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Thread: 4435 conversion to TAD2001

  1. #1
    Senior Member Guido's Avatar
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    4435 conversion to TAD2001

    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

  2. #2
    Senior Member Guido's Avatar
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    Response

    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.
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  3. #3
    Senior Member Guido's Avatar
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    Waterfall

    First 2426AQPL on 2344
    Second TAD2001 on 2344

    The TAD goes way high with incredible nice waterfall.
    The 2426 isn't bad either
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  4. #4
    Senior Member Guido's Avatar
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    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.
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    Senior Member Guido's Avatar
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    Schematic - Voltage Drive

    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.
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  6. #6
    Senior Member Guido's Avatar
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    Result

    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
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  7. #7
    Administrator Robh3606's Avatar
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    Hello Guido

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

    Rob
    "I could be arguing in my spare time"

  8. #8
    Senior Member Guido's Avatar
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    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.

  9. #9
    Senior Member Guido's Avatar
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    Diaphragm details

    Too bad those TAD dias doesn't fit into JBL's. The're a bit bigger in diameter
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    Administrator Robh3606's Avatar
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    Hello Guido

    Well you posted them without compensation so I figured you would run them as the speakers would be used. As far as what they tell us?? The cleaner the CSD the better, how audible are diferences?? Just my curiosity to see if there are differences between the drivers asside from the obvious.

    What are the DCR's for your Inductors?? It would help if you could post them so if someone else decided to give it a go they have them.

    Glad you are happy with them. The top end definately looks improved by the swap.

    Rob
    "I could be arguing in my spare time"

  11. #11
    Senior Member Guido's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Well you posted them without compensation so I figured you would run them as the speakers would be used. As far as what they tell us?? The cleaner the CSD the better, how audible are diferences?? Just my curiosity to see if there are differences between the drivers asside from the obvious.
    The only reason for posting is that the people at TAD make such a mystery about specs (I hate it). So I wanted to have the raw TAD2001 specs shown.
    BTW not raw but with 22uF cap in series.


    Quote Originally Posted by Robh3606 View Post
    What are the DCR's for your Inductors?? It would help if you could post them so if someone else decided to give it a go they have them.
    They are close to the original DCRs. If someone really go this route I'll measure them. Promise!

    Quote Originally Posted by Robh3606 View Post
    The top end definately looks improved by the swap.
    See this is the problem with posting graphs. The REAL improvement can't be measured.

  12. #12
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Guido View Post
    See this is the problem with posting graphs. The REAL improvement can't be measured.
    Exactly... and not just in comparing JBLs and TADs. Yes, we want a flat or nearly flat response curve, low distortion measurements, clean impedance plots etc., but actually listening to these things is a real eye opener.

    I am not familiar with the sonic characteristics of the 2001, but knowing the 2002, 4001, and 4003... I can well imagine the improvement.

    With the bottom end of the 4435, I can imagine that this upgrade could result in a formidable system.


    Widget

  13. #13
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    Quote Originally Posted by Guido View Post
    See this is the problem with posting graphs. The REAL improvement can't be measured.
    Understood.
    Quote Originally Posted by Mr. Widget View Post
    With the bottom end of the 4435, I can imagine that this upgrade could result in a formidable system.
    No doubt!

    Great work Guido! Very nice.

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    Quote Originally Posted by Guido View Post
    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.

  15. #15
    Senior Member Ian Mackenzie's Avatar
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    Interesting but old news

    http://www.audioheritage.org/vbullet...ad.php?t=12901

    There seems to be a a flow of S/H trades of Tad 2001s if you know where to look but I note many Tad 2001 users are using aftermarket dias with preferred results.

    The Tad 2002 would appear a more recent design.

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