Fired up my Full Marty for the first time and had almost no volume.

Your receiver doesn’t pump out enough voltage to the LFE out for the pro amp which wants a stronger signal. You either get something in between the amp and the Denon or you adjust your LFE out to a higher output through your receivers settings.

When I adjusted the settings it needed to be at least +9db on the LFE channel before I could get a strong enough signal to power the amp.


Sent from my iPhone using Tapatalk

The RCA signal and XLR signal are two different types of signals. The RCA is unbalanced(consumer) and the XLR is balanced(pro). Try using a RCA to 1/4” TS cable and plug it into the center of the input jack. Should work fine. That’s how I have my QSC connected and didn’t have to boost any signals or use anything like a clean box to match signals.

I use an RCA to XLR adapter with no issues. Typically the level on my LFE channel in the AVR (Denon 2500h) is set to -6. I do not see the Denon or adapter being the issue. What are your input gains set at? What is the source of your test tones? When you play the test tones have you looked at the input and output meters in the Behringer software? My guess is your gains are just set low on the amp, or your test tones are very low level (I'd recommend at least -10dbfs).

keylight93 said:

The RCA signal and XLR signal are two different types of signals. The RCA is unbalanced(consumer) and the XLR is balanced(pro). Try using a RCA to 1/4” TS cable and plug it into the center of the input jack. Should work fine. That’s how I have my QSC connected and didn’t have to boost any signals or use anything like a clean box to match signals.

Click to expand...

I am very impressed with your post count to join date ratio!

Thalguy said:

I have the sub plugged into channel A on the Beheinger and the volume know turned roughly half way.

Click to expand...

I assume by this you mean the knobs on the front. These are not volume, but attenuation, regulating the amount of input received from your AVR.

Turn the appropriate knob up to ~9:00. If still not enough, like Trimlock said, look into something like a Cleanbox Pro. Although I've never had an issue getting my Denons/Marantz to drive a Behringer to full capacity.

Trimlock said:

Your receiver doesn’t pump out enough voltage to the LFE out for the pro amp which wants a stronger signal. You either get something in between the amp and the Denon or you adjust your LFE out to a higher output through your receivers settings.

When I adjusted the settings it needed to be at least +9db on the LFE channel before I could get a strong enough signal to power the amp.


Sent from my iPhone using Tapatalk

Click to expand...

I think I was at +6 dB before I heard anything and then it was faint.

smcmillan2 said:

I assume by this you mean the knobs on the front. These are not volume, but attenuation, regulating the amount of input received from your AVR.

Turn the appropriate knob up to ~9:00. If still not enough, like Trimlock said, look into something like a Cleanbox Pro. Although I've never had an issue getting my Denons/Marantz to drive a Behringer to full capacity.

Click to expand...

I will do that now. Thanks.

squiers007 said:

I use an RCA to XLR adapter with no issues. Typically the level on my LFE channel in the AVR (Denon 2500h) is set to -6. I do not see the Denon or adapter being the issue. What are your input gains set at? What is the source of your test tones? When you play the test tones have you looked at the input and output meters in the Behringer software? My guess is your gains are just set low on the amp, or your test tones are very low level (I'd recommend at least -10dbfs).

Click to expand...

I will have to connect to the amp and see what those gains are set to.

When I turned attenuation to 9 I did get considerably more sound, which is a good sign.

One bad thing is that the cone sounded like it was doing something weird. Not every note, and it was faint. It wasn't a metallic sound, and not a rattle. I do have a high pass filter set and it was making the noise at low volume during music.

The driver now has about 5 minutes of use so is it part of a small break-in period?

Thalguy said:

I will have to connect to the amp and see what those gains are set to.

When I turned attenuation to 9 I did get considerably more sound, which is a good sign.

One bad thing is that the cone sounded like it was doing something weird. Not every note, and it was faint. It wasn't a metallic sound, and not a rattle. I do have a high pass filter set and it was making the noise at low volume during music.

The driver now has about 5 minutes of use so is it part of a small break-in period?

Click to expand...

Once you get connected and pull up the software play the tones you were using and look at the input meter.

You mention several different levels so I want to be sure we are all on the same page. It sounds like you have the LFE signal set to +6 in the AVR settings and the amp input knob on the front of the amp is at 9 o'clock? Is this pre or post Audyssey? What is your main volume at when doing the tones?

I want to say my input gains (knobs on the front) are setup around 11 o'clock if I'm remembering correctly. Also, I think 7 o'clock is the lowest setting and 4 o'clock is the highest so you've still got it set pretty low if it's at 9 o'clock.

Curious if you can describe this sound a bit more. Maybe take a short video if you can. What is your HPF set at?

squiers007 said:

I want to say my input gains (knobs on the front) are setup around 11 o'clock if I'm remembering correctly. Also, I think 7 o'clock is the lowest setting and 4 o'clock is the highest so you've still got it set pretty low if it's at 9 o'clock.

Click to expand...

D'oh! Yeah, my bad, I meant ~3:00 (as in: Turn it up, clockwise). Sorry...

smcmillan2 said:

D'oh! Yeah, my bad, I meant ~3:00 (as in: Turn it up, clockwise). Sorry...

