The Model P315 HO (High Output) is very rare and is considered Acoustic Research's last real effort at a world class full-range speaker. They retailed for $1995. I've owned several pairs of the legendary AR-9s and these do indeed stack up well against them.
The speakers are in very good cosmetic condition and work without any issues. The cabinets are free of scratches and have only a few very minor dings. All drivers are completely free of any damage. The foam woofer surrounds is still very stiff and firm with no signs of aging or deterioration. The mid surrounds are rubber and will never wear out. The tweeters are protected from dust and damage by a fine gauze and are mint. The foam baffle and waveguide ring around the mid and tweeter units is still good, though not mint, as seen in the photos. Nothing that will in any way effect performance. The one issue is some cat damage to the cloth on the front grills, one worse than the other, which would be best to examine in person if that's an issue because such snags are hard to photograph accurately. There is no damage to either side grill covering the woofers.
Here is a link to ae lengthy review of the speakers by Stereophile magazine for the Acoustic Research AR1. By their own admission this is essentially the same speaker as the P315 H0.:
96 dB sensitivity, so they require very little power. Great for low powered tube amps.
Sunfire internal amplifier in each speaker designed by Bob Carver. Rated 500 watts at 0.1% THD. 85% efficient, with built in excursion limiter, dynamic compressor, thermal rollback limiter, active low-frequency equalization, infrasonic filtering, and auto signal sensing amplifier turn-off.
15" polymer treated paper woofer with 4 lb magnet structure. Shielded. Two-layer, long-throw 4" voice-coil with aluminum former and vented pole-piece for heat dissipation.
Dual 5 1/4" monocoque aluminum/magnesium alloy mid drivers in D'Appolito configuration, housed in sepatate enclosure. Shielded.
3/4" particle board construction with picture-frame internal bracing. Mirror image cabinets.
Drive-units: one 1″ titanium-dome tweeter two 5.25″ aluminum-alloy cone midrange drivers one 15"side-firing, acoustic-suspension woofer powered by an internal 500W RMS amplifier.
Crossover frequencies: 100Hz active low-pass, 24dB/octave passive high-pass at 120Hz, 12dB/octave 2.5kHz high-pass, 12dB/octave
Frequency response: 25Hz-20kHz, ±3dB Nominal impedance: 8 ohms Woofer amplifier distortion: 0.1% THD at rated output Woofer amplifier S/N ratio: 90dB ref. Rated power handling: 350 watts
Dimensions: 43.7″ H 10.6″ W 22.1" D. Weight: 84 lbs each
Must be willing to pick up speakers in Los Angeles area. Will not ship. I'm happy to answer any further questions not already addressed in the ad. Please leave a phone # when responding with interest to purchase.