Bad Bugs found, Please confirm

3 bug found that are serious in my books, I hope others can test these out to confirm if it:
1. Just my machine
2. All machine in a productions run
3. All machines
4. All machine, but it is Suppose to be that way,

If 4 above then Please explain you logic why it is suppose to be that way, and is not an actual bug.


MY firmware:
3.07.04


Please note that All of these tests Work as intended when the front speakers are set to SMALL,
All of the bugs appear when the fronts are set to LARGE.
Also note #1 below can only happen when using large speakers as the system does not allow small speakers with No sub

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1. Bass frequencies level increase inverse to X-over setting when set FRONTS to LARGE and Sub Set to NONE

Please also refer to post:
http://ubb.outlawaudio.com/ubb/ultimatebb.php?ubb=get_topic;f=34;t=000282


How to test
Get large front speakers capable of 30+hz


SPEAKER SIZE:
R/L: Large
Center: Large
Surr L/R: Large
Subwoofer: None

Now start up 2 channel CD and switch to STEREO MODE (actually, any mode except BYPASS will work)

Play music with good quantities low end bass 40-80HZ, Dance/trance/indust/other

Goto the:
SPEAKER X-OVER: menu setting
And change the
R/L xover settings. from 40 to 200 and back.
When the Xover setting is 200hz the bass is enhanced about 20% When set to 40Hz the bass is still boosted but at a lower level. As you progress from 40 -60-80-100-120 the bass level will be boosted more and more through the fronts speakers

This is a bug in the system, as the x-overs setting should not have any impact on the bass levels.

MY THEORY:
When a SUB is present and speakers are set to SMALL the Xover dictates what range of frequencies are routed to eh sub.

If the x-over is set to 200HZ then the spectrum from 0-200 are routed to the sub. when the xover is set to 40HZ Then Only the range 0-40HZ are set to the sub. Notice the 0-200 is much large then 0-40HZ


Thus When the sub is set to none, all the low frequencies that WOULD HAVE gone to the sub are sent Back to the front instead. (thats what the NO SUBWOOFER setting is suppose to do)
And the Higher the X-over settings the large the frequency range and thus the boost that should be going to the sub are re-routed back to the mains .


How it should work.
When fronts are set to large and sub to NONE, then should be No redirection of the Fronts Low end Back into the Mains. The X-over settings Should be disabled for the fronts When the Sub is set to NONE. Any other speaker set to small Should have its low frequencies (dictated by the x-over) routed to the mains.

Now im not sure HOW the bass is suppose to be redirected to other large speakers
AKA if the fronts are LARGE, and the center is small And the rears are LARGE, Will the Center low end (dictated by the x-over setting) be rerouted to Only the fronts? Or to all Large Speakers?
Same goes for the Rears, If the fronts are LARGE and center LARGE,and rears SMALL, Will the bass be redirected only to the fronts.. OR to ALL the large speakers (fronts + centers)


Easy fix, Change the code to Disable the x-over When fronts = LARGE and Sub=NONE.
IF the setup is suppose to redirect Any small speakers to ALL large speakers, Then change the code NOT to reinput It's own channel x-over settings (or disable the Xover for all Speaker set to LARGE)


NOTE: These settings should only disable the x-overs When the Sub=none. When the Sub = L/R + sub, Then the system should run as it is running now. and allow X-over settings to be set.
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2. When in stereo mode, The sub output is always Full range when fronts set to LARGE and Sub set to L/R +sub.

How to test.

Hook up the sub and disable and Built in Xovers.
Make fronts speakers LARGE

Play music.

You will notice that you are getting full range to the sub, No matter what the x-over settings are set for the front speakers.


How it should work.
IMO What should happen is that the fronts should receive Full range sound (as they are) and the Sub should only receive the frequencies lower then the x-over settings in the x-over menu.

AKA set the x-over to 60HZ and the sub outputs all frequencies 60HZ and lower to help reinforce the fronts Full range output (using the speaker natural cutoff slope for low frequencies)

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3. Bass not redirecting to sub when fronts set to LARGE and sub set to L/R + sub

Please read.
http://ubb.outlawaudio.com/ubb/ultimatebb.php?ubb=get_topic;f=34;t=000346

How to test.
Set fronts to LARGE Sub to L/R +SUB

Play a low frequency sounds Only through the fronts speakers, and see if you get any sub output.

the bug is that I get NO bass output.

I tested with DD 5.1 from the avia test discs

I use AVIA
Advance AVIA
Reference tones
WIDEBACND PINK NOISE , LEFT-FRONT Or Right Front


What Should happen.
From what i gather any low frequencies lower then the x-over setting for the front speakers should be redirected to the Sub, at the same time Full frequencies should be sent to the Fronts.

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3.5 Not really a bug, But a change that should be made.
change L/R + SUB to L/R +LFE


The L/R +SUB setting can be read to work a different way.
It can easily be confuse as :
Redirect all low frequencies (from the SMALL speakers) to the Sub ASWELL as the fronts L/R

Now here is and issue that might actually be happening, Perhaps this is they way it is suppose to happen....
So i pull out my RTA and plug the Front inputs into it, and turn front to LARGE and center to SMALL and sub to L/R +sub, Then I played Wideband Pink noise directly through the center channel only to see if the bass would be redirected to the L/R and the Sub. HMM the sub gets the redirection, but the Fronts Are Silent, and nothing on the RTA scope.

SO, the short of it is..

If the bass is suppose to be redirected from the front L/R to the sub (as well as Full frequencies to the Front L/R) then change the Sub setting to L/R + LFE

If the bass is suppose to be redirected from the SMALL speakers to the L/R front AND the Sub, Then keep the settings as L/R + Sub AND fix it so the system actually redirects the bass to the fronts L/R
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Ok that enough for now, I hope other can test their systems and post their Firmware versions.

If this affect all units I am surprise that they haven’t been found /posted yet, I guess everyone is just using the same setup at home with the same X-over settings.

I hope that these can be fixed ASAP, as it stands my 990 will be going back for refund, But I would rather these be fixed and I keep the unit. Oh well.. time to dust off my MC-1.


THANKS ALL FOR READING!!

I have a bad habit of writing longs posts, and boring people...