REW & Measurment mic, confirmation |
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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for a four scoop, 4 kick system, is it possible to test only one scoop, one kick, one midtop for time alignment/IR, and apply this to all?
i understand this is not going to be accurate for the EQ etc as the coupling of drivers makes a propagation of waves all summed together at listening position, but would it be reasonable to do for IR timing only? |
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vertx
Young Croc Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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I've not worked on such a system so I can only speculate.
What your saying I've done successfully for direct radiating ported/vented enclosures - Do an alignment for one half of the left stack, then applied thee settings to the full left stack, then the right stack, and it's been OK (read: better than nothing/gets you in the ballpack) For horn loaded system, the extension of the horn path and radiating area you will see by adding more enclosures may have an effect on low frequency extension, which may impact your lower crossover point selection, which will impact your alignment settings. How much would depend really but you have nothing to lose by giving it a go and then reviewing before the gig with the full stack. |
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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this is a good point. i know that the 12s in my midtops can comfortably go down to about 80hz if needed, with authority, but i have kicks in between. i will try and measure the natural roll off of each cab with no filters applied, and use REW frequency range feature with some leway for the sweeps to avoid any damage, and of course, use low volume. |
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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as i understand it, REW can allow for you to input the sweep range for each sweep, so i imagine setting, say 900hz --> 20,000 hz may be an acceptable range for a comp driver whos spec sheet says 1000hz is the lower limit, without it breaking...
so similarly with woofers, maybe set the range to just outside its passband when running sweeps...? this fellow in his presentation seems to think doing the timing this way then no longer is affected by choice of filters, and one can then choose the best filter for flat response summation... i have no idea how phase factors into this however??? since filter choice affects phase would one then choose different filters based on what it does to the phase trace? |
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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I believe REW starts sweeps at _half_ the specified measurement frequency - that is something to be very wary of
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https://www.instagram.com/batteryacidsoundsystem/
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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meaning 40hz = 20hz?
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1092 |
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Whatch out with alligning pure on IR with subwoofers:
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3121 |
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this is the way that makes sense to me. And it seems to work. But the consensus amongst people more experienced than myself seems to be that alignment should be done after filters have been applied. |
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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round and round we go. lmao
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