Search found 179 matches

by Wolfgang
Tue May 26, 2020 11:34 pm
Forum: Everyones Projects
Topic: Any Interest - Soft Start PCBs
Replies: 4
Views: 94

Re: Any Interest - Soft Start PCBs

He has made that very complex just to avoid using a £2 AVR (IMHO). Not sure why bother using a thermistor instead of some resistors as they will be out of circuit after half a second. But at least that’s the way I do it. It's really too complex! Not necessary IMO. Using a thermistor instead of resi...
by Wolfgang
Mon May 18, 2020 5:29 pm
Forum: Everyones Projects
Topic: The Other 13E1 SE-OTL
Replies: 161
Views: 23436

Re: The Other 13E1 SE-OTL

Patience is a virtue Wolfgang...
Very mysterious answer... :wink:

...and I am working on something in order to overcome the dynamic limitations of 1-2W SE OTLs with the help of Maid reg.
by Wolfgang
Mon May 18, 2020 4:59 pm
Forum: Everyones Projects
Topic: The Other 13E1 SE-OTL
Replies: 161
Views: 23436

Re: The Other 13E1 SE-OTL

Very nice, Ray. Your patience pays off.

But it looks like you won't use Maida reg. for the 13E1 tubes. Why?
by Wolfgang
Wed May 13, 2020 12:53 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 125
Views: 17795

Re: Inverted OTL with 6SN7/6AS7

Metalwork is one of my pet hates, what did you get and how are you finding it? I got the E4. Now it has been replaced by the “Evolution 4”. Basically the same but with the one piece spoilboard and a stronger router mount, important for precision which was actually the only weak point IMO with the E...
by Wolfgang
Tue May 12, 2020 4:13 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 125
Views: 17795

Re: Inverted OTL with 6SN7/6AS7

I finished my InvOTL some time ago and thought the result is worth a picture. InvOTL.jpg DC offset can be easily readjusted with the two pots in the back. The mV meters can be turned ON/OFF for checking and getting it down to 0mV. I mounted all the tubes on a separate aluminum board (would have been...
by Wolfgang
Sat Mar 28, 2020 1:31 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

If that's the frequency response of the driver in a baffle then it will work even at lower frequecnies. Must be a hell of driver!
by Wolfgang
Thu Mar 26, 2020 6:08 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

I wonder how they would perform with a full range unit, like the Lii Audio ones, run open on a small baffle? They subs are limited to 120Hz max with the internal x-over because of servo control precision. The higher the frequency the harder for the servo to react precisely enough. Using the LFE inp...
by Wolfgang
Wed Mar 18, 2020 1:55 am
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

Obviously a misunderstanding.
The drivers are the SW-12-08
http://www.rythmikaudio.com/GR_drivers.html
can be ordered here: http://gr-research.com/drivers.aspx

Couldn't find the link for the H-frame plans so I attached the pdf.
H-frame 2.pdf
(81.11 KiB) Downloaded 35 times
by Wolfgang
Tue Mar 17, 2020 3:50 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

And the OB subs? The subs come with a 370W RMS into 4 ohm amp (linear psu) per channel with the servo control board built in. A370XLR3 (2).jpg All controls are analog which is not my favorite way of doing this kind of stuff so I bypass them (LFE input ) and use my digital x-over for controlling Kli...
by Wolfgang
Mon Mar 16, 2020 11:16 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

Simon, I listen with active (TS 300B PP/Burmester clone) modified Klipsch La Scala horns. The photo shows what I did. KH_sub.jpg The original sound has changed a lot, more open and relaxed than the typical KH sound. The midrange horn/300B PP needed some EQ for sounding lush and full rather than anem...
by Wolfgang
Sun Mar 15, 2020 11:38 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

I am taking it, that by a previous comment offered, I got your location quite wrong. No problem, John. The resonances are not easily heard until you remove them.. The bass sounds so clean, fast, and real compared to my previous sub (active/closed box) that it probably will take a while before I sta...
by Wolfgang
Sun Mar 15, 2020 2:09 am
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

To me a rattle sounds like the speaker is exceeding its Xmax . You are right, Steve! I've found the problem. These amps have a lot of extra settings and the servo settings in combination with the typical x-over/PEQ settings was not correct. The servo control (extension filter) can be set to low/mid...
by Wolfgang
Sat Mar 14, 2020 6:26 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Re: Sound damping material

Some would consider MDF only fit for building prototypes, because it's cheaper than "proper" materials. The only material which sounds more "dead" if you knock on it is some kind of resin which is used for those very expensive speakers (like WilsonAudio etc). Normally MDF is considered to be acoust...
by Wolfgang
Sat Mar 14, 2020 3:25 pm
Forum: Speakers
Topic: Sound damping material
Replies: 32
Views: 2887

Sound damping material

I have finished my first OB sub with servo controlled woofers (second one in the making) and was wondering if cheaper damping sheets than "No Rez" or "Black Hole 5" would have the same effect? http://gr-research.com/norez24x27sheet.aspx/amps/amps.htm http://www.speakercity.com/Merchant2/merchant.mvc...
by Wolfgang
Sun Feb 23, 2020 4:24 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 58
Views: 3498

Re: Tannoy Enclosure

This is a very interesting discussion. And all the necessary components are in the mix like critical damping, room interaction, speaker behavior at resonance frequency, DF of amp, historic development of speaker-amp-relation etc. The only thing this discussion is still missing IMO is to draw the rig...