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AVS › AVS Forum › Audio › Subwoofers, Bass, and Transducers › Setting cross over for 2 PSW505 with POlk RM8s speakers
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Setting cross over for 2 PSW505 with POlk RM8s speakers

post #1 of 9
Thread Starter 
Ok,this thread is for anyone who is bored and has a little kindness left in their heart to help out a fellow member smile.gif.My current surround system consists of a Yamaha RX-V671 receiver connected to Polk Audio RM8s speakers and 2 PSW505 subs.These are my current settings

Speakers set to SMALL
Bass cross over set to 100Hz
Sub level through the reciever set to 0dB

As Im no expert,is the bass crossover set too high?Any changes would you recommend?

Ive tried playing with the settings and cant really come up with a desireable sound.Any help is much appreciated,thanks in advance!
post #2 of 9
We can't help you without some answers to a few basic questions:

How big is your room? What are the dimensions? Is it rectangular or does it have multiple width/length/height dimensions?

Where are the subs placed in the room?

How far do you sit from the speakers and subs?

Your speakers are "spec'd: with a -3 dB point of 130 Hz. However, that's an "anechoic" measurement, and they could be above or below that in your room, depending on size of the room, the placement. and your listening position.

What did YPAO set the subwoofer crossovers to? Did you change it it?

Do you have any measurement capability... i.e., REW, Omnimic, XTZ, RA, etc.?

Craig
post #3 of 9
Thread Starter 
Hi Craig,I knew i would be answering a few questions,but wasnt sure what they would consist of,well,my room is rectangular shape and dimensions are 13x17with 9ft ceilings.The YPAO set the sub at -10 dB and yes I changed it,just playing with the settings.Sitting position is approx 13ft from the front wall where the TV is mounted above the fireplace.I havent changed any speaker dB so Im assuming the -3dB is consistant.The subs are positioned at the LF and RF of the room.SPeakers are wall mounted Approx 3ft down from the ceiling in all 4 corners.I know its not the best height requirement but I was limited to excess wires from the wall.Unfortunately i dont have any measuring capabilities.I know I will never get the sound to be at 100% theatre like,but for basic movie watching id like to obtain somewhat the best sound with what I have to work with.Thanks for your response,hope Ive answered your questions.
post #4 of 9
Quote:
Originally Posted by jroptop View Post

Hi Craig,I knew i would be answering a few questions,but wasnt sure what they would consist of,well,my room is rectangular shape and dimensions are 13x17with 9ft ceilings.[/quoyte]
Less than 2,00 cubic feet... that's not too big for your system, unless it's an open room with other adjacent spaces.

The YPAO set the sub at -10 dB and yes I changed it,just playing with the settings.
I was asking about the crossover YPAO set, not the levels. This would be the speaker crossover frequencies. Did it set the crossover to 100 Hz, or did you change it after running YPAO. If you changed it, what was it set at *before* you changed it? Also, why did you raise the subwoofer level from -10 to 0? Do you realize the subs are now twice as loud as the speakers?
Quote:
Sitting position is approx 13ft from the front wall where the TV is mounted above the fireplace.I havent changed any speaker dB so Im assuming the -3dB is consistant.
The -3 dB point is the frequency that the bass starts to roll-off. Your speakers are rated tp 130 Hz, so if you cross them over at 100 Hz, you'll have a "hole" in the output from 100 Hz to 130 Hz, at the minimum. However, your speakers have two 2.5" midrange drivers. It's not likely they'll even do 130 Hz with any authority. I suggest you raise the crossovers to 150 Hz. I would not go any higher than that because your subs aren't capable of much higher frequency response than that anyway.
Quote:
The subs are positioned at the LF and RF of the room.
With the subs in these positions, sub localization should be minimized.
Quote:
SPeakers are wall mounted Approx 3ft down from the ceiling in all 4 corners. I know its not the best height requirement but I was limited to excess wires from the wall.
Corner placement is not optimal for speakers. They get too many early reflections off the walls, which muddies up the sound. If you can, move them away from the corners. Also, be sure you have the "side" driver mounted so it's not pointing at the wall.
Quote:
Unfortunately i dont have any measuring capabilities.I know I will never get the sound to be at 100% theatre like,but for basic movie watching id like to obtain somewhat the best sound with what I have to work with.Thanks for your response,hope Ive answered your questions.
With optimal setup, even these smaller systems can sound pretty decent. You can't expect full output Reference Level, but they should sound pretty good with the context of their limitations.

Craig
post #5 of 9
Thread Starter 
Ok,now Im understanding,well,with the results of the YPAO setup,it set the crossover at 160 Hz,I redid the setup and here are the results
SIZE-SMALL
LEVELS-sub -10.0 dB
CENTER +2.0dB
LF +7.5dB RF +7.0dB LR +7.5dB and RR +6.5dB

I havent done any other changes and left it as such
post #6 of 9
How does it sound?
post #7 of 9
Thread Starter 
In all actuality,Id like to hear more sub,but not sure what settings to change to get more UMPH! The volume on the subs are mid way,the bass cross over is set at 160HZ and the sub level is set at -10dB.Any suggestions would be appreciated.Thanks to all thus far!!
post #8 of 9
Quote:
Originally Posted by jroptop View Post

In all actuality,Id like to hear more sub,but not sure what settings to change to get more UMPH! The volume on the subs are mid way,the bass cross over is set at 160HZ and the sub level is set at -10dB.Any suggestions would be appreciated.Thanks to all thus far!!
Well, if you "like" the sub run hot, that's your decision. Just realize it's not properly calibrated. Also, remember that every 3 dB you turn it up, you use twice the amplifier power and twice the driver excursion. At some point you run out of headroom and the subs start to compress and distort. Just don't run them so hot that they "bottom" as that is potentially very harmful to the drivers. If you want to turn the sub up, I suggest you do it with the trim setting in the receiver. That's the easiest way to ensure you can go back to the calibrated level should you want to.

Craig
post #9 of 9
Thread Starter 
Hey Craig,thank you soo much for the added precautions,actually with the bass cross over set at 160Hz and the volume on each sub set at half way,I only increased the sub level from -10dB to -8dB,Im extremely pleased thus far as to how the surround sounds with TV viewing and Blu Ray.Just out of curiosity,would a notice a difference in bass cross over at 120HZ? I remembered you mentioned setting it at 150HZ but in my setup menu I have 40HZ 60HZ 80HZ 90HZ 100HZ 110HZ 120HZ 160HZ and 200HZ.
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