Rm6750

[Domino584]

Hey, new here.

I got some RM6750s and a V520K Pioneer Receiver for Christmas. Unwrapped the present and couldn't wait to hook them up. Everything was awesome.

A few months later I started to notice that although the lows and the highs were amazing, the mids were shallow, weak, and muddy. I've tried all these tweaks with my audio settings but nothing really worked out too well. Lowered the bass, still nothing, mids are just muddy. Eventually I resorted back to the defaults and noticed an improvement, but the quality is still rather poor for the mid-range.

I have the speakers upside down now because I've heard that it is a good idea to flip them if they are just sitting on the desk. I think I hear a difference, I dunno to be exact.

I have the audio get sent from my HD 5850 to the Receiver and then to the speakers. I've tried using the loudness equalization setting and it helped in games but music showed mixed results. Let alone, the rear speakers started to sound louder then the fronts. Up the dB of the centre, Left, and Right speakers and it didn't really help too much.

Any ideas on how I could get the mids to not sound like this? I've read reviews and most people said the mids/highs were very nice.

Cheers on any input or suggestions I could try. Could it be the cable? I'm thinking of using those banana clips. I apologize for my "newb speak". This is my start into quality speakers for gaming.

[Kenneth Swauger]

Hello,
One of the more important things about the RM6750 system is that the subwoofer needs to play up to 150Hz. This is because the satellites have a self-contained high pass filter limiting their lower response to 150Hz. What connection method did you use to provide a signal to the sub? The other consideration is that placing the satellites on a desk surface is going to change their frequency response. As a test is there a way you could place the speakers on speaker stands that would place them about ear level when seated? Or maybe place them on a shelf close to ear level? Or, maybe pull them close to the front edge of the desk, temporarily, to see if the overall response is better?
Regards, Ken

[Domino584]

Thanks for the response.


Hello,
One of the more important things about the RM6750 system is that the subwoofer needs to play up to 150Hz. This is because the satellites have a self-contained high pass filter limiting their lower response to 150Hz.

Hmm. I do have the cross over at 100 Hz on the receiver itself. I think that max I can go to is 200. I'll try getting the receiver to 150. I also have the sub itself saying 150 (I think, not too sure). But I don't think that would do anything as all the speakers and sub is connected to the receiver itself?


What connection method did you use to provide a signal to the sub?

I'm just using a single RCA cable to the receiver.


The other consideration is that placing the satellites on a desk surface is going to change their frequency response. As a test is there a way you could place the speakers on speaker stands that would place them about ear level when seated?

The desk I'm using does have them raised to ear level, but they are not on stands. I'm a little limited on desk space but I'll see what I can do. Should have time this weekend, and it doesn't hurt to invest in some stands. I'm probably going to be keeping these for awhile.


Or maybe place them on a shelf close to ear level? Or, maybe pull them close to the front edge of the desk, temporarily, to see if the overall response is better?
Regards, Ken

Do you think inverting them was a good idea? I was told that the tweeters are more narrow or "head strong" or something in their overall sound cone but the normal speakers tend to have a larger sound cone that would reflect on the surface.

I'll try the front of the desk too. It is a glass surface. I notice that my monitor for the PC makes the centre channel face downwards a bit just because of the limited space. Though I won't be able to play with them until this weekend. Lots of work this week.

Cheers for the info and help. Very helpful. :D

[Kenneth Swauger]

Hello D,
As an experiment try setting the receiver's sub-out crossover frequency to 200Hz and leave the variable low pass filer, on the sub, all the clockwise to the highest setting.
In a perfect world the satellites would be placed on rigid speaker stands that would position them fairly close to 36" off of the floor. Or, they can be hung on a wall working to have them about the same distance from the floor. Here again, as a test try placing them on a couple of folded towels or small blankets to try and absorb some of that reflected sound that being created by the desk top's surface.
I believe you are referring to the dispersion pattern created by the tweeter and mid range drivers. Because of the shape of the satellite's enclosure and the lack of any diffraction the dispersion pattern for that speaker is very wide. In this case, because of the desk top placement this is what might be contributing to the mid range problem you're hearing.
When you get a chance try the towel/blanket test and see how things change. Allow the material to spread out a bit in front of the speakers, working to absorb the sound that would otherwise be reflected.
Cheers, Ken