You are correct with your findings. Below is the communication I had with Koss between the three headphones.
3:25:49 PM: Customer Support 2:
Here are the details about the Tony Bennett headphones.....
3:26:00 PM: Customer Support 2:
All three use the same elements, the ProDJ200 has two cords, one with the KTC option and a carrying case. The Tony Bennett includes a case, is a signature series headphone, and has a free CD download.
3:26:01 PM: Mike:
The first question is my question for Koss. Sorry fr the error
3:26:39 PM: Customer Support 2:
The Tony also has a detachable cord
3:26:52 PM: Mike:
Sound signature wise, which is better?
3:27:17 PM: Mike:
I like a clean neutral sound.
3:27:24 PM: Customer Support 2:
All three headphones use the same element with the same frequency response, it is just a matter of what features you are looking for
3:27:51 PM: Customer Support 2:
The ProDJ100 is a no frills, fantastic sounding headphone that has the same freq response as our Pro4aa, Pro4AAT headphones
3:28:35 PM: Customer Support 2:
The ProDJ200 has the KTC which can be used with iPhones and iPods
3:28:55 PM: Customer Support 2:
And the Tony Bennett has the detachable cord and the Duets II CD download
3:29:32 PM: Mike:
Can I get the iPhone cable for the TB version?
3:29:57 PM: Customer Support 2:
Unfortunately we are unable to provide the KTC cord with the TB version
3:30:10 PM: Customer Support 2:
You can only get it if you order the ProDj200
3:32:14 PM: Customer Support 2:
Do you have any other questions regarding the headphones?
3:32:21 PM: Mike:
Brb
3:32:25 PM: Customer Support 2:
Alright
3:33:43 PM: Mike:
I see... So the only difference are the features and accessories they come with?
3:33:49 PM: Customer Support 2:
That is correct
3:34:11 PM: Mike:
Is the TB version limited production run?
3:34:51 PM: Mike:
So the KTC cable can not be obtain at your Parts department?
3:34:52 PM: Customer Support 2:
Yes, they are limited to a certain number
3:35:16 PM: Customer Support 2:
No, the cable only comes with the Prodj200, we do not sell it separately.
3:35:31 PM: Mike:
Ok
3:36:01 PM: Mike:
Is the TB version numbered? More collectible?
3:36:29 PM: Customer Support 2:
No they are not numbered
3:36:53 PM: Mike:
Thank you for your help. You answered all
3:37:01 PM: Mike:
My questions.