Audio Gurus, Need Some Serious Help!!

[satish536]

This is my second post here...
I have a home theatre and for some reason my front speakers distort at high volumes basically the bass .I dont even know if its exactly distortion some kind of very harsh noise noise(I think similar to the noise that comes when u get some kind of an electric current to a speker) I'm not being to explain this rite ... . I want to find out where the problem lies ? ,Well my receiver is a onkyo tx-ds676 which pumps out about 85 watts rms to each channel ...I have Infinity rs - 4 on the front left and right ,Infinity cc-3 Center Channel, Bose Model 100 Surrounds, Inifnity Bu-75 SubWoofer .My problem is my Front speakers tend to distort when there is heavy bass in the movies (like hip hop beats n heavy beats,shocking scenes where the Bass is high), My speakers can handle 150 watts rms ....so why the hell are they distorting ......my receiver has bass setting from -12 to +12 ....i have it set on +2.Though this happens only in like 2 percent of the whole movie when there is a really shocking scene between two characters ,when someone falls to the ground hard etc. with a lot of bass kind of sound i guess .....but still is very irritatin !
Specs:-
Onkyo TX-DS676
Continous Power Ouput5 x 115 W at 6 ohms
Continous Power Ouput5 x 145 W at 4 ohms
85 W per channel min at RMS at 8 ohms

My Front Speakers :-
Infinity RS-4
Frequency Response: 40Hz - 32kHz (+/-3dB)
Recommended Power Amplifier Range: 40 - 150 watts per channel RMS
Crossover Frequency(ies): 600Hz, 4kHz
Nominal Impedance: 4 - 8 ohms
Woofer: 8" polypropylene
Midrange Driver: Polydome
Tweeter: EMIT

My room is 16 X 18 Feet
1. Well people adviced me to go with a power amp to drive the 4ohm speakers, Is that a good solution out of this ?

2. I also want to tell y'all that my speakers were not in use for a conitnous perios of maybe around 2 and a half yrs <jus lyein in my basement till my HT room was being constructed...) ......could that be creating the problem ? Can i fix it somehow , if that is creating the problem?

 

[MDS]

The 'nominal' impedance can't be a range like 4 - 8 Ohms; it will be a single number. That spec probably means the minimum impedance is 4 Ohms and the nominal impedance is 8 Ohms. It's possible that the speaker is 4 Ohms much of the time and yes, that is difficult for a receiver to drive.

An external amp will help if that is the case, but I suspect the real issue is simply the low end frequency response of the speakers. Rap, Hip-Hop and other bass heavy music and movies will have very low bass and the speakers just can't deal with that at high volumes. A subwoofer would be a valuable addition to your setup.

 

[snickelfritz]

Set the receiver tone controls to "0" for now.

Set all of the speakers in your system to "small" with 80hz crossover in the receiver setup program.
(this prevents high level bass from overloading your speakers and increases amplifier headroom)

In the receiver setup program, set the subwoofer level to -5db.
(this prevents high level bass from clipping the preamp)

Set the subwoofer volume control (the one located on the back of the subwoofer) so that the bass is balanced with the rest of the speakers.

Move the subwoofer to the corner of the room to increase the perceived bass output.

 

[satish536]

Distortin Infinities

Hey thanx MDS
My speakers are already set to small, My reciever doesnt give me a crossover setting its pretty old , and i do have a sub and it still does distort , Im so confused need to get the source of the problem before we can tackle it for a solution rite !!!!

Hey guys keep me informed people your feedback is all have cos i live in ndia in Asia where i cant get any support reagardin this as here HTIB are still the latest new thing lol !!!

 

[j_garcia]

If those are your settings, then your receiver doesn't have enough power to drive your speakers at the volume you are asking of them in your room. You can find out by playing the same scenes that causes the problem in STEREO. If it still does it with only two speakers playing, then you either don't have enough power or you may have damaged speakers. If your receiver doesn't give you a choice of x-over, it is probably fixed at 80Hz or 100Hz.

Are we talking DVDs, VCR, TV, etc... here? How is your DVD player connected and is it setup correctly?

 

[satish536]

dvd player

My dvd player is a Harmon/Kardon DVD 22 , It is connected via an optical digita cable and is set up poperly im guessing, The first thing im gonna do is try is setting it to stereo mode and trying it out lets see what happens !!!