Rockford Fosgate 1100a2

Price & Contact: Call for pricing; 602-967-3565; www.rockfordfosgte.com
All measurements @ 14 volts unless otherwise specified
Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz,1 kHz Ref.): +0 dB, –.23 dB
Phase Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.) — Phase Warp Out: +19 degrees, –10.25 degrees
Signal-to-Noise Ratio (Below Rated Output, “A” weighted): 119 dB
Distortion at Rated Output (@ 1 kHz): 0.041% @ 275 watts x 2
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1% THD+N, all channels driven into 4 ohms: 383.9 watts x 2 @ 14 V; 317.4 watts x 2 @ 12.8 V; 215.7 watts x 2 @ 10.5 V
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1% THD+N, all channels driven into 2 ohms: 487.1 watts x 2 @ 14 V; 466 watts x 2 @ 12.8 V; 340 watts x 2 @ 10.5V
Output Power (4-ohm IHF Reactive Load @ 1% THD+N @ 60 Hz bridged): 973.6 watts x 1
Crosstalk @ rated output, 20 Hz to 20 kHz: –72.3 dB
Damping Factor @ 100 Hz: 1737
Voltage for Rated Output: 300mV to 6.1V
Idle Current Draw: 1.4 amps
Current Draw @ 1/3 Maximum Power: 79 Amps @ 389 watts
Efficiency @ 1/3 Maximum Power: 35%
Power-Up Noise: 14 dB SPL
Power-Down Noise: 14.8 dB SPL

		Rockford Fosgate 1100a2 www.rockfordfosgate.com
		Raw power is the concept behind this 2-channel monster from Rockford Fosgate.		P1100a2 Specs Price & Contact: Call for pricing; 602-967-3565; www.rockfordfosgte.com All measurements @ 14 volts unless otherwise specified Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz,1 kHz Ref.): +0 dB, –.23 dB Phase Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1 kHz Ref.) — Phase Warp Out: +19 degrees, –10.25 degrees Signal-to-Noise Ratio (Below Rated Output, “A” weighted): 119 dB Distortion at Rated Output (@ 1 kHz): 0.041% @ 275 watts x 2 Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1% THD+N, all channels driven into 4 ohms: 383.9 watts x 2 @ 14 V; 317.4 watts x 2 @ 12.8 V; 215.7 watts x 2 @ 10.5 V Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1% THD+N, all channels driven into 2 ohms: 487.1 watts x 2 @ 14 V; 466 watts x 2 @ 12.8 V; 340 watts x 2 @ 10.5V Output Power (4-ohm IHF Reactive Load @ 1% THD+N @ 60 Hz bridged): 973.6 watts x 1 Crosstalk @ rated output, 20 Hz to 20 kHz: –72.3 dB Damping Factor @ 100 Hz: 1737 Voltage for Rated Output: 300mV to 6.1V Idle Current Draw: 1.4 amps Current Draw @ 1/3 Maximum Power: 79 Amps @ 389 watts Efficiency @ 1/3 Maximum Power: 35% Power-Up Noise: 14 dB SPL Power-Down Noise: 14.8 dB SPL
		by Brian Smith

		The Power 1100a2 is a two-channel power amp featuring gold plated connections, switchable high- or low-pass crossovers with variable cutoff frequency, a 275-watt x 2 power rating into 4 ohms, and the classic Rockford cheese-grater from hell heatsink. Also included is a bass boost circuit with wired remote and an adjustment ambiguously marked “Phase Warp.” Performance Pansy, wimp, or wuss are not adjectives that you’re likely to come across in descriptions of the 1100a2. However, powerhouse or current hog fit the bill quite well. Driving a 4-ohm reactive load, this beast produced nearly a kilowatt on our test bench and nearly 1400 watts driving a 4-ohm resistive load with a 14.6 V supply. (Rockford Fosgate recommends the use of large power capacitors to bolster the amplifier if you experience any problems with your stock electrical system.) This isn’t to say that you’ll be disappointed with its real-world performance, but we had to parallel two power supplies just to feed this thing. Our normal test DC supply has a current limit of about 120 amps, and it fell short by a considerable margin. Noise floor, crosstalk, and turn on/off numbers are really low. Connections & Adjustments Connections to the 1100a2 include RCA inputs and outputs, a spade-type remote turn on connector, and captive-style receptacles for speaker and power connections. Adjustments include input sensitivity for each channel, crossover mode select, crossover cutoff frequency, bass boost, and Phase Warp adjustment. The Phase Warp appears to be an all-pass delay. This might prove useful in a multi-speaker SPL setup. It would allow for close phase matching of multiple woofers. This, in theory, could allow for a higher SPL at the frequency for which they were adjusted. The limitation of this circuit is that it would only work at one frequency, and it would have to be fairly low — perhaps below 500 Hz in a car. Installation Installation of the 1100a2 should be quite straightforward. Rockford has thoughtfully included all the fasteners you’ll need for mounting as well as hex wrenches that fit the power and speaker connections.