Behringer DSP1124 and MK3

[PolkaMatt]

Hello,

I've seen alot of people in here that apparently run their receiver to a DSP1124 and then to the sub. What is the purpose of this? I am always looking for things to perfect the sound of my system. By the way, my reciever is a Denon 2307CI

Thanks,
Matt

[kinggimp]

a DSP1124 is an equalizer used to flatten out a subs response. im actually looking to sell one. If ur interested pm me

[z7zZz7z]

a DSP1124 is an equalizer used to flatten out a subs response. im actually looking to sell one. If ur interested pm me
what do you mean by flatten out a subs response?..
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edit: ah, i see. :)... mojave, that was very informative. :)

[mojave]

A flat frequency response is when the volume is the same at all frequencies. Due to room interactions, the bass may be 70 dB at 20Hz, 75 dB at 25Hz, 77dB at 30Hz, 73dB at 35Hz and 70 db again at 40Hz. Using the DSP1124, you are able to program it to change volumes at different frequencies in order to flatten the frequency response.

Have you ever seen a graphic equalizer with all the sliders? These are analog devices that change the volume for different frequencies and are used to flatten the frequency response. However, the sliders are set for certain frequencies and they usually only have one or two sliders for the bass.

In order to accurately flatten the frequency response, you need a sound pressure meter (SPL) or a microphone connected to a computer that has testing software such as Room Equalization Wizard (REW).

[mitchman]

So how many bands does the DSP1124 have for the lower frequencies?

Do you also use it to boost the very low frequencies (16 hz, 18 hz, 20 hz, etc...) to compensate for the roll off point of the sub? Or does that cause other issues?

Finally....(I didn't mean to ask so many questions, but this is an interesting subject I hadn't really considered)....I'm wondering if our new Denon AVR-3808CI and the Audessy reference microphone based auto setup achieves the same thing? I don't know how many EQ bands Denon has dedicated to the low frequencies, but it sure worked wonders on all the other frequencies. Our HB-1/HC-1 5.1 setup sounds AWESOME! :)

[mojave]

The DSP1124 is a digital parametric equalizer. It has 24 filters (or bands) and you can set each one to the frequency you desire. You can also set the width of the filter and the decible change. Think of the decible changes in terms of hills and valleys. You can set the height/depth of the hill/valley and the width. For example you might need a 3 db increase at 35Hz. You might set the width so that it starts to increase at 45Hz and tapers back off at 25 Hz.

The Audyssey MultEQ XT in your Denon probably doesn't have as many filters available for the bass as a stand alone device. In manual mode, you can only make a change at 63Hz, but the automatic mode may add more filters. You can read a good review at Audioholics (http://www.audioholics.com/reviews/receivers/audyssey-multeq-xt).

[mitchman]

Thanks for the Audioholics review. That was a very good read.