View Full Version : Eliminate movie music boom?


fesslercw
06-23-09, 01:55 PM
Apologies if this has been asked, couldn't find anything related on a search.

Is there a way/setup/config to help eliminate massive bass volume increase from sub when music is featured in a movie playback? I have it crossed over at 60 to compensate for the lower end of my bookshelfs which are crossed at 80.
Any suggestions? Thanks!

sivadselim
06-23-09, 02:11 PM
I have it crossed over at 60 to compensate for the lower end of my bookshelfs which are crossed at 80.Could you explain what you mean by this, exactly? How are you low passing your sub at a different frequency (60Hz) than you are high passing (80Hz) your speaker? And why? It's most likely NOT what you are doing, but even if it were, it would create a hole in your response between 60Hz and 80Hz.

craig john
06-23-09, 02:19 PM
Is there a way/setup/config to help eliminate massive bass volume increase from sub when music is featured in a movie playback?
Yes, calibrate your system.

I have it crossed over at 60 to compensate for the lower end of my bookshelfs which are crossed at 80.
:eek:

Any suggestions?
Yes, don't do that! ^

mcjasonb
06-23-09, 02:21 PM
how are you crossing the sub at 60 and the mains at 80? if you are crossing the mains at 80 with the receiver and then the sub at 60 with the crossover dial on the sub that is a bad idea for movies.

fesslercw
06-23-09, 02:33 PM
I am new to this and heard this would be the place to ask... some patience would be appreciated from the other posters.

how are you crossing the sub at 60 and the mains at 80? if you are crossing the mains at 80 with the receiver and then the sub at 60 with the crossover dial on the sub that is a bad idea for movies.


McJasonb,
Yes, I am crossing the mains with the reciever and the sub via dial. Can you reccomend a better setup? I understand all speakers are different and all that, but an avg set of crossover points/config, maybe?

Thanks.

mcjasonb
06-23-09, 02:36 PM
I am new to this and heard this would be the place to ask... some patience would be appreciated from the other posters.




McJasonb,
Yes, I am crossing the mains with the reciever and the sub via dial. Can you reccomend a better setup? I understand all speakers are different and all that, but an avg set of crossover points/config, maybe?

Thanks.

the problem with doing that, is that the LFE channel in any 5.1 soundtrack is going to cover 120hz and under. so if you cut off everything above 60hz then you are missing half of the LFE channel.

doing what you are doing could possibly work well for music, it is just a bad idea for movies.

jaejw1
06-23-09, 02:48 PM
calibrated the sub level to the rest of THE system

relocate the sub in a different area of THE room if u havent already found the best sounding spot for it ,,, subwoofer crawl

set sub amp crossover to its highest point,, let the rcvr xover do all the work,,,

where is ur sub located ????

fesslercw
06-23-09, 02:49 PM
the problem with doing that, is that the LFE channel in any 5.1 soundtrack is going to cover 120hz and under. so if you cut off everything above 60hz then you are missing half of the LFE channel.

doing what you are doing could possibly work well for music, it is just a bad idea for movies.

Gotcha,
appreciate the help.

swgiust
06-23-09, 02:54 PM
First, if you are using bookshelf speakers, set your cross over in your reciever at 80 or higher. Make sure all your speakers are set to small.

Turn the cross over knob of the sub up all the way.

Next, use your recievers test tone. The volume coming out of all the speakers, one at a time, and the volume coming out of the sub should be the same. Using a sound level meter is very helpful. Buy if you don't have one, you can try it by ear.

I am guessing that you have your sub set way to hot. When you play normal music it doesn't kick in, but when you play a movie with a 5.1 soundtrack,it is sending the bass to the sub.

fesslercw
06-23-09, 03:03 PM
First, if you are using bookshelf speakers, set your cross over in your reciever at 80 or higher. Make sure all your speakers are set to small.

Turn the cross over knob of the sub up all the way.

Next, use your recievers test tone. The volume coming out of all the speakers, one at a time, and the volume coming out of the sub should be the same. Using a sound level meter is very helpful. Buy if you don't have one, you can try it by ear.

I am guessing that you have your sub set way to hot. When you play normal music it doesn't kick in, but when you play a movie with a 5.1 soundtrack,it is sending the bass to the sub.

Thanks for the advice swguist, I'll give this a go

jaejw1
06-23-09, 03:17 PM
where is ur sub located

Erik Tracy
06-23-09, 03:36 PM
Depending on the AVR, you may have a setting for "Night Time" or Dynamic Limiting. This may help reduce the volume impact for loud sub/lfe levels during movies.

fwiw,
Erik

sivadselim
06-23-09, 03:46 PM
the problem with doing that, is that the LFE channel in any 5.1 soundtrack is going to cover 120hz and under. so if you cut off everything above 60hz then you are missing half of the LFE channel.That's but one concern. If the receiver's crossover is set to 80Hz but the subs own low-pass is set to 60Hz then, short of room gain and the filter's slopes (which are now cascaded), you are eliminating reproduction of any rerouted bass between 60Hz and 80Hz. The interaction of the two low-pass filters creates other issues, too.

That said, that may have noting at all to do with the boominess. Everything else left the same, the boominess may actually get worse with the sub's low-pass set to max (or bypassed). As others have suggested, you need to also calibrate the system correctly.

What sub is this, btw?

fesslercw
06-24-09, 09:35 AM
That's but one concern. If the receiver's crossover is set to 80Hz but the subs own low-pass is set to 60Hz then, short of room gain and the filter's slopes (which are now cascaded), you are eliminating reproduction of any rerouted bass between 60Hz and 80Hz. The interaction of the two low-pass filters creates other issues, too.

That said, that may have noting at all to do with the boominess. Everything else left the same, the boominess may actually get worse with the sub's low-pass set to max (or bypassed). As others have suggested, you need to also calibrate the system correctly.

What sub is this, btw?

It's an older model AR 12" of which I plan on replacing soon from something from Dr. Hsu, though I've not yet decided what. I placed the sub crossover as high as it would go, 120hz I believe. I also "turned down" the sub output on my AVR.

I saw an imporvement for sure, but movie music still gets swallowed in bass.