Search found 67 matches

by tallevan
Wed Jun 22, 2022 9:44 am
Forum: Omni Bass/Key/PA Speakers
Topic: My 3D printed Diffraction horn for compression drivers OTOP12
Replies: 18
Views: 2521

Re: My 3D printed Diffraction horn for compression drivers OTOP12

You might try the wayback machine at web.archive.org.

Look for https://uwpltd.com around the time the post was made.
by tallevan
Mon Jun 06, 2022 10:29 am
Forum: Build Threads
Topic: 36” T48
Replies: 6
Views: 340

Re: 36” T48

That build looks very good to me.

You are dealing with the warping in the prescribed way, lots of clamps and some straight battens.

Honestly, your shop is far better equipped than anything I can hope for. Nice drill press.
by tallevan
Mon May 23, 2022 3:34 am
Forum: Everything Else
Topic: Off reservation, Duke Lejeune 4 x 10 build.
Replies: 5
Views: 325

Re: Off reservation, Duke Lejeune 4 x 10 build.

I have a few heads, the WT-400 is my go-to. I use it almost all the time. One of the finest bass amps ever made, IMO. The tube is there partially for marketing. From memory, the two triodes of the tube are put in parallell and used to warm up the sound a bit, not as a gain stage. So really a solid s...
by tallevan
Sun May 08, 2022 4:45 am
Forum: Build Threads
Topic: Jack 10 Lite Build
Replies: 147
Views: 6235

Re: Jack 10 Lite Build

Following your use of laser-cutting with great interest.
Are the black edges of your pieces caused by carbonisation of the wood by the laser?
I'm wondering if that would affect the bond strength of the PL adhesive.
by tallevan
Thu Apr 28, 2022 11:37 am
Forum: Build Threads
Topic: T45 stack
Replies: 44
Views: 2294

Re: T45 stack

Now I agree with Anton. Nailed it.
by tallevan
Thu Apr 28, 2022 3:04 am
Forum: Build Threads
Topic: T45 stack
Replies: 44
Views: 2294

Re: T45 stack

Use a hand saw, starting at each corner and working towards the centre. One could temporarily add a straight edge/ cutoff or some such, to the side edge, to act as an initial guide for the handsaw. I would use Tom's approach. A cheap handsaw will cut through brads as well, and if you are careful th...
by tallevan
Tue Apr 19, 2022 5:48 am
Forum: Jack
Topic: Xmax lower than recommended recycling drivers
Replies: 5
Views: 420

Re: Xmax lower than recommended recycling drivers

Hi Job, I recycled a non-recommended, out-of-spec woofer for a Jack 10 some time ago. The thread is here: https://billfitzmaurice.info/forum/viewtopic.php?f=30&t=25520 It wasn't the same situation, it was just an experiment. But it worked out OK. Not as well as if I purchaced one of the recommen...
by tallevan
Thu Mar 17, 2022 4:05 am
Forum: Jack
Topic: J12L w/Piezos: How to add "Bass Only" option
Replies: 10
Views: 942

Re: J12L w/Piezos: How to add "Bass Only" option

I have been given a link, and here it is... https://billfitzmaurice.info/forum/viewtopic.php?f=14&t=19211 The tweets don't have to exactly half, but instead, have the upper 4 tweets as the half (and the remainder would be off). Then, the other two switch positions would be on, or off. That is a...
by tallevan
Wed Mar 16, 2022 2:49 am
Forum: Jack
Topic: J12L w/Piezos: How to add "Bass Only" option
Replies: 10
Views: 942

Re: J12L w/Piezos: How to add "Bass Only" option

I think you would need a 3PDT switch. In case you are not familiar with this, it's like three SPDT switches ganged together. One "switch" would connect/disconnect the +ve line from the jack to high-pass filter. The other two "switches" would bypass the low-pass filter at the +ve...
by tallevan
Tue Mar 15, 2022 8:27 am
Forum: Jack
Topic: J12L w/Piezos: How to add "Bass Only" option
Replies: 10
Views: 942

Re: J12L w/Piezos: How to add "Bass Only" option

I think you would need a 3PDT switch. In case you are not familiar with this, it's like three SPDT switches ganged together. One "switch" would connect/disconnect the +ve line from the jack to high-pass filter. The other two "switches" would bypass the low-pass filter at the +ve ...
by tallevan
Fri Mar 11, 2022 9:20 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: TLAH crossover question
Replies: 10
Views: 607

Re: TLAH crossover question

I think you can live without the low pass filter, but it's not optimal. Nothing will explode, but whatever high frequencies the woofers can reproduce they will, along with the tweeters. Probably the mid frequency response of the woofer will also change without a LP filter, Bill would know. An amazin...
by tallevan
Wed Mar 09, 2022 9:10 am
Forum: Introduce Yourself
Topic: Best cab for JBL d140
Replies: 4
Views: 740

Re: Best cab for JBL d140

Indeed, those are very old speakers. Here is a thread describing their construction and origin: http://bassoutpost.com/index.php?topic=2555.0 They don't look like they handle a lot of power, maybe 100W or so? Also likely to be quite tired. If I was determined to use them, I might try making a single...
by tallevan
Wed Feb 23, 2022 7:52 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: Answering questions when people see my THTLP
Replies: 32
Views: 1683

Re: Answering questions when people see my THTLP

I think the distortion you are hearing occurs in the higher frequency ranges. It's hard to hear distortion induced by overloading a sub driver, but that doesn't mean it acts as a filter for distortion on the recording. This would be reproduced accurately and almost entirely through your tops, I reck...
by tallevan
Wed Feb 16, 2022 5:43 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: 18'' drivers recycling
Replies: 12
Views: 682

Re: 18'' drivers recycling

Not to be a wise-arse, but according to the plans the Qts for that driver appears to be too high for the Simplexx 18 at 0.5.
Maybe more suitable for a sealed enclosure from what I read.
But I read a lot of things..
by tallevan
Mon Feb 14, 2022 5:45 am
Forum: Pro Sound Setup
Topic: Splitting my rig?
Replies: 21
Views: 1775

Re: Splitting my rig?

I think Tom is correct.
The copper one upright, two or three cable ties and some hot glue should do it.

A good article on inductor positioning here:
http://www.troelsgravesen.dk/coils.htm