APPENDIX B: Technical Info

SPECIFICATIONS M•1400/M•1400i

Continuous Average Output Power, both

 

 

channels driven:
Input Sensitivity:

 

 

 

250 watts per channel into 8 ohms from 20Hz to 20kHz,

1.23 volts (+4 dBu) for rated power into 4 ohms

with no more than 0.012% THD

 

 

425 watts per channel into 4 ohms from 20Hz to 20kHz, with no more than 0.025% THD

630 watts per channel into 2 ohms from 20Hz to 20kHz, with no more than 0.050% THD

Bridged mono operation:

850 watts into 8 ohms from 20Hz to 20kHz, with no more than 0.025% THD

1260 watts into 4 ohms from 20Hz to 20kHz, with no more than 0.050% THD

Maximum Power at 1% THD:

300watts per channel into 8 ohms

500watts per channel into 4 ohms

700watts per channel into 2 ohms

1000 watts into 8 ohms bridged

1400 watts into 4 ohms bridged

Note: Power ratings are specified at 120VAC (U.S. and Canada) and 240VAC (Export) line voltages.

The M•1400/M•1400i power amplifier draws large amounts of current from the AC line with continuous sine wave testing. Accurate measurement of power requires a steady and stable AC supply. This means the line impedance must be very low to insure that the peak AC line voltage does not sag to less than 97% of its value.

If driving highly reactive loads, we recommend that the limiter circuit be engaged.

Gain:

30.25 dB (32.5V/V)

Maximum Input Level:

9.75 volts (+22 dBu)

Rise Time: < 4.4∝s

Slew Rate:

Voltage Slew Rate

> 50V/∝s

 

> 100V/∝s bridged

Current Slew Rate

> 32A/∝s at 2Ω

CMRR:

> 40 dB, 20Hz to 20kHz

Load Angle:

8(±jx) time independent at 8Ω

4(±jx) time dependent, T > 6 min. at 4Ω 2(1±jx) time dependent, T > 2 min. at 2Ω

Transient Recovery:

< 1∝s for 20 dB overdrive @ 1kHz

High Frequency Overload and Latching:

No latch up at any frequency or level.

Power Bandwidth: 20Hz to 70kHz (+0, –3 dB)

Frequency Response:

20Hz to 40kHz (+0, –1 dB) 10Hz to 70kHz (+0, –3 dB)

Distortion:

THD, SMPTE IMD, TIM

< 0.025% @ 8Ω

 

< 0.050% @ 4Ω

 

< 0.150% @ 2Ω

Signal-to-Noise Ratio:

> 107 dB below rated power into 4 ohms

Channel Separation:

> 80 dB @ 1kHz

Damping Factor:

> 350 from 0 to 400Hz

Input Impedance:

20kΩ balanced bridging

High Frequency Stability:

Unconditionally stable driving any reactive or capacitive load.

Turn On Delay:

3 seconds

Variable Low-Cut Filter:

10Hz (Off) to 170Hz, 2nd Order Bessel

Subwoofer Low-Pass Filter:

Switched: 63Hz/125Hz, 3rd Order Bessel

Constant Directivity High Frequency Boost:

2kHz to 6kHz (+3 dB points)

6 dB/octave high-frequency shelving filter, (shelving occurs at approximately 30kHz)

Limiter Section:

Complementary Positive and Negative Peak Detecting

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