TOPIC:

What is the lowest frequency allowed on the parametric and other EQs? I didn't see it in the spec sheet. I'd like to EQ a sub w/ a peak in the 13hz range.

Thanks,
John

John,

Currently, PEQ controls only go down to 20Hz. Doesn't mean that frequency response of the board only extends to 20hz, just the PEQ does...

Maybe in future upgrades of the plug-in we'll modify it... In the mean time, if your only request is to add a Peak at 13Hz, you can easily do that with any of the Advanced plug-ins allowing you programming down to the biquad level. Have a look at the app note here for more info: www.minidsp.com/applications/advanced-biquad-programming

Hello,

I'm also looking for low frequency EQ and filtering of frequencies below 20Hz, if your product supported this it would stand out as most products only support down to 20Hz. There is much content below 20Hz found in many Blu-Ray and DVD movies.

My specific interest is SSF (subsonic filtering) with a corner frequency below 20Hz. This would be a high pass filter with the ability to specify a corner frequency into the low single digits, lets choose 2Hz for being a decade below 20Hz. Ideally this lower frequency limit would be added to your 2-way and 4-way advanced crossovers with all other features remaining in place.

I understand there may be limitations that prevent the product from working down to 2Hz (analog input or output limitations or other) but at least supporting the software/DSP side allows the user to set and test the effect.

Some useful applications where a lower than 20Hz high pass filter could be used to protect equipment (preventing subwoofer driver over-excursion) and saving amplifier headroom:
A) Infinite baffle subwoofers often have response well below 20Hz
Many custom and/or expensive subwoofers go well below 20Hz
C) The Danley Sound Labs DTS-10 has a low corner frequency of 11Hz and solid output to this point
D) Thigpen rotary woofer (Eminent Technology TRW-17), 1-30Hz range (yes one hertz), often its crossed out at 20Hz to a conventional subwoofer working above 20Hz

Please consider and respond. I would expect more recognition and sales to the extreme low frequency enthusiasts with this <20Hz support which would also drive more miniDSP visibility by the DIY audio community and other target customers.

Regards,
HDaudio

P.S. See attached frequency spectrograph, I think this is an excerpt from the movie "The Hulk," the pink color represents near 0dBFS output which is occurring in some cases well below 20Hz. A good SSF is needed in this case at high SPL to protect audio equipment and/or one's house.

Hello,

Adding support for subsonic frequency control is indeed possible... We'll consider it in future versions of the software. In the mean time, you indeed can do so by using the Advanced plug-in. Just plug-in your biquad values and it will work.

Future versions of plug-in will come out pretty soon.

I would definitely like to see subsonic filtering and the ablity to EQ below 20hz.
Also would prefer to be able to adjust delay beyond 7.5 ms.

<strong>testwork wrote:</strong>

I would definitely like to see subsonic filtering and the ablity to EQ below 20hz.
Also would prefer to be able to adjust delay beyond 7.5 ms.

+1

Subsonic filtering for our Danley DTS-10 sub and longer delay to time align our Klipshchorns.

Thanks for a cool product and for listening to your customers.

Happy New Year.

Rod

Subsonic filtering is already in the work and working in our local Beta site at the office.
Delay beyond 7.5ms is simply not going to happen since we don't have DSP power left to implement it in the current configuration where each output channel has delay of up to 7.5ms.

One solution could be to decrease the delay for some channels (e.g. ch1 & 3 being the SUB don't need as much, e.g. up to 3.5ms) and increase the remaining (ch2&4 for up to 10.5). Thing is with so many boards in the field, this could seriously mess up existing configuration so not something we're going to decide with only 2 members giving their point of view..

We'll see how we can think of it in 2011..

DevTeam