Search found 2496 matches

by chris661
Tue Aug 09, 2022 6:31 pm
Forum: Assorted Stuff
Topic: Owston 2022 - What're you bringing?
Replies: 4
Views: 123

Owston 2022 - What're you bringing?

Per the title :) I'll start: - 2.5-way speakers that made an appearance last year, but with updated tweeters & crossovers. - Crown MA5002VZ amp, which I'm happy to lend out for if anyone needs more power - MOTU M4 USB audio interface/DAC - Laptop as source - Maybe a surprise If anyone wants acou...
by chris661
Mon Aug 08, 2022 8:17 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

Nice to see it's not me going around in these circles. Intuitively, the "apply a short-circuit to give maximum electro-magnetic braking" makes sense. However, I can sort-of see the argument for preventing current flow in the motor at the breakup frequency. That way, the motor can't produce...
by chris661
Fri Aug 05, 2022 6:17 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

I suppose it could. With a cone with a strong resonance at 4.5kHz, a 1.5kHz input would have its 3rd harmonic amplified acoustically. I don't think a high driving impedance at 4.5kHz would rescue that. Something that I would've liked to see in the Purifi paper is a higher drive level. Their "af...
by chris661
Fri Aug 05, 2022 2:26 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

Except they aren't dissimilar other than the fact that series and parallel notches are inherently so when used for EQ / response-shaping. The object of the exercise in the pdf (see pp.4 - 5) was to create the same baseline frequency response (that's the baseline for comparison), via either a series...
by chris661
Mon Aug 01, 2022 8:28 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

The bottomless notch, in that implementation, is a network which will give a near-dead-short at a particular frequency. That gives maximum electrical damping at that frequency, and (via the woofer inductor forming a potential divider) puts a deep notch in the frequency response. Without the bottomle...
by chris661
Sun Jul 31, 2022 2:03 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

Further thought: the dips in the lower-mid/upper-bass area might be floor and/or ceiling reflections. I ended up adding another driver near the floor to fill in the dips - https://www.audio-talk.co.uk/phpBB3/viewtopic.php?t=8257 Which worked well. The speakers gained a solid upper-bass "slam&qu...
by chris661
Sun Jul 31, 2022 1:00 pm
Forum: Speakers
Topic: Purifi-based monitor - options
Replies: 103
Views: 11165

Re: Purifi-based monitor - options

Some measurements here - from approx 1m away : First the full combo, then the Purifi MidBass only. Not quite what I expected actually, although the 3 to 10kHz area is a bit raised. What I'm not seeing is an obvious lump around the 3 to 4kHz area where the Purifi ought to be sticking up in the mix. ...
by chris661
Tue Jul 26, 2022 9:01 pm
Forum: Speakers
Topic: My Swansong speaker build
Replies: 74
Views: 1809

Re: My Swansong speaker build

I'd written up a reply, and then got logged out before I managed to send it. Here's V2.0. A quick note on the amp at Owston, Nick's OBs, etc: - The amp was a Crown MA5002VZ, and has been well looked after. In its day, it was a very good amplifier. I wasn't particularly surprised, then, that it held ...
by chris661
Mon Jun 20, 2022 8:19 pm
Forum: Speakers
Topic: PERSPEX QUASAR ver 2.0 prototype build
Replies: 324
Views: 65873

Re: PERSPEX QUASAR ver 2.0 prototype build

First order, Mark, and fairly high up IIRC - knocking off a couple of dB at 5kHz-ish. Difficult to define "aggressive", but there are a few things that might be happening. Some of them psychoacoustic, some of them inherent in the drivers. I'm glad they appear to have been well-received. Ch...
by chris661
Mon Jun 20, 2022 5:55 pm
Forum: Speakers
Topic: Fun at a theatre - 3x Faital 18XL1800
Replies: 6
Views: 484

Re: Fun at a theatre - 3x Faital 18XL1800

Thanks, gents. I used two of these subs for a village festival over the weekend and they did well with the following settings: - EQ to be flat to 20Hz (requiring lots of EQ and power) - Set a highpass filter to pick the -3dB point, balancing output vs extension. -3dB@33Hz came out about right for th...
by chris661
Mon Jun 20, 2022 5:43 pm
Forum: Speakers
Topic: PERSPEX QUASAR ver 2.0 prototype build
Replies: 324
Views: 65873

Re: PERSPEX QUASAR ver 2.0 prototype build

Having spent some time with these speakers myself (not in perspex, granted), I'd be interested to read your impressions, Mark.

Chris
by chris661
Fri Jun 10, 2022 9:40 am
Forum: Speakers
Topic: another cunning plan
Replies: 44
Views: 3278

Re: another cunning plan

Ed, As far as I can tell, "depth" can be attributed to two things while we're listening: Ratios of direct-to-reverb sounds in the recording. Jennifer Warnes's cover of Bird on a Wire is a really good example here. Skip to 2.57. Lead vocal is front and centre, but the echoed lines are to th...
by chris661
Wed Jun 08, 2022 10:29 pm
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 116
Views: 49888

Re: Something Stirs in the Workshop

Sorry Steve!
A bout of Covid has knocked me on my arse. Hoping to be back to normal service soon.

Chris
by chris661
Sun May 29, 2022 4:12 pm
Forum: Speakers
Topic: Fun at a theatre - 3x Faital 18XL1800
Replies: 6
Views: 484

Fun at a theatre - 3x Faital 18XL1800

I posted this on diyAudio, but some of you here might be interested - https://www.diyaudio.com/community/threads/fun-in-a-theatre-3x-faital-18xl1800.386725/ It's nice to be getting back to live events. I've had a few weddings and things like that, but this one really reminded me of why I do it. Chris
by chris661
Sun May 29, 2022 3:39 pm
Forum: Speakers
Topic: What should I hear?
Replies: 70
Views: 3670

Re: What should I hear?

I've tried to present useful information that might allow you to explore new facets to this hobby, and I've been met with "anathema" and "I'm not reading that". Why should I bother?

I'm done. Best of luck to you.

Chris