Search found 164 matches

by Wolfgang
Fri Jan 03, 2020 4:05 pm
Forum: Speakers
Topic: Lii Audio Speakers
Replies: 35
Views: 1442

Re: Lii Audio Speakers

Ask and thou shalt receive... I now have a set of CAD drawings for the pear-shaped Lii Audio speakers. They need some work before they could be used for any CNC routing work (they're an old version of dwg file and they don't seem to have used polylines) but I do have the relevant shapes and dimensi...
by Wolfgang
Thu Jan 02, 2020 7:20 pm
Forum: Speakers
Topic: Lii Audio Speakers
Replies: 35
Views: 1442

Re: Lii Audio Speakers

Thanks Ray for clarification. I think I need to try this.Will first run some tests with bending/glueing flexi-ply/flexible-mdf in order to find out how easy (or not) it is.
by Wolfgang
Thu Jan 02, 2020 4:10 pm
Forum: Speakers
Topic: Lii Audio Speakers
Replies: 35
Views: 1442

Re: Lii Audio Speakers

I found a report - unfortunately only in German - about building suchlike speaker housings. It looks doable. The pictures speak for themselves. https://www.audionist.de/2019/05/01/das-saba-cello-ein-baubericht/ Bottom and top are 15mm birch plywood, sides are made from 3mm poplar plywood. The parts ...
by Wolfgang
Wed Jan 01, 2020 6:12 pm
Forum: Speakers
Topic: Lii Audio Speakers
Replies: 35
Views: 1442

Re: Lii Audio Speakers

I considered the Hypercubes a "sealed" box and the Lii speakers "vented", referring to this as "two principles", but I cannot understand from the drawing how the Lii speaker would work exactly. official1.jpg It doesn't look like a typical bass reflex design. Re adding an 8ohm series resistor, it wil...
by Wolfgang
Wed Jan 01, 2020 3:57 pm
Forum: Everyones Projects
Topic: 300B Headphone Amp
Replies: 30
Views: 5253

Re: 300B Headphone Amp

I am looking for a 300b preamp or headphone amp schematic, can somebody HELP ! :bounce: Top If you are looking for typical 300B sound (lush colorful warm mids) the TS Masterpiece will disappoint you. But the sound is very clean, low distortion, and the circuit is simple. I would also look in J.Bros...
by Wolfgang
Tue Dec 31, 2019 4:14 pm
Forum: Speakers
Topic: Lii Audio Speakers
Replies: 35
Views: 1442

Re: Lii Audio Speakers

I was playing with the idea to build "Hypercubes" but wasn't sure how I would be able to cut those angles precisely enough so that gluing the pieces together wouldn't end up with a complete mess. Building BLH looks like a walk at the beach compared to building the Hypercubes. But post #23 sounds ver...
by Wolfgang
Sun Dec 22, 2019 4:29 pm
Forum: Speakers
Topic: SLOB project
Replies: 200
Views: 7968

Re: SLOB project

bandwidth limit the OTL amp via it's output cap so that the Fast-10S can run full range without any crossover? Then just integrate the bass unit to suit the roll-off of the Fast-10S - that sounds like it might just need a passive lo-pass filter, especially as I have the option of 'room correction' ...
by Wolfgang
Fri Dec 20, 2019 3:11 pm
Forum: Speakers
Topic: SLOB project
Replies: 200
Views: 7968

Re: SLOB project

I think this is closely related to Ray’s SLOB project. Following this thread raised the question about the best x-over again. Some years ago I tried an OB with the PM6A in combination with my La Scala bass horns but always felt that the speed was lacking behind the bass. So I tried a midBLH with the...
by Wolfgang
Wed Dec 18, 2019 6:46 pm
Forum: Assorted Stuff
Topic: Mains filter - made things worse?
Replies: 13
Views: 873

Re: Mains filter - made things worse?

So, I wonder what else they've done to justify the price? They use hospital grade outlets with isolated ground, separate zones, star wiring "that provides similar benefits to having individual dedicated lines feeding each piece in your high-end audio system." Don't know how good their "power center...
by Wolfgang
Wed Dec 18, 2019 4:39 pm
Forum: Assorted Stuff
Topic: Mains filter - made things worse?
Replies: 13
Views: 873

Re: Mains filter - made things worse?

Just as a thought experiment, why would a mains input filter adversely alter the reproduced sound of an amplifier? From the PS audio website: "Traditional power conditioners can only affect a portion of incoming noise and are unable to compensate for over or under voltage. Furthermore, power condit...
by Wolfgang
Tue Dec 17, 2019 3:06 pm
Forum: Assorted Stuff
Topic: Mains filter - made things worse?
Replies: 13
Views: 873

Re: Mains filter - made things worse?

I only got/get really good results with PS audio power plants. https://www.psaudio.com/perfectwave-p5-power-plant/ The next best results was with the Furman IT Reference 20 with a huge isolation transformer with high power outlets and balanced ones for less power (ideal for phono section).The Furman...
by Wolfgang
Fri Nov 22, 2019 3:21 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 808
Views: 72155

Re: Remember These?

The restriction on NFB in a valve amp is the transformer, which oddly a OTL doesn't have, so al the above is not of any relevance to Steve. That's definitely a very interesting view. So, in order for me to understand this better, do you want to say with your general comment that: NFB in OTLs doesn’...
by Wolfgang
Thu Nov 21, 2019 11:08 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 808
Views: 72155

Re: Remember These?

Distortion reduction Negative feedback reduces the hum and hiss of a HiFi valve amp, but has little to zero effect on reducing audible distortion. For hiss and hum reduction we don't need big amounts of NFB but can use regulated psus and a second housing for the transformers.But of course this is m...
by Wolfgang
Thu Nov 21, 2019 10:56 pm
Forum: Everyones Projects
Topic: Remember These?
Replies: 808
Views: 72155

Re: Remember These?

Now I have the feedback levels worked out with maths and stuff, and set up right, what I can say is that it is interesting the level of distortion you will quite unwittingly accept if the distortion spectrum stays the same with output level. You do, however, notice when the distortion is not there....
by Wolfgang
Sun Nov 17, 2019 12:32 am
Forum: Everyones Projects
Topic: Steampunk!
Replies: 7
Views: 773

Re: Steampunk!

The faucet "volume control" really made me laugh.

But what's out there is truly amazing.
steam punk 2.jpg
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steam punk 1.jpg