Search found 2268 matches

by chris661
Fri Nov 15, 2019 10:49 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 58
Views: 4388

Re: Room Treatment (Split from Owston thread)

Cool, keep us informed.

Chris
by chris661
Fri Nov 15, 2019 10:47 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2512
Views: 361919

Re: Something stirs in the Undergrowth

Good tools ain't cheap... I went for a Beyerdynamic MM1, which is about the cheapest I could find that came with a measured curve for each mic. On-axis, there's a slight rise in the last octave - it's like baffle step in speakers. With the mic at 90 degrees (ie, pointing at the ceiling or floor), th...
by chris661
Sun Nov 03, 2019 8:38 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2512
Views: 361919

Re: Something stirs in the Undergrowth

I can imagine that, if you're used to it, losing that much treble energy would be problematic. Give your ears a little while to adjust and hopefully you'll be more pleased with the performance. With regards to the distortion, it might be worth raising the sweep level a little to get the signal above...
by chris661
Sat Nov 02, 2019 8:01 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2512
Views: 361919

Re: Something stirs in the Undergrowth

It's exactly what I'd expect for a relative curve of a band-limited device. If something's putting very little out at 500Hz, then all of the measurement there will be noise. Try having it not normalised and see what you get - it'll be the frequency response of the ribbon, plus actual distortion leve...
by chris661
Sat Nov 02, 2019 11:15 am
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2512
Views: 361919

Re: Something stirs in the Undergrowth

No worries Mark. FWIW, there's an icon just outside of the top left of the graph window where you can capture the graph and export as a JPEG, PNG or anything else you like. Quite handy, that. IME, broad sweeps of frequency response can be fairly listenable once you've got used to them - it's narrow ...
by chris661
Sat Nov 02, 2019 11:10 am
Forum: Assorted Stuff
Topic: Tubes sound better??
Replies: 19
Views: 540

Re: Tubes sound better??

Steve, It's been my experience that large solid-state amps are the go-to for dynamics. I remember the meet-up at Steve C's where the Crown amp (it came to Owston, too, but not sure if you'll remember it specifically) was happy with large dynamic swings that the valve amps couldn't quite match. I pla...
by chris661
Sat Nov 02, 2019 11:07 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

I get the bar chart on the right going up to near the top, but not clipping. I do get a red 'Clip' LED on the UMC box. But I'm not sure I have this correct, how would I do this "With the mic input gain all the way up on the soundcard" ? Is this done via REW or via the Laptop's control panel option ...
by chris661
Fri Nov 01, 2019 10:47 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

Sounds very low. Here's a test. Open REW, and click the "levels" button at the top. With the mic input gain all the way up on the soundcard, tap on the side of the microphone with a fingernail. You should get red lights flashing on the soundcard to indicate the input is being overloaded, and the lev...
by chris661
Thu Oct 31, 2019 10:59 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

All the other buttons should be in the out position - one of the buttons is an (IIRC) -20dB pad on the input, which is used for when you're recording something very loud and don't want to overload the input. For your application, never ever press the "direct monitor" button - it feeds the input stra...
by chris661
Wed Oct 30, 2019 7:45 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

Looks like you could run the input gain much hotter. The UMC soundcards get slightly noisy towards the very top of the range (3 o'clock up to 5 o'clock where they max out), but anywhere up to there should be fine. If you click "measure" and then "check levels" it'll give you an idea of how things lo...
by chris661
Mon Oct 28, 2019 9:37 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

Calibrating SPL just means the vertical dB scale is accurate. ie, the speaker actually produced 90dB at 50Hz, 84dB at 1kHz, etc etc. Not of particular importance for you IMO. Your measurements might read 70dB at 50Hz, 64dB at 1kHz. Not a big deal. The soundcard calibration probably isn't necessary e...
by chris661
Sun Oct 27, 2019 8:10 pm
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

Preferences (spanner at the top right) > Output Device > select the UMC soundcard

Same for input device.
Should get you going.

Chris
by chris661
Sat Oct 26, 2019 12:02 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 10820
Views: 817799

Re: Nothing In Particular

I had an amp out for repairs (long story - it went to the UK service centre, sat there for a while, went to Italy to the manufacturer, got fixed eventually) after a firmware update bricked it. Anyway, it's back in the rack now: https://i.imgur.com/NuNMUDf.jpg In the rack, we've got (top to bottom) -...
by chris661
Sat Oct 26, 2019 11:27 am
Forum: Assorted Stuff
Topic: Speaker design/test software
Replies: 34
Views: 2069

Re: Speaker design/test software

simon wrote:
Sun Oct 20, 2019 7:04 pm
Watching with interest Mark. I'm seriously thinking about triamping with low pass and high pass filters within the amplifiers and it might be a bit approximate doing it by ear.
Gimme a shout if you'd like me to bring some measurement gear round.

Chris
by chris661
Sat Oct 26, 2019 11:25 am
Forum: Assorted Stuff
Topic: Room Treatment (Split from Owston thread)
Replies: 58
Views: 4388

Re: Room Treatment (Split from Owston thread)

Yeah, not sure I got that either. Plenty of life here.

Anyway, I'm looking forward to things being up and running there - it sounds like an excellent venue for a meet-up.

Chris