Sunday, March 12, 2017
There are only minor changes in the main system. As you can see, I have new open baffle speakers. These are inspired by NOLA speakers, formerly ALON by Mr. Marchisotto, ex Dahlquist speaker designer. They are based on four Dayton reference series midwoofers per side, RS125 on open baffle, and planar HiVi tweeter. I preferred one tweeter to short array, as it is already vertically quite directional, being quite big. As before, this open baffle is crossed actively at 160 Hz up. Woofers are open baffle 2x15" as before. All biamped.
New NOLA like speakers have significantly simpler passive crossover, as these are only upper pass for midbass (4th order) and lower pass for tweeter (2nd order), crossed at 3k Hz. They sound more coherent and very musical.
Once NOLA finished, it gave me an opportunity to redesign previous open baffle speakers. They are still work in progress, righ now on the floor in the middle. I replaced Fostex FF125K fullrange with FaitalPro 5FE120, which simplifies the crossover, as Faital has almost no breakups. Baffle was redesigned too, to allow more directivity. Ideally, these should be using 4way digital crossover, but I am not there yet.
One last update is amplifier. I was using various chip amp circuits, LM1875 was updated with LM3886, inverted with buffer sounded little cleaner and more dynamic. Recently, I purchased DartZeel clone from ebay, and I am testing it now. Sounds very musical, in spite of measuring badly, its no global negative feedback amp with quite unique features. Lack of global feedback make this amp perform ever more dynamic and musical. Generally too much negative feedback is considered bad, resulting in boring fatiguing sound. This one is opposite, very musical.
Most recently I got SANYO Plus P55 mosfet amp of ebay, and will be testing it in the main system, after its adjusted and cleaned. Once you have Sanyo Plus tuner and preamp, you must have amp too.
Posted by Ed Orvisky at 7:11 AM