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Linea/Danley processor; LIR vs LR24
Mark Wilkinson:
Been working on building tunings for my speakers using the Danley SC-48.
As a test of how well does Linea's version of linear phase crossovers work,
I set up a 4-way crossover and looked at transfer and impulse of the 4 bands summed together.
Linea says there LIR filters approximate the shape of LR24 filters, so for comparison I switched all the LIR xovers to LR24s, using the same xover freqs,
and again looked at transfer and impulse for the summed bands.
The idea being, at least electrically, to see how much cleaner using linear phase crossovers is, than using minimum phase ones.
So maybe others have interest here too...
Impulse responses are quite different IMO. The LIR filter summation looks super.
Below are screen shots of the processor setups, transfers and impulse.
First is the LIR setup, then LR24
edit: I should add, the super LIR impulse has a price.... 12.6ms latency vs2.8ms for LR24
Timo Beckman:
So depending on the application you can always choose to do the 121Hz LIR as a LR filter to get latency down?
It would probably get latency down to 5-7 ms
David Sturzenbecher:
I remember hearing that these linea processors could do multiband output limiting, which could be useful to protect different passbands in a passive speaker. Have you looked into that at all? Does engaging that add phase wraps or latency?
Sent from my iPhone using Tapatalk Pro
Uwe Riemer2:
--- Quote from: David Sturzenbecher on June 16, 2018, 07:13:58 AM ---I remember hearing that these linea processors could do multiband output limiting, which could be useful to protect different passbands in a passive speaker. Have you looked into that at all? Does engaging that add phase wraps or latency?
Sent from my iPhone using Tapatalk Pro
--- End quote ---
Each output has 3 limiters.
VX, Tx and Xmax
VX can be switched to dual band operation, then you specify virtual crossover frequency and relative threshold of the upper band in reference to the lower band.
Switching to dual band limiting will add some latency, probably dependent on virtual crossover.
Under utility menu the amp/DSP reports total latency.
Linea Research has a couple of videos on Youtube
Mark Wilkinson:
--- Quote from: Timo Beckman on June 16, 2018, 05:44:20 AM ---So depending on the application you can always choose to do the 121Hz LIR as a LR filter to get latency down?
It would probably get latency down to 5-7 ms
--- End quote ---
Yes, depending on application it's an easy switch.
When I change the 121Hz LIR to LR, the unit shows that latency x-over drops to 3.3ms (not including additional fixed I/O of about 0.7ms)
I just wish the unit could do 48 dB/oct LIR. I really like steep, solves alot of main to sub summing problems IMO.
I'd use high latency 48 dB LiR for playback, and low latency 48 dB IIR for live.
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