Originally Posted by OJ Bartley
Cam Man, I don't want to alarm you, but there seems to be a problem with all your pics of the build and the finished speakers. You MUST have posted them, because... who would post a thread about new speakers without posting pics of the new speakers? Right..?
Well... post pics!
Hahaha. Yes, I empathize. My apologies, but I zoomed through the build on each of these over two weekends, and they are now fully installed as of two days ago (Sunday 1/22). I did not make any photos of the flat pack build as this is the same for all. If you've seen one, you've seen them all. Since I bought with the assembled crossover, there is nothing to show you there.
Attached are two photos of the final installation with the HTM-12s and 88 Special with their concealing grills removed. I think more important than photos of this are my reflections on performance so far. I have not had time since Sunday to measure the acoustic response of the HTM-12s nor re-accomplish the Audyssey Pro calibration. The speakers the HTM-12s replace are the legacy JBL Synthesis S2C which is also a CD/waveguide design, but a speaker that sounds considerably different from the DIYSG speakers here. None the less, they were/are a very well designed speaker and have very smooth anechoic response which I confirmed. Therefore, there was little for Audyssey to do but eliminate the boundary gain imposed by the "baffle wall" installation. The HTM-12 also has a very smooth response as Matt has shown us. I predicted that since both the S2C and HTM-12 are good designs with similar smooth response, and they are installed in the same manner/location, it is possible that the acoustic response of the HTM-12s could be very good immediately on installation. To my very happy surprise, that is the case. I will soon measure to confirm what I subjectively hear, but read on.
To cut to the chase, I am just blown away so far by the HTM-12 as they perform holistically with the 88 Special
as an LCR "team." They sound magnificent together
! That is also a clue that very little EQ of the HTM-12s will be needed (as the 88 Special is already EQ'd via Audyssey Pro). The synergy that these three speakers, being from the same "family," provide is just superb! My son and I listened extensively into the night Sunday and last night, and everything is just amazing to experience
I experimented with various crossover points, and found that 80Hz is nominal in my large room. It supports the need for bass management and high output. In the photos you see that there is a compartment below each HTM-12. These were originally intended to contain subs. This turned out to be a bad location, creating a terrible deep node at 43Hz. These compartments are now bass traps. Fortunately, moving the subs to the compartment behind the TV is acoustically friendly. Crossing the HTM-12s and the 88 Special at 80Hz solves this with zero compromise to the perceived performance of the LCRs.
There had been some mention by Matt that the HTM-12 may really strongly benefit from a baffle wall installation. Although not typical, you can see that the HTM-12 fits like a glove in the screen wall and performs pretty much as a baffle wall.
The performance of these three LCRs with the six Volt-10LX surrounds and four subs (and Audyssey Pro room correction) is just stupendous! I can't wait to deploy the AT screen and a movie! When I get the time to measure, I'll get back to you with what I found.