STONES SOUND STUDIO

Fountek Ribbon Tweeter 2way Crossover Jp3.0 Neo CD30

Application: High End 2 Way Speaker for Audio and Hometheatre speaker systems
Designers Notes:

The STONES Fountek Ribbon crossover schematic below can used as a general starting point for most 8ohm nominal 2 way high end ribbon speaker systems.
The Ribbon Crossover is set around 93.5 db Spl average power level so changing the valve of R2 to lower valves of 22 or 15 ohm with add further attenuation for level attenuation for level matching lower sensitivity bass/mid speaker systems .To increase the ribbon level to around 95 db Spl average power level remove R2 47ohm resistor. The tweeter phase ( polarity) may have to be reversed in some systems so Its a matter of experiment with polarity and component values to achieve your own personal sound quality and signature .
I recommend the use of quality components for this or any ribbon crossover design . The sound quality and sound signature of the components all interact with each other and the crossover electronic design to ultimately determine the end sound quality ,distortion ,dynamic range and low level detail.
I also recommend the following brands and type of component to be used in the tweeter crossover. WES NL non inductive resistors , SCR MKP 400V capacitors ,Solen Air Core or XLA Inductor ,QED Xtube 350 for Tweeter wiring QED Xtube 400 for Bass Mid wiring, Eichmann Copper Speaker Terminals

Designers Notes: Q&A

Subject: fountek crossover question Super Tweeter for Wide range speaker

hello,

i'm in the u.s., and found your site from the fountek site. sorry for the unsolicited note. i'm on overnight duty here, and it's a slow night.

i'm admittedly a novice, but i'm looking to adapt the fountek neo 3.0 to a wide range driver enclosure. the desired crossover frequency is 10kHz, the desired efficiency is 90dB. the tweeter would be top-mounted in a separate small enclosure, time-aligned.

i find your 4kHz and 7.5Khz diagrams (and comments) very informative, but am unable to effectively extrapolate to the 10kHz mark. i certainly appreciate the empiric aspect of all this, and understand that specific resistor values in particular are found by ear.

any assistance you could render would be most appreciated.

-john s.

The JP 3.0 Ribbon Schematic is a very general kick start point only as all speaker system crossovers are completely different , If you wish build the cct then experiment with the values to give you the sound balance and level you prefer .

OR , As an experiment You could also use say a simple 6 db network with 1uf SCR tin foil capacitor and a 8.2 ohm series resistor . Vary the resistor value up and down till you get a level match with the full range driver . Depending on the Impedance of the wide range driver this will crossover around 15Khz . Move the driver in and out towards you on top of the box to balance the phase and continuity with the driver .

PS where are you located and how did you find me

Kind Regards
Russell Storey
Stones Sound Studio