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Thread: some TAD help needed if possible.

  1. #1
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    some TAD help needed if possible.

    Hey All

    I have some TAD TN-4 crossovers, which are made to run either 2 x 1601's, or 1 x 1601 bass unit. It's a 2 way crossover which comes advertised as switchable between these two configurations.

    Here's the weird bit -

    I can see no switch, or obvious way of ''swapping'' the crossover between 2 x 1601 , and 1 x 1601.


    Just using the TN-4 as is (with my 1 x 1601 p/side) I am getting a bass-light presentation, which leads me to assume I need to do " whatever TAD say I should " to swap their crossover between dual bass cone and single bass cone use.

    So what's the problem?

    ..

    agghhhh.. I just can't get ahold of ANYONE at Pioneer who knows the first thing about TAD products, most especially the 'TN' series of crossovers. I am peeing into the wind, and just getting wet trousers.

    It's a huge frustration after spending so much on TAD drive units, and the crossovers (all bought used admittedly..but still!!! agggggh!)


    Does ANYONE have a contact at TAD?
    Anyone know anyone who knows someone at TAD?


    Fingers crossed

    Thx

  2. #2
    Senior Member richluvsound's Avatar
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    Kenji !

    Try sending Kenji an email . I know he's doing a lot of work with the TAD studio monitors at the moment .

    Rich

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    Senior Member stephane RAME's Avatar
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    Club double 16"
    "Laissez les Bons Temps Rouler"

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    http://home.tubebbs.com/attachment/2...516902AKpO.jpg

    Hi Stephane!

    Thanks for posting that. This is the only thing that I have, no other paperwork.

    I can't see anything from this drawing which shows me how to swap the crossover from dual 15's to a single 15. I wonder if I'm missing something obvious (?)


    Rich - I've sent Kendrick Sound an email, but I don't hold out too much hope of reply. I've emailed his inbox before, and received no reply.


    Anyone have any contacts in TAD?

  5. #5
    Senior Member stephane RAME's Avatar
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    Hi,
    To 2 HP, it says "dual parallel," why not, but it's dropped the impedance to 4 ohms.
    So changes the cutoff frequency, compared to 1 HP (8 ohms).

    Stéphane
    Club double 16"
    "Laissez les Bons Temps Rouler"

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    Hi Stephane,

    If my understading is correct, using 2 x 15" p/ch would increase efficiency by approx 3db.

    there ''must'' be a change needed in the crossover to change from 1 x 15 to 2 x 15 configuration, to account for this efficiency change.

    am I wrong on this?


    thx

  7. #7
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    Got a reply from Kenji.


    He doesn't have a clue

    Still, at least he got back to me.


    Anyone got a contact at TAD ?

  8. #8
    Senior Member pos's Avatar
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    Maybe IWT would know, I think he did clone some TAD filters in the past.

  9. #9
    Senior Member jerry_rig's Avatar
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    As mentioned in a link below, I have been using the TN-4 for some time now and have tried it with several different woofer combinations. However, using a 1601c, and with a proper amplifier, the bass is definitely not bass-lite. I'm not sure what cabinet you are using or how it is tuned, but there may be an issue there.

    Second, if you want to run two 1601s (or 1602 or 1603), try them in parallel off of the LF terminal. Yes, the result will be 4 Ohms, but at least according to the chart, the crossover point and slopes will be fine. I have not tried this myself, but I would think it would work fine. I am pretty sure there is no switch or other modification necessary.

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    Hi Jerry

    I'd maintain - that my limited knowledge of electronics... surely a change MUST be necessary to the crossover when you add more woofers.

    Its my understanding that every added woofer adds 3db to the efficiency....

    therefore adding an extra bass unit.....this would make the bass 3db more efficient than the mid-range.



    which will in effect make the bass louder when you add 1 woofer to a crossover.

    therefore, there MUST be some modification or change needed to the TN-4 to make it work with 1 woofer or 2.


    I've emailed ''TAD USA'' ...hope they have some contact in TAD JAPAN..

    failing that, can anyone write in Japanese?

  11. #11
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by bottleneck View Post
    I've emailed ''TAD USA'' ...hope they have some contact in TAD JAPAN..
    Good luck on that one.

    They aren't terribly good at getting back to people even regarding current product, the monitors have been discontinued and out of production for years.


    Widget

  12. #12
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    I assume all the capacitors are under this board?

    I am unable to see the following link for some reason (DNS failure) so I don't know what the jpg is of. Hopefully a schematic.

    http://home.tubebbs.com/attachment/2...516902AKpO.jpg
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    Last edited by 4313B; 10-12-2012 at 07:55 AM. Reason: reason for inability to see link

  13. #13
    Senior Member jerry_rig's Avatar
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    Yes, the capacitors are under the board and are sealed in some kind of epoxy. A buddy of mine has "reverse engineered" the entire design by testing the components, so I could theoretically get you the schematic (not promising this). Apparently, TAD uses only one or two capacitor values and combines them in various circuits to get the desired results.

    If you are worried about the LF being 3dB too high, you could easily insert an L-Pad.

  14. #14
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    hi jerry -

    if you could ask him if he has the schematic, that would be brilliant. We should be able to reverse-engineer the change there.

    I'd need to use the L-pad on the horn, as I have too little bass in relation to the horn rather than too much. IMHO the insertion of an L-pad is always audible, so would rather find another route if I can...

  15. #15
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    Quote Originally Posted by 4313B View Post
    I assume all the capacitors are under this board?

    I am unable to see the following link for some reason (DNS failure) so I don't know what the jpg is of. Hopefully a schematic.

    http://home.tubebbs.com/attachment/2...516902AKpO.jpg


    Nice rug, HeHeHe.

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