Search found 2552 matches

by chris661
Mon Oct 09, 2023 9:51 pm
Forum: Assorted Stuff
Topic: Owston ( now darios) what are you bringing
Replies: 24
Views: 8520

Re: Owston ( now darios) what are you bringing

Ray, I'm happy to lend my 4" Fostex 2-way monitors. They've appeared there previously, and did a pretty reasonable job. Is a 4ohm load okay?

Chris
by chris661
Mon Oct 09, 2023 9:49 pm
Forum: Buying and Selling
Topic: Speaker cabinets
Replies: 14
Views: 5210

Re: Speaker cabinets

IIRC, the port inside is extendable. I aimed for a 40Hz tuning, which gives a gentler knee and a bit more power handling down low. Some other uses that I think might be fun: - Super-compact 3-way. Put a waveguided tweeter in the big hole, SB65 for midrange in the smaller chamber. - Conventional 6.5&...
by chris661
Mon Oct 09, 2023 4:05 pm
Forum: Buying and Selling
Topic: Speaker cabinets
Replies: 14
Views: 5210

Re: Speaker cabinets

Ah, yes. I remember these. They were originally used with Fostex FE126E drivers covering >500Hz, and Tang Band W6-1139 mini-subwoofers below. Plenty of grunt down to about 40Hz. The Fostex + mini-sub idea never worked particularly well for the variety of music that I enjoy, with the FE126 becoming q...
by chris661
Wed Oct 04, 2023 4:23 pm
Forum: Assorted Stuff
Topic: Owston ( now darios) what are you bringing
Replies: 24
Views: 8520

Re: Owston ( now darios) what are you bringing

I'll be bringing some mystery 3-way tri-amped speakers, which are currently under construction. Happy for them to be used by anyone wanting to demo a source. There's Dante, AES3 (digital) or analogue XLR inputs available. Steve, you can borrow the woofer section if you like. I'm aiming at a 3-400Hz ...
by chris661
Thu Sep 28, 2023 4:03 pm
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 229
Views: 262300

Re: Something Stirs in the Workshop

Careful pushing them that far - IIRC, that's Xlim, where damage is likely to occur. The last time I hit Xlim on a Beyma driver, the cone folded. Granted, it was a >500W sine sweep, starting at 15Hz, into a 40Hz ported box. Even so, that's quite a way off spec. It's possible that the rest of the T/S ...
by chris661
Mon Sep 25, 2023 4:19 pm
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 229
Views: 262300

Re: Something Stirs in the Workshop

Looks like things are progressing well in my absence. If you're looking at the maximum impedance value, I'd say don't worry about it. The simulators assume a perfect resonance, and throwing a bit of damping in there will write that off immediately. I use impedance to check the LF resonance is in the...
by chris661
Sat Aug 26, 2023 9:56 am
Forum: Assorted Stuff
Topic: Owston meet, 21 & 22nd Oct '23
Replies: 150
Views: 46415

Re: Owston meet, 21 & 22nd Oct '23

Saturday and Sunday for me please, Steve.


Chris
by chris661
Mon Aug 07, 2023 4:09 pm
Forum: Speakers
Topic: T/S parameters valid for normal listening levels.
Replies: 32
Views: 12177

Re: T/S parameters valid for normal listening levels.

I always measure and voice the speakers in room, at normal listening levels, as I found measuring at low levels gives a slightly different FR sweep. I have always assumed it was the contribution of the room, that was the nonlinear variable. I found different: I used a directional and sensitive micr...
by chris661
Thu Aug 03, 2023 6:30 am
Forum: Speakers
Topic: Quite possibly my last speakers
Replies: 43
Views: 13281

Re: Quite possibly my last speakers

It may be that a deeper composite structure is more rigid at 50 or 100Hz, but if it absorbs and re-radiates sound at 2kHz, it could colour ( or more likely de-colour) the sound in the low treble. While true, the mechanical energy at 2kHz is much smaller than at 100Hz. ie, panels are far less likely...
by chris661
Sat Mar 11, 2023 8:12 am
Forum: Buying and Selling
Topic: More solid-state amps for sale
Replies: 1
Views: 3777

More solid-state amps for sale

Hi all, I've been clearing out the garage a bit, and have realised I have way more amplifiers than I actually need. Here are the ones I'd like to move along: Behringer iNukes: - 2x NU6000DSP - £300 - 1x NU6000 - £250 - 1x NU4-6000 - £300 - 1x Cloud VTX1200 - £150 - 1x Cloud CV1000. Rough condition, ...
by chris661
Wed Feb 01, 2023 5:30 pm
Forum: Speakers
Topic: My Swansong speaker build
Replies: 210
Views: 772189

Re: My Swansong speaker build

A final point on the Owston front, if I may: You're unlikely to hear these speakers at their best there. When I took the 18" subs to Owston last time, I got the subs + speakers measuring flat with the mic near-ish the cones. Mostly just checking the integration betwee the two. When I pulled the...
by chris661
Tue Jan 31, 2023 6:35 pm
Forum: Speakers
Topic: My Swansong speaker build
Replies: 210
Views: 772189

Re: My Swansong speaker build

Had another day at Colin's last weekend, and we set about tweaking these speakers further, to see what could be done about the notch in the response at 100Hz. After trying a few measurement positioned, we realised that the problem was in the vertical plane: moving the mic a few feet upwards filled i...
by chris661
Fri Jan 27, 2023 2:37 pm
Forum: Speakers
Topic: Triaxial
Replies: 2
Views: 3969

Re: Triaxial

BMS has been doing similar for a while: https://www.bmsspeakers.com/index.php-1 ... ms_15cn890
But not with an 18" cone!

Neat way of getting full-range out of one box, and I can imagine an 18" stage monitor being popular with drummers.

Chris
by chris661
Sun Jan 22, 2023 10:28 am
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 229
Views: 262300

Re: Something Stirs in the Workshop

Just a quick note that FIR-based DSP can manipulate frequency and phase responses independently of each other.

ie, you could dial in a boost/cut without any phase shift, or dial in phase shift without changing the frequency response.

Chris
by chris661
Sat Jan 14, 2023 3:29 pm
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 229
Views: 262300

Re: Something Stirs in the Workshop

Steve,

If you're thinking about 2.5" drivers, the SB65 is worth a go. Nice little driver with a copper sleeve on the polepiece for demodulation.

Chris