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RE: Here you go

Posted by Satie (A) on June 22, 2017 at 12:45:07

In Reply to: RE: Here you go posted by josh358 on June 22, 2017 at 07:36:29:

there is a problem of latency and group delay if you eq beyond 1st order. Thigpen is opposed in principle to having detached or delayed time behavior in any of the drivers as that eliminates transient fidelity of the whole speaker and phase fidelity at the crossover region. He thinks it is as important and possibly more so than freq response, noise or resonances. For those that appreciate spatial performance most these are the things that must be preserved, while everything else can be compromised.

In my own setup I started with the amazing spatial performance and textural detail of the Neo8 lines and tried to splice in the LF and HF drivers so as to preserve that performance. 1st order symmetrical in an equidistant arc was ideal for freq response vs. spatial performance with xo at 250, 5000Hz but there were "issues" of a general thickness at the lower mids and some loss of instrumental texture. Raising the upper xo to 11-12kHz solved them nearly completely but left a serios head in a vise problem that I just could not live with. So I tried the Apogee ET solution and dropped the mid's LP filter entirely and got all of the single driver performance back and no real head in a vise problem. So I am officially in that camp.

On the woofer xo end I tried to go as low as 100 Hz symmetrical but the lower mids became MIA so despite terrific spatial performance, the woofer had to dominate below 200hz since the line array was just too weak there. But at 1st order above 150hz the bass panels muddy the low mids and create a sense of general pressure. Tolerable but not ideal but preserves the single driver spatial performance.

When trying out wall loading schemes the bass can' be perfectly timed with the mids anyway so I went to steep LP filters and time aligned the deep bass pass band and mids by offset placement. Lost just a bit of spatial performance but removed the mud and the general sense of pressure. That is another usable compromise like the 1st order one just with a different balance of strengths and weaknesses..

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