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My Selenium D250X finally arrived. She is one of the few 1″ midrange compression drivers available in the market. The majority are tweeters. As a bonus, she has a screw thread, meaning I can screw directly onto the Klipsch K-700 horn. Her diaphragm is phenolic, not titanium. I’m fine with that as long as she doesn’t sound “rough”. According to her specs, her power handling is 150W at 500Hz (12dB/oct). Frequency Response spans 400~9,000Hz. Let’s see how well she mates with the K-700. Klipsch K-700 with Selenium D250X
Fig 1 is the RAW response of the K-700 with the D250X. No crossover is used and the plot is not smoothed. I was quite horrified by the plot. There are a multitude of issues I have with the response. Firstly, it’s very uneven. And a chunk seems to be bitten off from 3.5~6kHz. I normally avoid drivers with responses like this but since I bought this D250X already, I’ll give it a go.
Fig 2 is the Impedance of the K-700/D250X combo. Her largest peak at 1.2kHz isn’t too bad. I may be able to get away with not using a Series LCR to flatten the peak. The next step is to work on the crossover when I mate this combo with a woofer. Frankly, I’m a bit at a lost as to how to proceed. Unless otherwise stated, all measurements were made in Full Space (4 pi) with the mic at 36 ins, tweeter axis. Impulse Window=5ms. No smoothing applied. |
March 18, 2026Drivers Evaluation, PRO DRIVERS
