weeks depending how long it takes for the order to be processed.
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post #9 of 26 Old 12-01-2012, 06:40 AM - Thread Starter
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That's encouraging, I ordered another item frm China and shipping time was quoted at a month and a half frown.gif

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post #10 of 26 Old 12-01-2012, 10:57 AM
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Quote:
Originally Posted by kcnitro07 View Post

Ordered, from hong kong? How long will that shipping take?

IIRC, I had my last order from them (an 8x8, their box for the 8x8, and two balanced 2x4s) in the Southeast in roughly a week.

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post #11 of 26 Old 12-01-2012, 02:45 PM
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There is a dedicated thread on the miniDSP in the DIY Forum that may be helpful.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #12 of 26 Old 12-01-2012, 10:10 PM - Thread Starter
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I read part of it, unfortunately my patience for arguments that are off topic and pointless isn't very high so I turned away. Whence it gets here I am sure I will go back there and look for usable information. Thanks

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post #13 of 26 Old 12-02-2012, 01:36 AM
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Quote:
Originally Posted by kcnitro07 View Post

I read part of it, unfortunately my patience for arguments that are off topic and pointless isn't very high so I turned away. Whence it gets here I am sure I will go back there and look for usable information. Thanks

I can't see any harm in starting a new thread if that's what is needed. If you have any questions just let me know.
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post #14 of 26 Old 12-02-2012, 10:35 AM - Thread Starter
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Thank you Theresa

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post #15 of 26 Old 12-08-2012, 11:01 AM - Thread Starter
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So I got the little burger today and I feel like a complete ******. I'm following the manual and haven't gotten very far. First off, it says it comes with a 1x3 rca cable.....I don't see that in the box, but beyond that, I can't get it to power on. I have plugged it into a USB 2.0 port on my PC and into the MiniDSP with the supplied cable and nothing is happening. It sounded like you didn't need the external power, that the device would be powered off USB only. Is this not true?

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post #16 of 26 Old 12-08-2012, 11:15 AM - Thread Starter
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NVM, apparently USB isn't enough to power it, I have plugged in an external power supply nad it appears to be working.

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post #17 of 26 Old 12-08-2012, 11:39 AM
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Is it the balanced miniDSP?
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post #18 of 26 Old 12-08-2012, 12:02 PM - Thread Starter
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Is it the balanced miniDSP?

Yes balanced. I am to take it that you have to split open some RCAs and match up cables to plug into this thing eh?

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post #19 of 26 Old 12-08-2012, 12:13 PM - Thread Starter
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hahah saturday morning distracted by children....I was looking at the wrong manual, that has been corrected now. THanks.

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post #20 of 26 Old 12-08-2012, 12:33 PM
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Quote:
Originally Posted by kcnitro07 View Post

NVM, apparently USB isn't enough to power it, I have plugged in an external power supply nad it appears to be working.

USB ports vary in terms of how much current they can actually provide. There are no global rules, but laptop USB ports seem to be more likely to be current-challenged.
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post #21 of 26 Old 12-08-2012, 12:42 PM - Thread Starter
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So I have it hooked up, I spliced a rca cable into the input 1, its unbalanced so I jumpered the - over to the S and did the same on output 1. PLugged the Input 1 into SW out on my Onky and Output 1 into the Channel 1 of my EPX4000 with it set to mono and now I get no sound out of my subs at all....did I do something wrong. I did practice with a cheapo real thin set of RCAs I had laying around before cutting into my $10 monoprice RCA cable. Any thoughts?

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post #22 of 26 Old 12-08-2012, 01:11 PM - Thread Starter
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I went ahead and upgraded my RCA cable to a nice big thick peavey cable I had laying around just in case. Same issue. On the input RMS meter I'm getting -75 dBFS at max regardless of what volume my SW channel is at.

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post #23 of 26 Old 12-08-2012, 02:36 PM - Thread Starter
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So I realized I was still using a 5V power supply so I picked a 12V and hooked it up, same issue...any one have any idea why its not working??

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post #24 of 26 Old 12-08-2012, 03:06 PM
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Are you getting sound out of the unit?
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post #25 of 26 Old 12-08-2012, 03:19 PM - Thread Starter
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yes I realized it was working, just really quiet. If I graph with REW the graphs are identical, except with the miniDSP in the chain its 10 dB quieter. The peak of the graph without the miniDSP in the picture peaks at 98 dB (uncalibrated so that is probably not the true spl) When I add the miniDSP and leave everything else the same, it peaks at 87 dB. Which means to get the same output I have to turn the SW lvl up to +4. Once I start EQing I will likely have to go even higher than that in order to get anything worth listening to.

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post #26 of 26 Old 12-08-2012, 03:22 PM - Thread Starter
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I actually only had to go up to -1 from -6 on the SW to get the same volume as if I didn't have the miniDSP in the loop. Is this expected?

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