Official OPPO BDP-105 Owner's Thread - Page 412 - AVS | Home Theater Discussions And Reviews
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post #12331 of 12341 Old Yesterday, 04:23 PM
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Originally Posted by misko72 View Post
I dont think there is any clipping.
Its just the way it sounds.

I think it has something to do with low pass filter and its rolloff,bryston has 24db octave filter,where oppo must have something like 12db,which would be very unusual for low freq.
Probably it has 18db and that is the culprit!
From my experience,difference between 18db and 24db can be huge.

It can take up to 4vrms in bypass mode.
Never heard of an 18dB slope. The OPPO is 12dB.
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post #12332 of 12341 Old Yesterday, 06:05 PM
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Originally Posted by Mongo171 View Post
Never heard of an 18dB slope. The OPPO is 12dB.
I had some old "Infinite Slope" brand speakers years ago that had 100+dB-per-octave crossovers. Loved the sound of the speakers - but really can't say whether the crossover slope did anything for them. I suspect that it did, since the phase distortion problem that is inherent in crossovers was mitigated to a great degree. But now we have DSPs that can compensate for that to some degree, and there are both advantages and disadvantages to both conventional and "hard-wall" crossovers. The Audio Theory forum ought to have a good discussion about this.

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post #12333 of 12341 Old Yesterday, 10:44 PM
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Originally Posted by Mongo171 View Post
Never heard of an 18dB slope. The OPPO is 12dB.
I couldnt find what slope is on oppo,but when its true that it has 12db,i am sure this is the problem i am experiencing.
Why would they use 12db slope,is beyond me.In low pass slope should be steeper,am i right?
In car audio nobody ever would use
12db for low fq.I had amps and preamps in my car,where i was able to set low pass slope,always ended up with 24db and the difference was exactly i am experiencing right now,with oppo player.

Maybe it can be 'fixed' in future with software update?Probably more people must demand it,which i really doubt.

Mike
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post #12334 of 12341 Old Today, 07:08 AM
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Quote:
Originally Posted by misko72 View Post
I couldnt find what slope is on oppo,but when its true that it has 12db,i am sure this is the problem i am experiencing.
Why would they use 12db slope,is beyond me.In low pass slope should be steeper,am i right?
In car audio nobody ever would use
12db for low fq.I had amps and preamps in my car,where i was able to set low pass slope,always ended up with 24db and the difference was exactly i am experiencing right now,with oppo player.

Maybe it can be 'fixed' in future with software update?Probably more people must demand it,which i really doubt.

Mike
My sub has the option of a 12dB or 24dB slope. I use 12dB, but not in a normal way. Sounds good in MY room. You just have to play with it to see what sounds good in YOUR room.

"I am a Meat Popsicle." - Corbin Dallas, "The Fifth Element"
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post #12335 of 12341 Old Today, 07:16 AM
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Originally Posted by Mongo171 View Post
My sub has the option of a 12dB or 24dB slope. I use 12dB, but not in a normal way. Sounds good in MY room. You just have to play with it to see what sounds good in YOUR room.
I can not play with it,because oppo is not giving me any option
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post #12336 of 12341 Old Today, 08:41 AM
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Quote:
Originally Posted by misko72 View Post
I couldnt find what slope is on oppo,but when its true that it has 12db,i am sure this is the problem i am experiencing.
Why would they use 12db slope,is beyond me.In low pass slope should be steeper,am i right?
In car audio nobody ever would use
12db for low fq.I had amps and preamps in my car,where i was able to set low pass slope,always ended up with 24db and the difference was exactly i am experiencing right now,with oppo player.

Maybe it can be 'fixed' in future with software update?Probably more people must demand it,which i really doubt.

Mike
You are talking about the slope of the Crossover, right? 12dB per octave is perfectly normal. You definitely do *NOT* want a brick wall filter -- i.e., a much higher slope -- as that leads to artifacts.

