Any suggestions to for my SVS

[moreira85]

I love my SVS sub. What i noticed the other day is that when i am sitting about 5 feet away from my sub or closer while watching TV or listening to music the thump is just incredible even at low volumes. when i go to my listening position I cant really hear the bass of the sub. when i turn it up during movies obviously the house shakes.
Just seems as though not getting the optimal effect from my listening postion. I have it set up appropriately, all set to small, crossed at 80 in reciever and crossover on sub set to max. All speakers calibrated with SPL to 75 and sub at 78. How can i test to see if the Sub has a dead spot in my room? I have 24X16 room and sub is set in the corner.
I moved the sub to right corner of the room and cleaned up wires since this photo

http://i286.photobucket.com/albums/ll82/moreira85/new set up/pics004.jpg

http://i286.photobucket.com/albums/ll82/moreira85/new set up/pics003.jpg

 

[bandphan]

I love my SVS sub. What i noticed the other day is that when i am sitting about 5 feet away from my sub or closer while watching TV or listening to music the thump is just incredible even at low volumes. when i go to my listening position I cant really hear the bass of the sub. when i turn it up during movies obviously the house shakes.
Just seems as though not getting the optimal effect from my listening postion. I have it set up appropriately, all set to small, crossed at 80 in reciever and crossover on sub set to max. All speakers calibrated with SPL to 75 and sub at 78. How can i test to see if the Sub has a dead spot in my room? I have 24X16 room and sub is set in the corner.
I moved the sub to right corner of the room and cleaned up wires since this photo

http://i286.photobucket.com/albums/ll82/moreira85/new set up/pics004.jpg

http://i286.photobucket.com/albums/ll82/moreira85/new set up/pics003.jpg

Check the phase postion as a "quick" fix, or start the crawl

 

[nibhaz]

Based on the description of your situation, it would appear that your listening position is sitting in a null do to excited room modes. The increase bass you hear as you approach the sub and thusly a wall is know as boundary reinforcement. This is a common problem for many people.

The cheapest way to help combat this is the crawling for base method already suggested by bandphan. This is the best you can do without going to more drastic methods.


After crawling for bass your options are acoustical treatments, and EQing.

 

[GlocksRock]

Try moving the sub to a different location if possible.

 

[moreira85]

is the crawling method the best way or the cheapest way. I am looking for the right way. Also do i have to put this massive beast on my couch?
how is the EQing method.

 

[moreira85]

Try moving the sub to a different location if possible.

i will try but i am pretty limited to left or right corner, otherwise it will be in the middle of the right wall. I will experiment. Are there any test that can be done to confirm that it is in a null.

 

[popotoys]

Have you tried moving it out from the corner a little or changing the direction that it is pointing slightly?

 

[bandphan]

Without taking mesurements from the listening position, crawl is the easiest. Check the phase to see if it will fill the null. (temporary solution to a room problem)

 

[moreira85]

tuning

hi have one port plugged. think removing it and changing the tuning will help any? currently if i sit 5 feet away then move back to listening position it drops 10 db on spl.

 

[Adam]

Sorry, but I don't remember which model you have. Does it have the PEQ on the amp?

The way that I checked the frequency response of my sub at different positions was to use a set of test tones (I used a CD from AV123 that cost $5, but you can also download those tones off the internet) and an SPL meter. I measured the output at various frequencies to figure out where my nulls and bumps were located.

 

[Davemcc]

The PEQ will be able to tame the peaks but will have no effect on nulls. Same with any other type of active EQ.

Changing the location of the sub or adding bass traps are the most effective way of dealing with nulls.

 

[jeffsg4mac]

Unfortunately like others have said you are sitting in a null. Moving the sub may shift the null to another seating position but it will still be a compromise. This is one of the drawbacks of a single sub. Room treatments would be your best solution and/or getting a second sub.

 

[moreira85]

Sorry, but I don't remember which model you have. Does it have the PEQ on the amp?

The way that I checked the frequency response of my sub at different positions was to use a set of test tones (I used a CD from AV123 that cost $5, but you can also download those tones off the internet) and an SPL meter. I measured the output at various frequencies to figure out where my nulls and bumps were located.

no PEQ on mine, have the pb12+2 and the black ash doesnt come with PEQ. I plan on plotting at differ frequencies. Any suggestions on how to plot? any graphs that i could plot it on?

 

[Adam]

Any suggestions on how to plot? any graphs that i could plot it on?

I used Excel to do my plots. It's easy to make plots in that program. Do you have Excel? If not, there are others out there that you can get for free such as OpenOffice.

 

[moreira85]

yes i have excel. do you just plot hz to dbs?

 

[Adam]

yes i have excel. do you just plot hz to dbs?

That's what I did. Here's an example plot (one that I made in June of 2007) for my previous subs.

 

[Adam]

Oh, and the "sub" labeled "Mach Two" is this one.

I was just checking out how well it would work.

 

[moreira85]

thanks i will try it out when the house is quiet!

 

[croseiv]

Oh, and the "sub" labeled "Mach Two" is this one.

I was just checking out how well it would work.

Lovely speakers there Adam! I used to have some very similar to those many moons ago.

 

[Adam]

Lovely speakers there Adam! I used to have some very similar to those many moons ago.

Thanks! Yeah, I hardly ever get rid of stuff.