Thiel Owners

tomthiel

Thank You for the follow up to woodysticks' query. Very interesting about the correlation between a 3.5 vs. 2.2 mid-driver.

Happy Listening!

JA - the upper crosspoint is the same 3kHz with very similar tweeter low rolloffs. The principal problem comes from the lower crosspoints: CS2.2 @ 800Hz, and the CS3.5 a full octive lower at 400Hz. The driver is asked to move a lot more air with longer excursions at lower frequencies. But, as I said, there have been no failures and it works well until we get an optimized solution.

Anyone heard of a fostex driver thats similar?

Woody - the problem is that first order rolloffs engage the driver for 7+ octaves and Jim's designs control any anomalies via circuitry within that broad range. So, you can find many similar drivers, but re-engineered crossover circuits are required to replicate the original close-tolerance performance.

If I might add to @tomthiels ‘ comments; though both the 3.5’s and 2 2’s had power amp recommendations of between 50 and 250 Watts ( using standard 8 Ohm power ratings, rather than actual specific load recommendations ), as well as the lower lower crossover point of the 3.5’s,  the 3.5’s eq was boosting the bass response by up to 12 dB. Though the boost was targeted for the woofers, as Tom points out the shallow 6 dB 1st order crossover would extend the boost beyond the targeted woofers.