If you find you prefer a higher slope (as set in your other gear), that suggests either your main speakers are not really good down that low -- i.e., you should really be using a higher value for your Crossover frequency -- or you have room response problems with the bass output of your main speakers when they are allowed to output bass that low -- i.e., the physical location of the Sub is better for coupling those bass frequencies to the room than the physical location of the main speakers.

The only place where high slope filters are appropriate is for very low frequency bass protection. I.e., keeping your Sub from trying to reproduce bass, say, *BELOW* 16Hz. There 24dB/octave is not uncommon.

Are you still trying to use a 50Hz Crossover setting in the OPPO? I really don't recommend that.
--Bob

Anthem D2/D2v/AVM50/AVM50v/ARC1 tweaking guide. -- Need personal consultation/training? PM me!

Last edited by Bob Pariseau; Today at 08:46 AM.
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post #12337 of 12341 Old Today, 09:13 AM
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Originally Posted by Bob Pariseau View Post
You are talking about the slope of the Crossover, right? 12dB per octave is perfectly normal. You definitely do *NOT* want a brick wall filter -- i.e., a much higher slope -- as that leads to artifacts.

If you find you prefer a higher slope (as set in your other gear), that suggests either your main speakers are not really good down that low -- i.e., you should really be using a higher value for your Crossover frequency -- or you have room response problems with the bass output of your main speakers when they are allowed to output bass that low -- i.e., the physical location of the Sub is better for coupling those bass frequencies to the room than the physical location of the main speakers.

The only place where high slope filters are appropriate is for very low frequency bass protection. I.e., keeping your Sub from trying to reproduce bass, say, *BELOW* 16Hz. There 24dB/octave is not uncommon.

Are you still trying to use a 50Hz Crossover setting in the OPPO? I really don't recommend that.
--Bob
Bob,i really appreciate your input..

No,iam not using 50hz anymore,altough it was as close as could get to prepro.


I wouldnt call 24db slope 'brick wall filter'its not like 48 or higher,..
With 24db slope,there is still some leakage of higher fq,so it should provide smooth blend with main speakers.


Is it very hard to include that option in software update,or is it hardware related?
Thanks

Mike
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post #12338 of 12341 Old Today, 09:40 AM
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Originally Posted by misko72 View Post
Bob,i really appreciate your input..

No,iam not using 50hz anymore,altough it was as close as could get to prepro.


I wouldnt call 24db slope 'brick wall filter'its not like 48 or higher,..
With 24db slope,there is still some leakage of higher fq,so it should provide smooth blend with main speakers.


Is it very hard to include that option in software update,or is it hardware related?
Thanks

Mike
I'm' not privy to the implementation details, but it is likely it's adjustable, as it is done in the digital audio processing.

You can email OPPO Tech Support with your suggestion. They do take such stuff seriously.
--Bob

Anthem D2/D2v/AVM50/AVM50v/ARC1 tweaking guide. -- Need personal consultation/training? PM me!
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post #12339 of 12341 Old Today, 09:57 AM
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Originally Posted by Bob Pariseau View Post
I'm' not privy to the implementation details, but it is likely it's adjustable, as it is done in the digital audio processing.

You can email OPPO Tech Support with your suggestion. They do take such stuff seriously.
--Bob
That would be great,if they included such feature..
But i am afraid,i am alone with such
an idea.

I will definitely contact them...

Your help is really appreciated,Bob..

Mike
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post #12340 of 12341 Old Today, 10:01 AM
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Originally Posted by misko72 View Post
That would be great,if they included such feature..
But i am afraid,i am alone with such
an idea.

I will definitely contact them...
They've been known to implement ideas that the think have merit rather than relying on hundreds of people to make the same request.
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post #12341 of 12341 Old Today, 10:54 AM
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Ok guys...
Here is the reply from tech support
:

Michael,

The DSP in the player was to be used at a single crossover point and at an optimal 12dB octave/slope. The ability to increase this to 24dB, as well as allow for multiple crossovers to compensate for different speaker sizes, is something that has been requested but not something that the player currently supports. This is likely not something that we can add through firmware.

Best Regards,

Customer Service
OPPO Digital, Inc.
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