Hi everybody ,
please be friendly to newbie on forum...
I'm from Denmark.
Industrial designer by education ,love to build speakers ,love sound.
Would like to invite for sharing ideas with a goal to fine tune methodology for measuring active speakers and producing filters as a result.
Would be nice to stay firm with REW software.
Most commonly methods used for producing filters it is directly imported from speaker manufacturers making speakers with PASSIVE FILTERS as a target - all kind living areas . Shortly- massive production.
This process looks like this:
1.Producing drivers for speakers measurements done In the anechoic chamber.
This is perfectly OK and acceptable unless measurements can be taken for your listening space.
2.Manufactures uses measurements taken In the anechoic chamber and that data it is base for filter production.
This is perfectly OK and acceptable,because speaker it is for mass production and must to cover needs of anyone.
3. Such speakers arriving to customers room. From this moment on it is whole bunch of speaker measuring methodology principles and software tools ( like Dirac Live )and other commercial products ( sound traps,diffuses and much more such ) to mach that speaker sound like in In the anechoic chamber.
With that I have a problem .
Active speaker system have upper hand technologically to passive filters and are very flexible with FIR and PEQ filters.
When we (DIY) speaker builders are not targeting to massive production market ,but most of the time but we trying to build best speakers for drivers/room or just speakers concept,it makes sense to have solid how to tutorial step by step guide for building active filters. Most popular is minidsp products[https://www.minidsp.com/],i think.
At the moment this how I do:
1. Staring point for microphone is at listening position ( have a hard time to justify 1meter or 0,5 meter distance) and sweeps at 75dB .
Sweeps are done at 0,15,30,45 degrees and averaging all scans in to the one in REW . That is done to the right and left speaker separately and for individual drivers. Implementing "House curve" for woofers in REW. Exporting results to rePhase produce FIR filter. PEQ firters using just for fine tune up.
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