JVC KS-AX6700

Price & Contact: Contact: 800-526-5308; www.jvc .com
All measurements @ 14V unless otherwise specified:
Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.): +0 dB, -0.77 dB
L/R channel error max deviation 20 Hz to 20 kHz: 0.9 dB
Phase Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.}: +38.8 degrees, -23.1 degrees
Signal-to-Noise Ratio (Below Rated Output, “A” weighted): -101.2 dB
Distortion at Rated Output @ 1 kHz: 0.04% THD+N @ 300 watts x 1
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N all channels driven into 4 ohms: 131 watts x 2 @ 14 volts; 109 watts x 2 @ 12.8 volts; 57 watts x 2 @ 10.5 volts
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N (all channels driven into 2 ohms): 207 watts x 2 @ 14 volts; 165 watts x 2 @ 12.8 volts; 52 watts x 2 @ 10.5 volts
Output Power (4-ohm IHF Reactive Load @ 60 Hz to 1% THD+N): 519 watts
Crosstalk (Referenced to Rated Output, 20 Hz to 20 kHz): -45 dB
Damping Factor @ 100 Hz, 2 ohms: 212
Voltage for Rated Output: 159mV to 3.5 volts
Idle Current Draw: 1.2 amps
Current Draw @ 1/3 Maximum Power: 34.9 amps @ 166 watts
Efficiency @ 1/3 Maximum Power: 34%
Power-Up Noise: 18.8 dB SPL
Power-Down Noise: 40.5dB SPL

		JVC KS-AX6700 www.jvc.com
		Power and style are the hallmarks of this two-channel beauty from JVC’s DOHC series.		JVC KS-AX6700 Specs Price & Contact: Contact: 800-526-5308; www.jvc .com All measurements @ 14V unless otherwise specified: Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.): +0 dB, -0.77 dB L/R channel error max deviation 20 Hz to 20 kHz: 0.9 dB Phase Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.}: +38.8 degrees, -23.1 degrees Signal-to-Noise Ratio (Below Rated Output, “A” weighted): -101.2 dB Distortion at Rated Output @ 1 kHz: 0.04% THD+N @ 300 watts x 1 Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N all channels driven into 4 ohms: 131 watts x 2 @ 14 volts; 109 watts x 2 @ 12.8 volts; 57 watts x 2 @ 10.5 volts Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N (all channels driven into 2 ohms): 207 watts x 2 @ 14 volts; 165 watts x 2 @ 12.8 volts; 52 watts x 2 @ 10.5 volts Output Power (4-ohm IHF Reactive Load @ 60 Hz to 1% THD+N): 519 watts Crosstalk (Referenced to Rated Output, 20 Hz to 20 kHz): -45 dB Damping Factor @ 100 Hz, 2 ohms: 212 Voltage for Rated Output: 159mV to 3.5 volts Idle Current Draw: 1.2 amps Current Draw @ 1/3 Maximum Power: 34.9 amps @ 166 watts Efficiency @ 1/3 Maximum Power: 34% Power-Up Noise: 18.8 dB SPL Power-Down Noise: 40.5dB SPL
		by Brian Smith

		The KS-A6700 is a two-channel amplifier with power ratings of 150 watts x 2 or 300 watts x 1 into 4 ohms. Features include a backlit control panel, variable bass boost, and switchable high- or low-pass crossovers. The amp’s styling bears a resemblance to the DOHC inline six-cylinder engines that are found in some of the more upscale imported sports cars. Performance On the test bench, performance from the KS-A6700 was impressive, although it was somewhat handicapped during our power response measurements (Power @ 1% THD+N) by a protection circuit. This circuit shuts the amp down for a few seconds when it’s driven hard at very high frequencies. The cut-off threshold seemed to be just above 1% THD at 20 kHz and increased as the test frequency was lowered. While this made the amp a bit more difficult to test, it shouldn’t cause problems in a relatively sane, real-world application. Connections & Adjustments Connections to the KS-A6700 include RCA inputs, speaker level inputs (with supplied harness), 1/2-inch spade receptacles for power and 5/16-inch spade receptacles for speaker connections. Adjustments include input sensitivity, bass boost (0 to +12 dB @ 40 Hz), crossover cutoff frequency (50 Hz to 220 Hz) and crossover mode select. Installation The KS-A6700 is probably a bit large for under-seat installs, but if you buy an amp that looks like this one, why put it under a seat? All of the amp’s controls are located on top under a translucent blue panel. Two large screws with coin-sized slots secure the panel. This arrangement provides protection to your carefully set controls with access that’s only a quarter and a few twists away. There’s not a lot to dislike about the amp’s control panel, it’s simple, the knobs are large, and it’s even got a light. The amp’s power and speaker connections are made via vertical barrier strips. Doing the job properly requires right-angle crimp terminals, short of that, you’ll have to use wire that’s small and/or flexible enough to bend 90 degrees in about half an inch. One point of concern has to do with the amp’s heat sink; not the whole thing, just the part that’s under that “exhaust manifold”. This plastic trim piece stirred my curiosity to the point that I just had to take it off and see what was under there. Honestly, I didn’t expect to find anything, but to my surprise, heat sink fins appeared. This, of course, led to further disassembly of the amp. Upon removing the bottom panel, it quickly became obvious that a number of the amp’s output devices are located directly under these hidden fins. Covering part of a heat sink with a trim piece is not the greatest way to dissipate heat. In all likelihood, the KS-A6700’s heat sink has enough thermal mass to keep it out of trouble in all but the most insane applications.