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In Reply to: RE: Room correction IS REQUIRED for studio accurate bass. posted by BigguyinATL on May 31, 2016 at 09:23:45
I have a customer who has a Meridian processor that has 60 programmable digital filters for smoothing out the region below 250 Hz. When he was using a single subwoofer, he had the system professionally calibrated and was using 16 of the available digital filters.
When he switched to a distributed multisub system (the Swarm), he reset everything to flat and had the technician come in again to re-calibrate the Meridian processor. THE ONLY ADJUSTMENT NEEDED WAS TO THE LEVEL. None of the digital filters were needed for the Swarm, its native in-room response was that smooth. The technician said he'd never seen anything like it.
And because of the greatly reduced spatial variation of a distributed multisub system, this smoothness holds up pretty much throughout the room. This is especially valuable for a recording studio where one of the critical roles of the sound system is "impress the client" - namely the band that is paying you - and so the "sweet spot" has to include anyone standing or sitting in the room.
That being said, the Swarm does use an amp that has a single channel of parametric EQ built in, just in case it's needed.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Follow Ups:
EQ can tame peaks, but cannot fix nulls.
It makes sense to seek a solution that can address both challenges.
It can cure nulls but at the cost of throwing away power. You set the worst null as a base and then consider everything above a peak. But if there's a deep null you will be throwing away tons of power effectively.
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That was my point. It can be done but it's a lousy solution.
On the other hand, I get great results upstairs with the stats for several reasons: the room dimensions are favorable, I use a small forest of bass traps and am free to optimally position the speakers. I spent hours measuring the results of various trap, speaker and listening position positions.
While this is only a third octave plot, the results do indeed sound quite neutral.
impressive. curious what stats? did you use any equalization or just placement and treatment in order to have no room resonances showing?
It is an EQ-free environment simply based upon (lots of) optimization.
I do, however, use two narrow bands of the parametric EQ built into the Emotiva processor in the HT for attenuating a couple of peaks.
Even so, I cannot fix the 40 hz (and to a lesser degree 80 hz) suckouts. Room dimensions are not ideal (20x17) and I don't have the same latitude for placement. Even the following took some doing by experimenting with numerous combinations of high and low pass filter frequencies and sub output. Earthquake simulation is down somewhat, but most of the upper bass is reasonably flat.
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