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後級的速度感是少數憑藉儀器量測就可以看出端倪的音響性能數據，Spectral在1998年推出的雙聲道後級DMA-360（8歐姆負載時輸出300瓦、峰值輸出電流90安培）的上升時間（Risetime）小於300 nanoseconds（十億分之一秒）、下降速率（Settling）在1.5 microseconds內至-40dB、迴轉率（Slew Rate）為600 volts/microsecond已經非常驚人了，2000年推出的DMA-100S更將迴轉率提昇到幾近不可思議的1000 volts/microsecond！
DMA-360 Monaural Power Amplifier
Power Output
(continuous): @ 8 ohms - 300 Watts RMS
@ 4 ohms - 533 Watts RMS
@ 2 ohms - 680 Watts RMS
Output Compliment: 90 Amps peak
Frequency Response: +-0.1 dB, DC - 150 KHz
+-1 dB, DC - 1 MHz
+-3 dB, DC - 1.8 MHz
Distortion
Static: less than 0.015% from DC
to 100 KHz, typically
0.009% @ 300 WRMS/8 ohms
Dynamic: 8 Tone Cluster Test 20
KHz @ 500 Hz separation
0.01% @ 8 ohms
0.015% @ 4 ohms
Speed:
Risetime: less than 300 nanoseconds
Settling: 1.5 microseconds to -40 dB
Slew Rate: 600 volts/microsecond
Noise:
Signal to Noise: 97 dB nweighted,
107 dB ASA A
Crosstalk: 98 dB @ full power 8 ohms
Input:
Impedance: 10k ohms
Sensitivity: 1.5 volts / nominal output
Power Supply:
Line Voltage: 100 volts, 120 volts,
240 volts (internal wiring)
AC Voltage Range: +-10%
Maximum Consumption: 2000 Watts
Quiescent Consumption: 250 Watts
Operating Temperature: 0 deg. to +50 deg. Cesius range,
32 deg. to +122 deg. Fahrenheit
Protection Features:
DC Protection Servo: .5 volt range
Current Limit Onset: 90 Amps
Thermal Threshold: Protects at 85 deg. Censius,
185 deg. Fahrenheit
AC Main Fuses: 120v 5A or 220v 2.5A slo blo
Size and Weight:
Dimensions: 20" (50.8 cm) W,
7.23" (18.4 cm) H,
19.6" (49.9 cm) D,
Weight: 67 lbs, 30.4 KG Net
