Adding Super-Tweeters To Blodgett Theater Mains ~ Fostex T90As Sizzle 24Feb26-26Feb26

T90A Super-Tweeters... I removed my Viawave ribbon super-tweeters from Blodgett long ago, to add them to the Nest MT mains. It is past time to add some super-tweeters back to extend my Paradigm Reference Studio 100 3-way L/R mains to 4-ways and the moon. I chose the somewhat affordable Fostex T90A horns (there are 'similar' Fostex horns at $1300 each ~ I didn't touch those). The T90As are well respected and widely reviewed; they cover 5KHz to 35KHz and are very sensitive. Too, while small, they are heavy. I added a variable L-PAD and 1.5µF capacitor for a ~10KHz crossover and adjusting integration with the mains. I fabricated an inexpensive housing for the electronics when my initial supplier backed out of the buy due to tariff uncertainty. The T90A comes with a small  dowel 'stand" that I painted black and to which I added small feet in the back to level the super-tweeter over the raised lip of the towers. With the sensitivity of the towers almost the same as the horn super-tweeters I just lashed the T90As (with L-PAD) in parallel with the towers. Listening: yeah, cymbal crashes sizzle now. I always felt the PR Studio 100 high end needed some help and howdy, now they have it again. That's 'modern' Grace Potter on YouTube.

Measuring & Integrating The Super-Tweeters... The TA90s were potent... I took a number of measurements and adjusted their output back 15dB from maximum before I got them aligned to the Paradigm Reference Studio 100s. Here's the final lineup which yields a satisfying integration. This shows the left & right super-tweeters discretely and the L&R mains combined.

And here's the 'stereo' with the now 4-way mains and the sub. Yeah... I've moved the sub around a bit and AccuEQ in the Integra DHC-80.6 has played with levels as well and I see I really need to reintegrate it manually again. Else, pretty decent above 300Hz.

Finally here are all 5.1.2 channels rolling to the listening position. Again, I have to clean up the bass.

Remeasuring & Reintegrating... I remeasured and dialed in the subwoofer manually. It seems leaving corrections to AccuEQ yielded some strange settings IMO. I flattened all those out and reintegrated the bass properly to measurements and my ear. Shown are the mains only and the sub only (moved up to bolster mains' bass).

With some of the settings changed I also remeasured the high end and adjusted the super-tweeter gain. Shown are just the mains, just the supertweeters, and the resulting combined sweep.

The full sweep of the '4-way' mains is sweet now.