[Jonomega]

Hello, I have just received the new R-DES and it seems quite easy to use. 

Unfortunately, the changes made in R-DES don't seem to translate exactly to changes made in the FR as measured by REQW.  For instance, I had a 6db peak from 60-70hz and when I applied two filters at -10db with bandwidth 9 @ 66hz, there was absolutely no change in the graph.  The crossover is 75hz.

My Maestro XL is set to Bypass, 180 degrees, gain at 9 o'clock.  When the subwoofer is turned off, there is a deep hole between 60 and 70hz.  When the sub is 0 degrees phase, a huge hole from 30hz-70hz occurs.  I define hole as worse than -12db.

Also, when I boost 20hz by 1db, the FR ends up losing 20hz all together (-10db).  When I play around with the bandwidth, varying effects occur including, but not limited to total drop of that frequency at varied values of Q.  Also, decreasing 30hz peaks caused 60hz to fall. 

Not sure what is going on here.  The tool is very straight forward - even a 8 year old would have absolutely no problem with it. 


Equipment:
B&W 804s floorstanding speakers
Rotel RC-1070
RB-1070
RCD-1072
ACI Maestro XL
R-DES version 2.
(LxWxh) 17.25'x12'x9'

[Mike Dzurko]

Really strange . . . something seems wrong but I can't imagine what it is at this point . . .  I'll keep scratching my head here. Probably something real basic that we're both missing.

[Jonomega]

either that, or some extremely complex acoustical explaination? 

I was hoping this would be as easy as:
1. Sweep FR
2. Take note of problems
3. Lower peaks
4. Sit back and enjoy the music.

But its not... :/

[Mike Dzurko]

either that, or some extremely complex acoustical explaination? 

I was hoping this would be as easy as:
1. Sweep FR
2. Take note of problems
3. Lower peaks
4. Sit back and enjoy the music.

But its not... :/

That's why I'm scratching my head. It SHOULD be just about that easy.

[Jonomega]

I have a 30hz, +6db, Q=9 working.  Ill try a 20hz one in addition to the 30hz one tomorrow.  Perhaps, yesterday, I was updating the R-DES too many times or it overheated or something.  Ill update with success/failures. 

Unfortunately, I have to turn off my room AC in order to get any meaningful measurements done.  It being 102F outside, I cant really afford to do that today


Edit:  So, now, after reloading the software, I have a [20hz, +6db, Q=5], [30hz, +4db, Q=9], [60hz, +2db, Q=9], [xover @ 75, +1db] filter system setup, the FR is smoother, but now I get wierd Bass pulses around 26-40hz (to my ears) randomly while signal is passing whether or not its a game or music.  I could be playing a game like CounterStrike: Source, or listening to CDs or mp3s and this wierd pulse will occur.  I've isolated 10 seconds of a quiet song that it does this at least 3 times, and it doesnt do it when on an bypass, off, or on another setting 2,3,or 4 (which have all filters at 0db).

Perhaps the RDES doesnt like applying gains to so many frequencies (these are non-modal troughs in the response).  Tomorrow, I will try to obtain the same FR by increasing the subwoofer amp's gain, such that I will only have to apply negative gains to troubling frequencies.

Any idea on how to know for certain whether or not I got a lemon?

[BradJudy]

Is this an older v1.0 R-DES?  There were some problems with the first round of devices and they have released a v1.1 that addresses those issues.

[Mike Dzurko]

Brad:

No, he has a brand new one. One thing, in general the most effective EQ is to cut the peaks rather than trying to boost the nulls.

[Jonomega]

So far, anytime I have a boost of any kind, I will get wierd low bass pulses during game/music play.  Whenever there is a low bass note (around 30-40hz) there is an overcompensation and I get a delayed wha-ahmp tone from the sub.

This is with 4 filters off, 1 filter set to 30hz, Q=15, +4db.  Crossover is 75hz and 4th order.

The wierd low bass pulses dissapear when I remove the 30hz boost. 

This flaw is very troublesome to me.


Edit: I have proceeded to increase the gain the sub amp so that I would only apply cuts on all of the filters.
20hz, -6db, Q=9; 35hz, -2db, Q=9; 50hz, -2db, Q=3; 80hz, -3db, Q=3; 75hz 4th order crossover.
I still get the wierd bass pulses.  This occurs when the bass line is repeated on the same note.  Ugg... Any suggestions?

[Mike Dzurko]

Just got back into town . . . any luck on getting this resolved?

[Jonomega]

Just got back into town . . . any luck on getting this resolved?

No, Sean over at av123 has already taken a look at my R-DES xml file and nothing is wrong with the software.  I am unsure what the next step is.

[Mike Dzurko]

I'll start doing some digging . . . this is a new one. I admit that I really never use any boost, just cut so I wouldn't have noticed. However, there are a bunch of other beta testers and I know some of them tried boost. We'll get it figured out one way or another!

[Jonomega]

I'll start doing some digging . . . this is a new one. I admit that I really never use any boost, just cut so I wouldn't have noticed. However, there are a bunch of other beta testers and I know some of them tried boost. We'll get it figured out one way or another!

I got the problem with cuts and boosts of any magnitude, any bandwidth, and any frequency.  I did about 24 different configurations with cuts, boosts, mixed, etc.

[Jonomega]

Thread closed.

I am working with Mr. Parque.  Seems to have disappeared on its own after several 100 hrs of playback and power cycling of equipment. 

[Mike Dzurko]

Thread closed.

I am working with Mr. Parque.  Seems to have disappeared on its own after several 100 hrs of playback and power cycling of equipment. 

Glad it's working now . . . IF you ever have any further problems, let us know and we will get it taken care of . . . enjoy!