Search found 2423 matches

by chris661
Sun Mar 07, 2021 8:01 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

Funny, I was talking to Colin about the same subject recently, Scott. I said I have never really liked standard dome tweeters since I heard a good ribbon ; however the beryllium ones he's used recently are a different matter - the first time he demoed them at Owston I knew they were a significant i...
by chris661
Sun Mar 07, 2021 11:25 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

Well, in the passband the distortion was still -30dB to -40dB, so not particularly easy to detect in listening. Measuring the other 288 will be informative.

Chris
by chris661
Sat Mar 06, 2021 6:54 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

Looks like you've got noise floor above the distortion. Might be worth increasing the drive level a bit, but a good result nonetheless.

Chris
by chris661
Sat Mar 06, 2021 4:22 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

IslandPink wrote: Sat Mar 06, 2021 12:34 pm Yes, so I measured the Radian 745 Neo Be , I used the Azurahorn AH425 .
Looks more like it.
I'd suggest the other compression drivers need some attention, then. Might be as simple as the alignment being slightly out.

Chris
by chris661
Sat Mar 06, 2021 9:48 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

Mark, The high distortion across the board worries me. I went through my files and dug out the response & distortion curves for an 18Sound ND1460 on an RCF HF94 horn. They're decent components, and were being tested outdoors at "reasonable" levels from a Powersoft T604 amplifier. Disto...
by chris661
Tue Mar 02, 2021 3:12 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

Mark, Please heed my previous recommendation and implement a highpass filter. Harmonic distortion of that level indicates that something is very unhappy indeed, and you might be on the verge of breaking something. I'd suggest doing a loop-through of the USB interface, and then a further test with th...
by chris661
Mon Mar 01, 2021 7:17 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

The distortion on the interface should be vanishingly low. To test, plug the output into the input (loopback measurement) and see what you get. You could also do a measurement with the amplifier in play. You'll likely need to engage the -20dB pad on the Behringer's input. The harmonic distortion get...
by chris661
Sun Feb 28, 2021 4:00 pm
Forum: Speakers
Topic: Another speaker thread
Replies: 197
Views: 7404

Re: Another speaker thread

He’s also only running them down to 200hz. True, but a bump at 150Hz will pull the acoustic crossover down, resulting in overlap. Something that might be interesting would be to apply some FIR processing to the Kef eggs. In theory, square waves on & off axis should be possible - they're coaxial...
by chris661
Sun Feb 28, 2021 12:54 pm
Forum: Speakers
Topic: Another speaker thread
Replies: 197
Views: 7404

Re: Another speaker thread

Just a quick FWIW that I have a pair of Kef HTS3001SE on my desk (the SE versions have the "tangerine" phase plug). I sealed up the boxes and applied a big boost at 35Hz, plus a cut in the 150Hz range (probably the "chestiness" that Vic notes) and a couple of other response tweak...
by chris661
Mon Feb 22, 2021 9:33 pm
Forum: Buying and Selling
Topic: Purifi PTT6.5 drivers
Replies: 6
Views: 500

Re: Purifi PTT6.5 drivers

I'll be very interested to hear how you get on with them. They've been on my radar for a while, but I can't quite justify the price at the mo.

Chris
by chris661
Mon Feb 22, 2021 9:32 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

It's possible I've missed something, but it sounds like the compression driver is being run without a highpass filter, except whatever the OPTs are doing. I'd strongly recommend adding the highpass before further evaluation. I'd also consider adding the ribbon - the rolled off HF won't be helping th...
by chris661
Mon Feb 22, 2021 8:01 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2776
Views: 631548

Re: Something stirs in the Undergrowth

So I had a listen today with the 300B & 45 amps wired in. It sounded quite good at first, quite dynamic and some beef to the male vocals. Then I started hearing things wrong with female vocals, on the horn. Ran the horn on its own. I always thought that the Yuichi was nice on everything. Not so...
by chris661
Sat Feb 20, 2021 11:44 am
Forum: Speakers
Topic: Interesting video about designing out speaker shortcomings
Replies: 27
Views: 890

Re: Interesting video about designing out speaker shortcomings

They're really interesting drivers, although the cost is quite off-putting. If anyone's interested in getting lots of bass from a small box, Kartesian Acoustic are doing some cool drivers. I have a pair of their ferrite 4" drivers here, which get down to the mid-30s in something the size of a s...
by chris661
Thu Feb 18, 2021 9:00 pm
Forum: Speakers
Topic: What would you do with these drivers?
Replies: 82
Views: 5151

Re: What would you do with these drivers?

it does show that most music doesn’t have much sub 50 hz content. Depends what you listen to. I could name plenty of music with sub-40Hz content, and quite a lot with sub-30Hz. There are a couple of nutters in America that intentionally make music with strong infrasonic content, which they use many...
by chris661
Sat Feb 06, 2021 11:27 am
Forum: Speakers
Topic: Another speaker thread
Replies: 197
Views: 7404

Re: Another speaker thread

By some kind of duping presumably? Well, when I did it, I just put a load of blu-tak on the join between dustcap and cone. Worked well enough, and was removable. For permanent installation, I'd think about silicon sealant or similar. If it was mine, though, I'd reach for EQ before messing with the ...