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home audio help. (1 Viewer)

younggun

Auditioning
Joined
May 7, 2008
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Real Name
marshall
hey guys, first post here.
i am having a small, but very irritating problem with my home sound system.

first of all, the setup is a Denon usrround reviever AVR-1505, paradigm Monitor 7v.4 towers, with rear cinema 70 v.2 speakers(paradigm) and a paradigm cc-170 v.3 center mounted speaker.
along with that i have a Paradigm PDR-10 v.3 sub. thats whats giving me problems.
some movies, and espcially with music it sounds like its bottoming out very bad. it sounds like crap!

i cant get the reciever over -25 without it making the noise. i have the sub settings on the rear turned down low, and even the DB levels on the reciever turned low.
i like to listen to my music loud, and i tend to listen to tunes with a fair bit of bass.
any input?

Thanks in Advance!
Marshall
 

Robert_J

Senior HTF Member
Joined
Aug 22, 2000
Messages
8,350
Location
Mississippi
Real Name
Robert
First calibrate everythign with a Radio Shack SPL meter. It's the best $40 investment that a home theater enthusiast can make. A calibration DVD with the SPL meter is even better since receiver test tones have been known to be off.

If that doesn't solve your problem, you need to plot the frequency response of your sub. Again, using the SPL meter and a CD of test tones. The software to generate the tones is free. All you have to do is burn them onto a CD. Based on the results, you may need to move your sub around to another location so that there are less peaks or nulls in your listening position. Sometimes an EQ is required to flatten the response. Details on all of this will require multiple postings so lets wait until we get to this point.

Finally, you may not have enough sub to meat your bass goals. You are just pushing it past the limits every time you listen. Sooner or later, it will give up if you keep bottoming it out. Do you hear a metal to metal CLACK? Or is it just heavy distortion? Distortion could be anything from amp distortion to pushing the driver past its linear limits but not mechanical limits. Bottoming out is pushing the driver until the voice coil smacks into the back plate of the magnet. If this is the case, an additional sub of the same model or replace it with a more capable sub.

-Robert
 

younggun

Auditioning
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May 7, 2008
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4
Real Name
marshall
definately bottoming out.
sounds like its hitting something.
i guess i wil get a meter and see if i can get it set up right then how everything sounds.

Thanks a tonne!
Marshall
 

younggun

Auditioning
Joined
May 7, 2008
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Real Name
marshall
so i went out and bought a scosche SPL1000
i hope it was the right one.
i put on a couple bass testers and looked at the chart and set the sub to the DB level it says, and then turned it up to where it bottomed out, then back down, and i have it set fairl good.
doesnt bottom out anymore on hard bass hits, or constant low freq.

i also re-positioned my sub so the sound come out toward the viewer, it was mounted going sideways before. if that makes sense.

one problem that irriates me is when the volume is turned down for watching movies, the bass isnt very noticable anymore because i have it set for a higher volume level.
 

Robert_J

Senior HTF Member
Joined
Aug 22, 2000
Messages
8,350
Location
Mississippi
Real Name
Robert
A sub should not be noticed. It should blend in seamlessly with the rest of the speakers. I run a pair of 15" subs powered by a 2,400w professional amp and they are barely working during 99% of my listening.

-Robert
 

younggun

Auditioning
Joined
May 7, 2008
Messages
4
Real Name
marshall
i couldnt find the radioshack SPL meter.
all of our radioshck's are now curcuit city, and they didnt have what i was looking for.

i guess i have to get a proper SPL meter and do it correcty. is it worth paying someone to calibrate your system? this is my first experince with anything like this...

i did reposition my sub within the room. not just turn it.

thanks alot for the help so far!
 

Robert_J

Senior HTF Member
Joined
Aug 22, 2000
Messages
8,350
Location
Mississippi
Real Name
Robert
$44 from SVS. I'll bet Fleabay has a ton as well.

Is it worth it to pay someone hundreds of dollars to come and calibrate your system? I don't know how you throw your money around but I'm pretty thrifty. It did take some time to learn how to calibrate so is your time worth that much? I use occaisions like that as a learning experience. In the future, it will save you money. You will buy new equipment and have to re-calibrate. If you don't know how to do it, then you have to pay someone again.

It doesn't apply directly here but here is how DIY saves you money. I learned how to install satellite dishes back on my first system. Since then, I have installed at least a dozen dishes for friends, family and the different places I have lived. On my last upgrade, DirecTV required a "professional" install of the dish. Fine. It was free. Well, I got what I paid for. Within a few months, wind had blown the dish out of alignment. I called D* and asked for a re-alignment. $97 for the service call is how they responded. I argued, pleaded and begged. They didn't budge. The next morning, I pulled out my ladder and adjusted the dish myself. It took less than 10 minutes and saved me almost $100.

-Robert
 

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