RSP-901EX Real Sound Processor

You will recognize at once that the  PSP-901EX dramatically improves the sound quality of your system. The sound will be more clear and natural throughout entire range with 901EX. You will feel and experience more real sound with full of musicality. In a word, you will be convinced that the 901EX brings out the full potential of your audio system!!

The effect of "Real-Sound Processor"

Because again, our "Real-Sound Processor" has two major functions, one is making an improvement to reduce the fluctuations of speaker’s impedance frequency characteristic. The other is absorbing that counter-electromotive current from speaker including network composed of some inductors. Accordingly, the processor makes amplifier possible to drive the speaker more faithfully for sound source, improving the sound resolution and the start-up, also reproduces natural resonances. Above all you could find out the deep, rich and fascinating tonal characters you have never experienced before and also agree how amplifier could drive speaker easily!!

The RSP-901EX Is housed in a jewellery box made of American Spruce giving it the colour of a stringed instrument. The box is produced by the famous Shirakawa Company at Hida-Takayama, a beautiful historic town famous for its woodworking and Japanese traditional handicrafts.

Read the High Fidelity review here


Compatible speaker impedance

Preferably 10Ω or lower

Max amp output

Preferably 1 kW or lower

External dimensions

100 x 47 x 117 mm (W×H×D)

Weight Approx.


Package contents

2 units, 1 polishing cloth, Operational manual

* The effects will differ depending on your speaker system and the amplifier used with it.