FTW-21 - It's Back!

Imagine if you can, every picture, vase, dish and window in your home rattling uncontrollably as air pressure begins to build in your theater room.  That's what will happen if you get the FTW-21.  Nowhere else will you find a driver capable of displacing as much air as this driver can, and do it with ease and finesse.  The FTW-21 utilizes much of the same technology as the UXL-18 - same motor, voice coil and careful attention to detail.  We figured why change a winning combination?



PS Voice Coil

The PS voice coil made exclusively in-house by IST, combines the very best technologies available.  It starts with a special non-metallic former, used because it does not generate eddy currents in the magnetic gap like metallic formers do.  This in turn reduces distortion significantly.  Heavy coated aluminum wire is CNC-spun using glues that have temperature ratings exceeding the magnet wire coating itself.  The adhesive is then heat bonded to ensure long lasting operation - a very time consuming and expensive process.  The PS design extended length topology ensures excellent heat dissipation and reduces power compression.


Low Distortion Motor

From our machine shop comes a CNC-turned magnet structure using quality North American steel, high energy ferrite magnets and strong adhesives.  Unlike Chinese-based steel products, there are no car doors in the steel used here!


Aluminum applied in the right areas to minimize distortion and a thin, non-ferrous shield is placed within the motor to cut down on stray flux.  We then run this motor through our magnetizer four times to ensure complete saturation of the ferrite slugs.  Like the PS voice coil, these modifications are something you may never see, but the sonic improvements will be nothing short of spectacular. 


Cone and Spider

The FTW-21 uses a strong craft pulp pressed cone and thick foam surround to ensure high volumes, minimal flexing and low fatigue.


Double thickness Conex spiders are used for maintaining linear stroke.  This material is extremely resistant to tearing regardless of the stresses placed on it.  Twin-run heavy tinsel leads are fed through the spider in a way that eliminates tinsel slap.  This is yet another time consuming assembly process that is performed by hand.




We recommend using the FTW-21 for home theater use, where you would experience its full capabilities.  One unit would be sufficient for most average sized rooms, but we know those looking to get the FTW-21 are far from average.  Best used in sealed enclosures, or multiple units in an Infinite Baffle setup.








76mm IST PS Series low distortion voice coil
Fs (Hz)


Cast aluminum basket

Re (Ohms)


Low distortion motor with demodulating rings



Internal stray flux shielding



Heavy Craft pressed pulp cone



Extra wide heavy foam surround for high excursion

Cms (mm/N)


Conex spiders with double woven tinsel leads

Rms (kg/s)


Large spring loaded connectors

Mms (grams)


1200 watts RMS power handling

BL (Tm)


Excellent for home theater



34mm Xmax excursion for maximum output

Sd (cm^2)


Lp (2.83v/1m)




Suggested Box Sizes

Outside Diameter - 54.3cm

Sealed - 170L (6cu. ft.)

Mounting Diameter - 50.9cm

Bass Reflex - 283L (10cu. ft.) 24Hz

Mounting Depth -   26.4cm

EBS - 700L (25cu. ft.) 17Hz tune


Infinite Baffle - *

Price -  $700.00

Out of Stock