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Post by cheglie on Mar 5, 2014 0:09:52 GMT -5
So, I had to send my UPA-200 in for a repair. While it is gone I'm restricted to my Marantz NR1603 (50watts) to run entire system. At the same time I heard my subwoofer start to "clip" for the first time. Does less power in the receiver make the subwoofer work harder? Posssibly to the point of Over Working? I know the sub takes a load off the amp/receiver, but never thought about it the other way around?
BTW it is a powered sub Boston Aucoustic RPS-1000.
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Post by Chuck Elliot on Mar 5, 2014 0:20:03 GMT -5
So, I had to send my UPA-200 in for a repair. While it is gone I'm restricted to my Marantz NR1603 (50watts) to run entire system. At the same time I heard my subwoofer start to "clip" for the first time. Does less power in the receiver make the subwoofer work harder? Posssibly to the point of Over Working? I know the sub takes a load off the amp/receiver, but never thought about it the other way around? BTW it is a powered sub Boston Aucoustic RPS-1000. You did adjust the sub's gain? Give that you're now at 50W from the Marantz vs. 125W on the UPA-200, you've dropped 3+ dB on the mains compared to the sub. |
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Post by cheglie on Mar 5, 2014 0:32:32 GMT -5
Yes. I ran Auddesey again and adjusted levels with SPL meter. Is the sub having to compensate more for the lower power to the rest of the speakers? I actually moved my sub closer to the corner to increase the db's without going too high on the level/volume with the subwoofer. I have it back in control at the new position. Just never had any clipping previously. This is the only change I have made (removing external amp to receiver). At first I was afraid something went bad with the sub.
BTW Chuck good estimate on the db loss on the mains. Just about right!
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jlafrenz
Global Moderator 
I don't want to jump in, unless this music's thumping
Posts: 7,722
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Post by jlafrenz on Mar 5, 2014 0:32:58 GMT -5
It shouldn't because the subwoofer has its own amplification and is only receiving a line level signal. Any time that you make changes to a system, you should rerun your auto calibration or set it manually. Do this and see if you have the same issue. I would also reduce the gain on the back of the sub as Chuck has mentioned.
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Post by Gary Cook on Mar 5, 2014 1:16:44 GMT -5
My guess, you have turned the master volume up on the Marantz to compensate for its lack of watts and as a result the sub is now getting a stronger signal. I understand you that you have rerun Audyssey and balanced the SPL's, but your ears are telling you that it needs more. It may not be perceived as more volume per se, it may simply be a quest for more clarity. So you are doing some extra "compensation" perhaps without even knowing it.
Cheers
Gary
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Post by n9eryeah on Mar 5, 2014 8:33:21 GMT -5
My guess, you have turned the master volume up on the Marantz to compensate for its lack of watts and as a result the sub is now getting a stronger signal. I understand you that you have rerun Audyssey and balanced the SPL's, but your ears are telling you that it needs more. It may not be perceived as more volume per se, it may simply be a quest for more clarity. So you are doing some extra "compensation" perhaps without even knowing it. Cheers Gary +1 i think this is spot on. |
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Post by moovtune on Mar 5, 2014 11:51:42 GMT -5
+1 again. You could try lowering the preamp output to the sub (to not overdrive it's input) but then try raising the level on the sub itself to get back the low end you desire. You might be overloading the input.
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Post by cheglie on Mar 5, 2014 12:23:28 GMT -5
Thank you for all the input! That sounds reasonable to me. I was a bit surprised because I never "maxed out" one of my subs before. However, on major explosions the poor thing was making a flapping noise! It is a bit small for the size of my room, 10" sub. Room=13x20. However, it does have a decent sized amp., 500RMS watts.
I actually reduced the knob on the sub to 10:30'sh and the level in receiver is at -3.5. SPL in sync w/other speakers. I was able to reduce the volume due to tighter quarters in the corner.
I had the sub about 4ft from corner and 1 1/2 from wall. Ran it this way for over a month with the UPA-200 in the picture. Did just fine. Then when the UPA was removed (recalibrated system as well) the sub started complaining big time!
So, less volume to the main speakers without the aid of the UPA created an extra need for the sub to produce? If I interpret correctly this is what I was thinking.
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Post by Gary Cook on Mar 5, 2014 17:45:50 GMT -5
Thank you for all the input! That sounds reasonable to me. I was a bit surprised because I never "maxed out" one of my subs before. However, on major explosions the poor thing was making a flapping noise! It is a bit small for the size of my room, 10" sub. Room=13x20. However, it does have a decent sized amp., 500RMS watts. I actually reduced the knob on the sub to 10:30'sh and the level in receiver is at -3.5. SPL in sync w/other speakers. I was able to reduce the volume due to tighter quarters in the corner. I had the sub about 4ft from corner and 1 1/2 from wall. Ran it this way for over a month with the UPA-200 in the picture. Did just fine. Then when the UPA was removed (recalibrated system as well) the sub started complaining big time! So, less volume to the main speakers without the aid of the UPA created an extra need for the sub to produce? If I interpret correctly this is what I was thinking. Sort of, I think the "extra need" is from the speakers now not utilising the UPA, the additional sub volume is the by product of that, not the "extra need" itself. Cheers Gary |
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Post by garbulky on Mar 5, 2014 18:11:45 GMT -5
He's saying you subconsciously turned up the volume on the AVR to match the volume the UPA's were capable of delivering. So then you would get around the same volume for your speakers. But since the sub still has the same amp, turning the avr up resulted in turning the subwoofer volume up (though you didn't realize it). This caused the sub to run out of power.
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Post by cheglie on Mar 5, 2014 21:40:34 GMT -5
Well then. It will be interesting when I get the UPA back and in order and see how the system returns to the way it was. I hope it pans out cause as it is I have virtually no "head room" with the sub, where as before I had at least 3-4db in the "head room".
Again. Thanks for your knowlegde. Part of the fun of this hobby is definately learning new things.
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