Crossfire BMF1000D

Price & Contact: $779; 562-483-8111, www.crossfirecaraudio.com
All measurements @ 14volts unless otherwise specified
Frequency Response (4-ohm IHF Load, 100 Hz Ref. crossover @ highest setting}: +0 dB, -3 dB @ 241 Hz
L/R channel error, max deviation 20 Hz to 20 kHz: N/A
Signal-to-Noise Ratio (Below Rated Output, "A" weighted): -61.2 dB
Distortion at Rated Output @ 60 Hz: 0.29% @ 500 watts
Output Power (Resistive) (4 ohms @ 60 Hz to 1% THD+N): 475 watts @ 14 volts, 393 watts @ 12.8 volts, 254 watts @10.5 volts
Output Power (Resistive) (2 ohms @ 60 Hz to 1% THD+N): 808 watts @ 14volts, 656 watts @ 12.8 volts, 429 watts @ 10.5 volts
Output Power (Resistive) (1 ohm @ 60 Hz to 1% THD+N): 1233 watts @ 14 volts, 1013 watts @ 12.8 volts, 759 watts @ 10.5 volts
Output Power (Reactive)(4-ohm IHF Load @ 60 Hz to 1% THD+N): 488 watts
Output Power (Reactive) (2-ohm IHF Load @ 60 Hz to 1% THD+N): 826 watts
Crosstalk @rated output, 20 Hz to 20 kHz: N/A
Damping Factor, 2 ohms @ 100 Hz: 130
Voltage for Rated Output: 123 mV to 4.4 volts
Idle Current Draw: 1.6 amps
Current Draw @ 1/3 Maximum Power: 39.7 amps @ 409.3 watts
Efficiency @ 1/3 Maximum Power : 73.6%
Power-Up Noise: 30.6 dB SPL
Power Down Noise: 32.5 dB SPL

		Crossfire BMF1000D www.crossfirecaraudio.com
		Offering a solid 1-ohm stable design, Crossfire’s class D amplifier will be at home in any competition-level system.		Crossfire BMF1000D Specs Price & Contact: $779; 562-483-8111, www.crossfirecaraudio.com All measurements @ 14volts unless otherwise specified Frequency Response (4-ohm IHF Load, 100 Hz Ref. crossover @ highest setting}: +0 dB, -3 dB @ 241 Hz L/R channel error, max deviation 20 Hz to 20 kHz: N/A Signal-to-Noise Ratio (Below Rated Output, "A" weighted): -61.2 dB Distortion at Rated Output @ 60 Hz: 0.29% @ 500 watts Output Power (Resistive) (4 ohms @ 60 Hz to 1% THD+N): 475 watts @ 14 volts, 393 watts @ 12.8 volts, 254 watts @10.5 volts Output Power (Resistive) (2 ohms @ 60 Hz to 1% THD+N): 808 watts @ 14volts, 656 watts @ 12.8 volts, 429 watts @ 10.5 volts Output Power (Resistive) (1 ohm @ 60 Hz to 1% THD+N): 1233 watts @ 14 volts, 1013 watts @ 12.8 volts, 759 watts @ 10.5 volts Output Power (Reactive)(4-ohm IHF Load @ 60 Hz to 1% THD+N): 488 watts Output Power (Reactive) (2-ohm IHF Load @ 60 Hz to 1% THD+N): 826 watts Crosstalk @rated output, 20 Hz to 20 kHz: N/A Damping Factor, 2 ohms @ 100 Hz: 130 Voltage for Rated Output: 123 mV to 4.4 volts Idle Current Draw: 1.6 amps Current Draw @ 1/3 Maximum Power: 39.7 amps @ 409.3 watts Efficiency @ 1/3 Maximum Power : 73.6% Power-Up Noise: 30.6 dB SPL Power Down Noise: 32.5 dB SPL
		by Brian Smith

		The BMF1000D is a single-channel class D subwoofer amplifier with power ratings of 250 watts into 4 ohms, 500 watts into 2 ohms, and 1000 watts into 1 ohm. Features include a variable low pass crossover, preamp outputs with internal 2-way crossover, variable subsonic filter, a wired remote level control, and an internal bridging module that allows two amps to drive a single load in a bridged configuration. Performance One-ohm stable — there’s a term that gets thrown around a lot. Sometimes you have to wonder if they’re talking about a famous racehorse named "1 ohm" and the place where he sleeps. However, this wasn’t one of those times. Not only would the BMF1000D drive a 1-ohm resistive load, but it offered a substantial power increase over its output into 2 ohms and seemed completely comfortable in doing so. The amp beat all of its power ratings with a 12.8-volt supply, and completely destroyed them at 14 volts. In fact, at 14 volts this beast almost matches it’s 500-watt, 2-ohm rating when driving 4 ohms. On the down side, distortion is a little high at lower output levels, showing a maximum of just over 1% THD+N below about 100 watts on all of our sweeps. The amp also shows a slight change in response when driving a reactive load vs. driving a resistor. However, it should be noted that both of these characteristics seem more or less typical in the variety of class D units that we’ve seen. CONNECTIONS & ADJUSTMENTS Power and speaker connections are made via captive-style terminal blocks. Power and ground connections accept up to 4-guage and speaker connections easily accept 8-guage. On the amps input side, connections consist of RCA inputs, RCA line level outputs, telephone-style remote receptacle, and an RCA master/slave link for use when bridging two amps. Adjustments include input sensitivity, low pass cutoff frequency (45 Hz-240 Hz, 3rd order), subsonic filter defeat and cutoff frequency (25 Hz to 45 Hz, 2nd order), master/slave switch, push button remote level controller, and pre-out crossover mode select and cutoff frequency (40 Hz–250 Hz HP, 60 Hz–280 Hz 2nd order). INSTALLATION The BMF1000D offers a high degree of flexibility thanks to its preamp section. The bridging feature looks like a cool idea for those with insane desires for power, although, with only one test unit we were unable to verify its performance. Many of the preamp outputs that we see are little more than an internal Y cord, but these are actually buffered. They have just a bit less than unity gain from the RCA inputs, -118 dB S/N, 970-ohm source impedance, and output about 7.5 volts @ 1% THD+N. While the source impedance is a bit high, daisy-chaining amplifiers normally requires minimal cable runs. The subsonic filter is variable over a sensible range and should be useful to those with tuned subs, the heat sink design isn’t silly and (speaking of silly) there’s no bass boost. What’s not to like? Well I’m not crazy about the push-button nature of the wired remote, but I most likely carped about the evils of the digital interface in a head unit review or two, so we’ll just leave it at that.