G'day all,
I've spent the last few months building my own 4-way active system with DSP and measuring it to death. Along the way I've built a toolset that takes REW measurements and works out crossover, sub timing, EQ and timing (group delay) corrections for the main seat.
I'd like to try it on other people's systems. I'm especially keen to hear from anyone running a fully active system (each driver on its own amp channel, crossovers in DSP) who wants everything done with linear-phase FIR filters: crossovers, EQ and timing, all linear phase. That's what I run at home. You'll need something that can load FIR filters: a PC (CamillaDSP, JRiver, Roon, EqualizerAPO) or a convolution-capable DSP box. Passive speakers, receivers and miniDSPs are still very welcome too.
I'm looking for 5 volunteers, free of charge. In return, all I ask is an honest write-up of how it went, good or bad, plus a re-measurement after you've applied the settings.
What you'd get:
What I need from you:
How it works: post or PM your file and details. I'll reply with the options and charts, usually within a few days. Apply the one you like, start with the volume down and bring it up carefully, re-measure, and post the result.
First 5 complete submissions get done. If it goes well I'll open more spots.
Cheers,
Brad
I've spent the last few months building my own 4-way active system with DSP and measuring it to death. Along the way I've built a toolset that takes REW measurements and works out crossover, sub timing, EQ and timing (group delay) corrections for the main seat.
I'd like to try it on other people's systems. I'm especially keen to hear from anyone running a fully active system (each driver on its own amp channel, crossovers in DSP) who wants everything done with linear-phase FIR filters: crossovers, EQ and timing, all linear phase. That's what I run at home. You'll need something that can load FIR filters: a PC (CamillaDSP, JRiver, Roon, EqualizerAPO) or a convolution-capable DSP box. Passive speakers, receivers and miniDSPs are still very welcome too.
I'm looking for 5 volunteers, free of charge. In return, all I ask is an honest write-up of how it went, good or bad, plus a re-measurement after you've applied the settings.
What you'd get:
- Before and after charts: frequency response, bass timing (group delay) and bass decay at your seat.
- 2-3 options, each with plain-English trade-offs. One is strictly conservative: cut-only EQ, and no driver works harder than it does now. The others loosen things for a smoother response, with a small boost or a different crossover. The costs (headroom, driver excursion) are spelled out for each.
- Exact settings for your hardware: receiver settings, miniDSP biquads, or FIR filters if you run a PC, Roon, JRiver or CamillaDSP.
What I need from you:
- One REW .mdat file, measured at your main listening position, with each speaker and each sub measured separately (L, R, sub 1, sub 2...).
- Use REW's acoustic timing reference or a loopback, so the timing between speakers and subs is kept.
- Turn off bass management and room correction if you can. If you can't, say so and I'll work around it.
- Optional but helpful: 2-4 extra measurements a head-width or two around the seat.
- Your gear: receiver/processor or DSP (exact model), speakers, sub(s), mic and cal file.
- What you're hoping for: tighter bass, a boomy note gone, more slam, better imaging, whatever bugs you.
- Roughly how loud you usually listen.
How it works: post or PM your file and details. I'll reply with the options and charts, usually within a few days. Apply the one you like, start with the volume down and bring it up carefully, re-measure, and post the result.
First 5 complete submissions get done. If it goes well I'll open more spots.
Cheers,
Brad
