Owner's Manual
Frequency Range (+/-10 dB): 45 Hz to 20 kHz
Frequency Response (+/-3 dB): 62Hz - 16 kHz
Power Rating: 240 W Continuous Program (2 hrs)
120 W (480W peak), Continuous Pink Noise (2 hrs)
90 W (360W peak) Continuous Pink Noise (100 hrs)
Maximum Input Voltage: 27.5 V RMS (2 hrs), 55.0 V peak
Maximum SPL: 112 dB ave. Continuous Pink Noise (118 dB peak)
Sensitivity: 91 dB, 1W/1m (ave. 100 Hz – 10 kHz)
Coverage Angle: 100° x 100°
Directivity Factor (Q): 7.3 (averaged 1kHz – 16kHz)
Directivity Index (DI): 8.3dB (averaged 1kHz – 16kHz)
Nominal Impedance: 8 ohms (THRU setting)
Crossover Type: 2nd order low-pass, 1st order high-pass, plus conjugate shaping
Circuitry:
Transformer Taps: 70V: 60W, 30W, 15W, 7.5W
100V: 60W, 30W, 15W
Insertion Loss: <0.94 dB at any tap setting
ru Setting: 8 nominal
Recommended Protective High-Pass: 45 Hz high-pass (24 dB/oct) for 8 operation plus 15W and 7.5W taps; 55 Hz for 30W tap; 65 Hz for 60W tap.
Transducers:
Low Frequency Driver: 200 mm (8 in), woven-berglass cone with pure butyl rubber surround with Weather-Edge frame protection, high-temp ber-
glass voice coil former, high-temp voice coil wire, optimized cone geometry, linear suspension spider, and FEA optimized motor
structure.
High Frequency Driver: 25 mm (1 in) PEI diaphragm, low-viscosity ferro-magnetic uid, and lightweight Kapton™ voice coil former.
Physical:
Enclosure Material: High Impact Polystyrene (HIPS) with 10% glass ll, painted with highly-UV resistant paint on white (-WH) version for maxi-
mum UV fade resistance.
Grille: Highly zinc-plated, nished in durable TGIC polyester powdercoating. MTC-28WMG-1 (&-WH) available with Weather-
Max™ multi-layer foam and tight-weave mesh vapor barrier backing.
Installation: InvisiBall wall-mounting system included. Two 6 mm attachment points (on top and bottom) for optional MTC-28WMG-1
(&-WH) U-bracket. Secondary safety attachment loop point on back panel.
Environmental: IP-44 per IEC529 (IP-55 when installed with the optional MTC-28WMG-1 WeatherMax™ grille and either MTC-PC2 or
MTC-PC3 panel cover.) Exceeds MilSpec 810 for humidity, salt-spray, temperature & UV. Passes MilStd-202F for salt spray
and ASTM G85 for acid-air plus salt spray. Optional MTC-28WMG-1 WeatherMax™ grille for breaking up driving rain and for
especially dicult environments.
Termination: Screw-down terminal strip, zinc-plated copper based, nickel-plated metal screws and washers. Accepts up to 9 mm outside 4 mm
inside open lugs (#6, #8, or #10 lug), plus bare wire (up to 12 AWG / 2.5 mm2). Optional MTC-PC2 and MTC-PC3 protec-
tive panel covers available to provide sealed entrance for additional weather protection.
Agency Rating: ROHS-compliant; Transformer UL Recognized per UL1876
Colors: Black (RAL9004) or white (-WH, RAL9016)
Dimensions (H x W x D): 386 x 282 x 219 mm (15.2 x 11.1 x 8.6 in); 277 mm (10.9 in) deep total when mounted on InvisiBall wall-mount bracket.
Net Weight: 6.8 kg (15.0 lbs)
Shipping Weight: 15.4 kg (34 lbs) pair-packed (for 2 speakers)
Included Accessories: InvisiBall™ wall-mounting system), 6 mm x 180 mm hex key
Optional Accessories: MTC-28UB-1 – Yolk-type U-bracket (&-WH)
MTC-28WMG-1 – WeatherMax grille with backing (&-WH)
MTC-28/25CM – Ceiling-Mount InvisiBall adapter (&-WH)
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¹
In half-space (on-wall, 2π).
At 8Ω setting. Continuous Pink Noise rating is IEC-shaped pink noise with a 6 dB crest factor. Continuous Program
Power is defined as 3 dB above the Continuous Pink Noise Rating and is a conservative expression of the system’s
ability to handle normal speech and music program material.
Calculated from sensitivity and power handling, exclusive of power compression, at THRU setting.
Half-space (on-wall) averaged 100 Hz – 10 kHz, 2.83V.
Coverage angle (-6 dB) average between 600 Hz and 12 kHz.
For protection against driving below resonant frequency and to keep transformer out of saturation.
In vertical orientation