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New Polk Audio m40s Sound Issue

post #1 of 18
Thread Starter 
I recently purchased a Dayton Audio DTA-100a matched with the m40s. I set everything up, plugged the my ipod into the amp, turned up the volume......and to my surprise the bass seemed very overpowering. It sounded almost like there was a heavy blanket over the music.When I turned down the volume to about a quarter left the music shined, it sounded beautiful. I've tried listening to 320kbps mp3s first, then I ripped some flacs of pink floyd with the same mud like results. Just for the hell of it I bi-wired them to see if that would make a difference....If there was one I didn't hear it.I'm not an audiophile in anyway.That being said my ears are very acute to sound(I have really big ears). The slightest out of place noises bother me. My t.v. makes a very low hiss that is in audible to most people, but it drives me insane... I can hear my halogen desk lamp hiss.I'm hoping one of you can point me in the right direction. What do you think I'm doing wrong? Could I possibly have a defective amp? Both speakers can't be bad, I'm really hoping this is user error related.

Edit: Sorry for the huge paragraph. I tried to Indent but failed.
Edited by Together - 10/24/11 at 8:26pm
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post #2 of 18
So it sounds fine at lower volume, but the treble basically goes away at higher volume?

Sounds like the amp is faulty to me, as a first guess. Could be settings on the iPod, or it could also be that you're pushing the volume too hard on that amp.
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post #3 of 18
Thread Starter 
I've only turned the volume knob a little more than half way. Turning it all the way to the right is full power right? I messed with the equalizer in the ipod and switched it between flat and less bass, less bass sounded the best but vocals still sounded muffled. What would you check that I haven't all ready? The sound sounds smoothest when the knob is turned down to around 50% on the amp.

Edit: Yes! The treble goes away and the bass increases at higher volume, when the vol. knob id turned a little more than half way.
Edited by Together - 10/24/11 at 8:40pm
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post #4 of 18
Quote:
Originally Posted by Together View Post
I've only turned the volume knob a little more than half way. Turning it all the way to the right is full power right? I messed with the equalizer in the ipod and switched it between flat and less bass, less bass sounded the best but vocals still sounded muffled. What would you check that I haven't all ready? The sound sounds smoothest when the knob is turned down to around 50% on the amp.
My DTA-100a puts out maximum power at about 60% volume knob. Anything more than that, and it distorts and sounds bad.

Full power happens when you reach 50w RMS coming out. Depending on the source, that could be anywhere from 50% volume to full volume.

I'm wondering if those Polk M40's just need that much more power to run properly. According to Newegg, they'll take 125w RMS. Being that its a dual woofer bookshelf, its fully possible that its just not enough power to power them 100% (especially since your amp is 50w RMS, the speakers want 125w RMS).

It should still POWER them fine though, and get plenty loud with 50w RMS. You just wouldn't get the full excursion out of the speakers that they're capable of.
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post #5 of 18
Try having the volume on your Ipod as low as possible. also have you consider using a LOD? not sure what you are using though
post #6 of 18
Thread Starter 
Dank not sure what you mean by turning the volume down on the ipod, if I do that nothing comes out of my speakers. I'm just using the amp, speakers and ipod. What is a LOD?
Edited by Together - 10/24/11 at 9:08pm
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post #7 of 18
Quote:
Originally Posted by Together View Post
Dank not sure what you mean by turning the volume down on the ipod, if I do that nothing comes out of my speakers. I'm just using the amp, speakers and ipod. What is a LOD?
well when I plug in my Mp3 player with the volume upwards of 50% to my receiver the sound produced is awful specially with poorly encoded mp3 tracks. I usually just leave all my source volumes at 25% and use my receiver to control the volume.

have you used anything besides the iPod? what about the Xonar?

LOD is a Line Out Dock Cable that bypasses the amp in the player, just wondering if you had one if you dont nvmd.

you should try multiple sources of audio so you can try and isolate the problem
Edited by Danker16 - 10/24/11 at 9:10pm
post #8 of 18
Thread Starter 
Pioneer you were correct in thinking I wasn't running enough power to them. I contacted polk audio explained my setup to them and the problem I was having. The guy immediately told me I was seriously under powering the speakers, and at higher volumes they simply cant output clean clear sound because there wasn't enough power.

-Thanks for the help y'all
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post #9 of 18
from 3 feet away, with an input of 10w, and ignoring any possible gain from walls or other boundaries, a single m40 should be putting out 100dB. the monitor40s aren't power hungry at all.
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post #10 of 18
Thread Starter 
They only seem to be power hungry when I want the music to be pretty loud. I've googled around and it seems under powering speakers creates the muddy listening effect(exactly what I was experiencing). Like pioneer said, the polk m40s can handle up to 125w RMS and I'm pushing less than half that when I crank up the volume.
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