TransLam Alpha
Part II (Measurements)
Tang Band Tweeter at 1.5 meters; raw (no crossover). Flush mounted on large baffle. Ignore dB scale.
MCM 55-2205 5.25" woofer at 1.5 meters; raw (no crossover). Surface mounted on large baffle. Ignore dB scale.
Tweeter Woofer On-Axis response On-Axis response with tweeter wired in reverse
TransLam Alpha combined response Plot. Measured at 2 meters. I estimate the sensitivity to be around 90 dB.
TransLam Alpha Impedance.
Off-Axis response from 0 to 60 degrees. I think this was done at 1.5 meters. The speakers do have a nicely balanced sound with very good imaging.
Just for fun I added in a step response plot. Taken at 1.5 meters.
The TransLam Alpha was made entirely out of Baltic Birch. This plywood is very dense and and extremely stiff and does seem exhibit a slightly higher box resonance than what one would expect for MDF. This was taken with a tape accelerometer attached one third of the way down on the side of the enclosure. You can see peaks standing at attention at 500Hz, 1k, 2k; Ah, Physics... not just a good idea, often times its the law. This was taken with all of the cabinet damping material in place. Eh, what are you gonna do? This isn't a really big deal to me. I'll bet most MDF speakers have similar looking accelerometer plots. The speakers sound very good in a large room and a little on the thick side in a small room.