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Home THX® is a set of performance standards developed by Lucasfilm for digital surround audio. Based on five full bandwidth channels and a subwoofer, these standards require identical left, right and centre speakers whose output is channeled into a wide horizontal beam across the listening area, complemented by more diffuse surround speakers.

There are two standards of Home THX: Select and Ultra. KEF Reference Series THX speakers conform to Ultra®, the most demanding.

To carry the THX logo, every product must first be approved by George Lucus' Skywalker Range test facility. No problem for KEF - after all, we've been making speakers to 0.5dB tolerance for years.

The award-winning TDM Series combines Reference Series refinement and built quality with the huge reserves of power and extended bass needed to recreate the excitement and intensity of cinema quality sound at home.

Hand built to Reference standards, 23F front speakers and 23C centre speakers are 3-way sealed box designs featuring KEF's legendary Ferrofluid-cooled soft dome 19mm (3/4") tweeter, two dedicated 80mm (3") midrange drivers and a pair of B169 'racetrack' bass drivers in discrete enclosures. With identical high order crossovers and drive units, the acoustic match is perfect - and with 175 Watts power handling, they deliver dramatic frontal 'slam'. Horizontal dispersion exceeds even THX® Ultra® standards, creating a spacious and intricately detailed 3D sound stage with startlingly real vocals; for the viewer, the sense of involvement is complete. Black Ash or White finish.

Model	Model TDM 23F	Model TDM 23C
Design	3 way, 5 driver closed box	3 way, 5 driver closed box
Frequency response at 15° horizontally off axis ±3 dB	80 Hz - 20 kHz	80 Hz - 20 kHz
LF corner - 6dB	65 kHz	65 kHz
Crossover frequency	400 Hz, 5 kHz	400 Hz, 5 kHz
Amplifier requirements	30 - 200 W	30 - 200 W
Sensitivity (2.83 V / 1m)	90 dB	90 dB
Maximum output	114 dB	114 dB
Impedance	4 Ohms	4 Ohms
Weight	14.5 kg (31.9 lbs)	14 kg (30.8 lbs)
Dimensions (H x W x D)	715 x 316 x 180 mm 28.1 x 12.5 x 7.1 in.	256 x 715 x 180 mm 10.1 x 28.1 x 7.1 in

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