4435 conversion to TAD2001

[Guido]

I finally finished the modification of the 4435 network for the use of a TAD2001 driver and must say it was worth the work.
Following I'll post the first real 2426 (Aquaplas coated) - TAD2001 comparison at our forum.
Finally I'll advice you how to modify the network.

Feel free to ask questions. It's not to hard to do though

[Guido]

First 2426AQPL vs TAD2001 on 2344 on Axis
Second 2426AQPL vs TAD2001 on 2344 30°

SPL isn't normalized to 1W/1m My mistake, but who cares? The drivers are more or less of same efficiency.

[Guido]

First 2426AQPL on 2344
Second TAD2001 on 2344

The TAD goes way high with incredible nice waterfall.
The 2426 isn't bad either

[Guido]

Impedance Graphs
Blue 2426AQPL
Red TAD2001

TAD shows similar impedance as 2426 J. Will be compensated with a crossover modification.
Lower Fs on TAD because of mylar suspension and bigger diaphragm.

[Guido]

The schematic shows L-Pad values for my prefered adjustment:
2426AQPL from earlier setup
TAD2001 from actual listening sessions

Rpar needed to be changed due to higher impedance of TAD2001
Resonance circuit (40uH) no longer necessary
Compensation C changed a bit
Slight L-Pad adjustment

Thats all

Voltage drives are with real impedance, thus a bit wavy.

Schematic is of course simplified as I use CC crossovers.

[Guido]

The real response is very similar or even identical to the predicted response

As said, this is my prefered L-Pad adjustment before (2426AQPL) and after (TAD2001) modification.
Still the L-Pads are in use to make subtle changes.

Stop lamenting about TAD prices. Go get a pair. The TAD graph looks slightly smoother but can't really show the improvement. It's incredible how this dramatic 4435 low end combined with the TAD top end sounds. Uuuuhhhh

[Guido]

That's all for now.

Rob I didn't plan to measure new Waterfalls. What do they really tell us? The TAD's will only bring a slight improvement (measured!).

I trust my ears now and simply love the result

If you guys do need some more info, just ask and I'll try to answer.

[Chas]

Stop lamenting about TAD prices. Go get a pair. The TAD graph looks slightly smoother but can't really show the improvement. It's incredible how this dramatic 4435 low end combined with the TAD top end sounds. Uuuuhhhh

I couldn't agree more Guido, my experience with TD 2002 has been nothing short of amazing. One thing I did note was a particularly long break-in period. They were good early on and continued to get better over a period of months.

[Robh3606]

Hello Guido

Great! Thanks for posting it. Do you have the waterfalls for the finished systems??

Rob