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More => Old Versions => JRiver Media Center 21 for Windows => Topic started by: AudioMunchies on April 13, 2016, 09:28:07 pm

Title: Why does JRiver not support Q above 1 for high-shelf and low-shelf filters?
Post by: AudioMunchies on April 13, 2016, 09:28:07 pm

Hello,
Topic says it all. Coming from miniDSP I've tweaked my crossovers using high-shelf and low shelf filters with Q>1 but in JRiver I'm getting this message.

(http://i.imgur.com/1JFRKsE.png?1)

any particular reason why and will this be changed anytime soon?

Title: Re: Why does JRiver not support Q above 1 for high-shelf and low-shelf filters?
Post by: RoderickGI on April 13, 2016, 11:48:17 pm

I believe that Hendrik answered that question not so long ago, but I can't find it quickly.

However, search is your friend. There are quite a few good discussions that touch on the topic.
http://yabb.jriver.com/interact/index.php?topic=86791.0
http://yabb.jriver.com/interact/index.php?topic=89047.0
http://yabb.jriver.com/interact/index.php?topic=98998.0

There are links in some of those threads to more information.

Title: Re: Why does JRiver not support Q above 1 for high-shelf and low-shelf filters?
Post by: mattkhan on April 14, 2016, 12:56:18 am

http://yabb.jriver.com/interact/index.php?topic=99096.msg686082#msg686082 sums it up

Note that jriver means S when it says Q

Title: Re: Why does JRiver not support Q above 1 for high-shelf and low-shelf filters?
Post by: AudioMunchies on April 14, 2016, 06:50:32 pm

Quote from: mattkhan on April 14, 2016, 12:56:18 am

http://yabb.jriver.com/interact/index.php?topic=99096.msg686082#msg686082 sums it up

Note that jriver means S when it says Q

Thank you very much. I used that equation and given a gain of 3dB we're left with approx 0.07<Q<0.707 then...

With miniDSP one can set Q>1.

I derived these values of Q using the formula in the post you linked.

S           Q
 0.01     0.070
 0.10     0.222
 0.20     0.314
 0.30     0.385
 0.40     0.445
 0.50     0.498
 0.60     0.546
 0.70     0.590
 0.80     0.632
 0.90     0.670
 1.00     0.707

Not very flexible imo. They should def. look into this.

Title: Re: Why does JRiver not support Q above 1 for high-shelf and low-shelf filters?
Post by: AudioMunchies on April 15, 2016, 10:27:19 am

Been reading about this issue, and it seems like it has been present for some time. Stacking filters, measuring the output to approximate the target filter etc is not exactly user friendly and this should be looked at asap imo. It can't possibly be that complex to fix, it probably comes down to a few lines of code.