, Interfaces, transformer frequency capabilities

Ed Houston2004-02-23 22:21

To start I have owned Acoustats for a long time and measured and modified the whole time. My new project is to build a single panel system (one right one left) and run a Velodyne HGS 10 as the lower octave or so. I have been reviewing the spec's and have not found the response of the transformers!!! How low can the 121 high Frequency trans play before satruation? How low can the 141 trans play? Any help here would be great.

Andy Szabo2004-02-23 22:21

The MK-141 transformer, as used in the Model One hybrid system, crosses over at approximately 150-175 Hz. It uses a 6-dB per octave slope for the transformer, and a 12-dB per octave slope on the woofer. This frequency should be considered the lower limit of the transformer. Attempting to crossover any lower could lead to transformer saturation. Additionally, a single Acoustat panel will not produce much useful bass below that point. The high frequency transformer from the MK-121 is not suitable for a hybrid system. There is not a specific crossover point between the low and high frequency transformers in the MK-121: there is a considerable overlap in their operation. I don't recall the exact range of frequencies, but I believe this overlap extends from the upper hundreds to low thousands of hertz. This is too high a frequency to crossover to a conventional woofer.

If you wish to build a single-panel hybrid system using Acoustat components, I would recommend using the MK-141 transformer, crossed over in a similar fashion to the Model One. The woofer system of the Model One was definitely its weak point, so utilizing a better woofer (or two) would offer improvement.

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