Click to expand...

I understood what you meant.

squiers007 said:

Once you get connected and pull up the software play the tones you were using and look at the input meter.

You mention several different levels so I want to be sure we are all on the same page. It sounds like you have the LFE signal set to +6 in the AVR settings and the amp input knob on the front of the amp is at 9 o'clock? Is this pre or post Audyssey? What is your main volume at when doing the tones?

I want to say my input gains (knobs on the front) are setup around 11 o'clock if I'm remembering correctly. Also, I think 7 o'clock is the lowest setting and 4 o'clock is the highest so you've still got it set pretty low if it's at 9 o'clock.

Curious if you can describe this sound a bit more. Maybe take a short video if you can. What is your HPF set at?

Click to expand...

My subwoofer, under levels, is set to + 6db.

The test tones I was referring to are coming from the receiver under the levels.

I believe my receiver was set at -30 dB.

My attenuation knob is on the ninth dot from the left.

I can record a video but I won't be home until after work.

I followed the instructions on GSG's site to set my filter. Link

Wait . . .are you referring to running test tones?

You should be setting your AVR to reference (0.0dB) if you're running test tones. An NX6000, while not a crazy amp, is still putting out quite a bit of power per channel. You shouldn't have to boost your subwoofer channel, at all, in the AVR. Not even slightly.

There's something very wrong with your configuration if you're still not getting proper output.

Thalguy said:

My subwoofer, under levels, is set to + 6db.

The test tones I was referring to are coming from the receiver under the levels.

I believe my receiver was set at -30 dB.

My attenuation knob is on the ninth dot from the left.

I can record a video but I won't be home until after work.

I followed the instructions on GSG's site to set my filter. Link

Click to expand...

To clarify, " ninth dot from the left" is 9 o'clock? Is so then I think this is likely the source of your issues.

I'd recommend the following: set LFE level to 0, unhook subwoofer from amp, play the level tone at 0 on the AVR, adjust dial on front so that the input meter in the Behringer software is just under clipping or 0db.

This will get you a full/unclipped signal to your amp at a system volume of 0. Again, be sure you're looking at the input, not the output. From here run Audyssey and see where it sets the level relative to your other speakers. If it sets it at -12, then turn the input knob down a little and re-run. I usually like to end up between -8 to -6. This allows me to turn things up and down a bit, depending on the content I'm playing, and know that I'm over driving my amp (unless you go over 0).

Other's may have different methods, but this has worked well for me.

I have a Denon x3400h with a similar setup to yours. I set the attenuation knob all the way clockwise. I've run the receiver past 0db as a stress test of the subs and still not clipped the amp. I'd just turn it all the way up if I were you, though squiers007's method is a bit more scientific.

If you are refering to your room correction setup test tones then they are very very quiet.
Try a movie with bass.

thebudgetaudiophile said:

Wait . . .are you referring to running test tones?

You should be setting your AVR to reference (0.0dB) if you're running test tones. An NX6000, while not a crazy amp, is still putting out quite a bit of power per channel. You shouldn't have to boost your subwoofer channel, at all, in the AVR. Not even slightly.

There's something very wrong with your configuration if you're still not getting proper output.

Click to expand...

Yes, I guess I am referring to test tones.

Somewhere along the line the subwoofer is not receiving enough power. The cone barely moves and the minimal sound it does produce is not super clean.

I suspect I have a bad software setting in the amp or one of my cables is not built right.

Could a cable issue cause this problem? Or would it be more likely that I just wouldn't get sound?

squiers007 said:

To clarify, " ninth dot from the left" is 9 o'clock? Is so then I think this is likely the source of your issues.

I'd recommend the following: set LFE level to 0, unhook subwoofer from amp, play the level tone at 0 on the AVR, adjust dial on front so that the input meter in the Behringer software is just under clipping or 0db.

This will get you a full/unclipped signal to your amp at a system volume of 0. Again, be sure you're looking at the input, not the output. From here run Audyssey and see where it sets the level relative to your other speakers. If it sets it at -12, then turn the input knob down a little and re-run. I usually like to end up between -8 to -6. This allows me to turn things up and down a bit, depending on the content I'm playing, and know that I'm over driving my amp (unless you go over 0).

Other's may have different methods, but this has worked well for me.

Click to expand...

If it were a clock I would have the dial turned to about 4 o'clock. One of the first suggestions was to turn the attenuation up. Originally O had it pointed at roughly 9 o'clock and had no sound. As I turned it clockwise it got louder and now I have it set pointing to roughly 4 o'clock.

My knob looks to be in roughly the same position as the image on the Behringer site.

Link

One thing I noticed is that my signal light comes on, but nothing above it.

Thalguy said:

If it were a clock I would have the dial turned to about 4 o'clock. One of the first suggestions was to turn the attenuation up. Originally O had it pointed at roughly 9 o'clock and had no sound. As I turned it clockwise it got louder and now I have it set pointing to roughly 4 o'clock.

My knob looks to be in roughly the same position as the image on the Behringer site.

Link

One thing I noticed is that my signal light comes on, but nothing above it.

Click to expand...

That position should be plenty to drive the amp to full output. Where does the AVR set the sub when you run Audyssey?