I thought I'd posted my final 4355 equivalent schematic. I'll have to look through my LEAP files and find it again.
I thought I'd posted my final 4355 equivalent schematic. I'll have to look through my LEAP files and find it again.
Thank you VERY much!Originally Posted by 4313B
2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460
This is by any chance? http://www.audioheritage.org/vbullet...l=1#post292188
Dammit, reading through that thread again gives me crazy ideas...
"Zobel is as zobel does"
> Hmm, forgot about that thread ( thanks Paul ) ~
> Here's the network from that thread ( maybe it's not final / it is missing the Lpads );
Some Voltage Drives ;
Pic with Lpads in place ( showing impedance stabilizing coils ) ;
How does an impedance stabilizing coil work when connects to the L-Pad?
What value do you use?
How do you connect to the L-Pad?
> Think of it as a reverse Zobel circuit .How does an impedance stabilizing coil work when connects to the L-Pad?
What value do you use?
How do you connect to the L-Pad?
> So rather than flattening an impedance curve as frequency increases / it flattens ( an impedance curve ) as the frequency decreases .
> I believe Giskard has them wired directly across the drivers' 2 terminals .
> The Lpad was most likely just a convenient "standin" for the drivers own terminals ( "parallel is still parallel" , at either end of the wire) .
> Values are dictated in the same manner that a Zobels values are dictated .
So I am confused what print is the right one ?
> I'd go with a build-up of the 2010 version ( including the previously mentioned Lpads ) .
Yep, that's the one. Thanks for finding it.
R10, R11, R12 and R13, R14, R15 simulate real L-Pads. Just use L-Pads instead of those resistors. 16 ohm L-Pad on the 2441 and 8 ohm L-Pad on the 2405.
The L-Pad board in the photo above was for the 4344 MkII network that I also tried. The compression driver has the 1.0 mH 7.5 ohm DCR coil across its terminals and the 2123H has the 3.5 mH 7.5 ohm DCR coil across its terminals as per Greg's schematic.
Listening to the 4344 Mk II network side by side with the 4355 network I personally preferred the 4355 network, greater power and dynamics, which is what I expect from such a large loudspeaker.
The 4344 MK II networks are now in saeman's personal pair of 4344's. They really were intended for the single fifteen-inch based system. Turning all the L-Pads up 2 dB for the 2245H or 3 dB for the dual 2235H's didn't really cut it.
Those voltage drives are from Greg's designs in the early 80's. One is of the stock 4345 (April 1981), the other two are from the two different versions of the 4355 (May 1981 and September 1981, reshape of the 2441 drive).
Interestingly, most people want full passive networks rather than bi-amp only networks. It is more convenient I suppose.> This is the network I believe you should build up, if you want to copy Giskards super build ( just be aware that it was biamp only ).
Just checking before ordering parts L4 470u is the same as .47mh ?
Hi Kartsmart
470u is 470 micro-henries, which is equal to 0.47 milli-henries.
So, you are correct. Good luck with your project.
Baron030
Yes. They should all be standard Solen parts orderable from their website. I usually just shoot them an email and then call Dominique with my credit card number after she responds that everything is in stock.
Went to order part from solen everything seemed good until the shipping charges was applied, $163.00 can this be right ?E-mailed them but no reply. This will sure put this project over budget
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