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8x 18" LMS 5400 Ultra + 4x Lab Gruppen FP14000 9 years 6 months ago #5721

  • nyt
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So I'm using MiniDSP to EQ my subs fairly flat. I have the 2x8 version for the higher voltage balanced outputs since I'm feeding pro amps and like having a low noise floor and enough headroom to not clip the signal. After MiniDSP I run Audyssey MultEQ XT32 on my Denon 5308 to smooth things further and handle the mains and surrounds.

Setting up the MiniDSP to get this flat was quite a challenge, since it doesn't behave very well EQing subs with the 96khz plugin. I will eventually test it with the 48khz plugin which may make things behave a little better. I will update once I get some time to do this. If using the 96khz plugin, just be careful under 30hz or so and test changes with a loopback or at low levels.

Anyway, here is the setup:



This is the subs without being EQ'd(purple), and with just XT32 running and no MiniDSP(green)


This is the final EQ of the subs unsmoothed. Blue is just miniDSP, red is with MultEQ XT32.



And here is the final output of the entire system

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Re: 8x 18" LMS 5400 Ultra + 4x Lab Gruppen FP14000 9 years 6 months ago #5724

  • KAMIKAZE
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Can you show in figures where was subs and microphone? Distance? Window length of your measurements? Can you share measurement file?

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Re: 8x 18" LMS 5400 Ultra + 4x Lab Gruppen FP14000 9 years 5 months ago #5932

  • kwcouch
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Just a couple of comments from my own experience with a multiple sub set up.

1. Getting a flat room response from a single mic position takes a bit of time but is certainly achievable. It helps to have a bigger room with sound treatment. And of course a good EQ. You've done a great job in getting a flat response.

2. The more difficult task is getting a good response across a broader listening area. Move the mic just a few feet and you can see a dramatic shift in the response due to room nodes and phase shifts. Since my room has 5 chairs across, it becomes even more of a challenge to get a fairly good response that works for all listening positions. Its a bit of a compromise. Of course, I always give more preference to the main listening position.

3. After I get my room EQed for a flat response, I basically undo it . A flat response is great for critical Music listening (my opinion). However, when it comes to home theater I prefer the low end impact to be just that... very impacting. I will generally push the LFE up 3 or 4 dB above the curve using my receiver LFE output for movies (sometime more depending on the movie content). In addition, I prefer a strong drum kick in my music, so I also push the 80-100 Hz and 3kHz up a couple of dB when listening to music with a strong drum content. This provides a more live concert effect.

What's funny is that we go through great pains to get this really flat room response (at one position).. and then end up fine tuning it to suit our real listening tastes.
The following user(s) said Thank You: shawnhoon

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