It's what's inside that counts.

Hidden inside the SRS1500 is an FR Series amplifier rated at 600 watts. But that nominal rating only tells part of the story. If you had to use an external amplifier, it would have to deliver 1000 watts or more to produce the same effect.

That's because the SRS1500's high-current amp is optimized to drive the long-throw 15-inch low-frequency transducer. The amplifier "knows" how to handle the speaker's impedance variations... and it's designed to put its whole output into just the frequency range of the subwoofer. At any impedance, it delivers massive current for extremely fast response and tight control.

This intimate interaction between amp and LF transducer also makes for extreme reliability. The amp knows what to expect and it can be built to survive stuff an external amp couldn't handle. On the back is a massive rear-panel heat exchanger to protect the amp's output devices, but if you touch the heatsink fins after the SRS1500's been cranking at max output for several hours, you'll discover that it's running as cool as a proverbial cucumber.

Also inside is a precision stereo/mono high-pass electronic crossover. It takes the full-range signal and divides it into two parts. Frequencies under 120Hz go to the internal amp. Frequencies above 120Hz are detoured to the main full-range speakers. Unlike primitive, passive band-pass filters, this sophisticated 18dB-per-octave electronic circuitry introduces zero phase distortion to either the low- or high-pass signals. In other words, what goes in undistorted also comes out undistorted.

On the outside are XLR input sockets, XLR thru/high-pass outputs, a recessed level control and a 0° to 180° phase switch (for matching up the SRS1500 with the rest of your system).

Surprisingly small. The SRS1500 takes up less than three square feet of floor space and yet it generates more bass than most 18-inch subwoofers.

Eighteen inches of low-frequency transducer packed into a 15-inch frame.

Because we own one of the world's top transducer manufacturers, we didn't have to resort to "off-the-shelf" woofers ordered out of a catalog. We could create exactly what was needed to make the SRS1500 kick butt and take names. We had the speaker wizards at RCF cook up a mutant hybrid design that was fast, had long cone excursion, and could handle massive power for days on end.