Carver PM-700
A pro-audio amp rated at 350 watts per channel into 4 ohms. It is the Series II amp that Carver built for the road and the rack.
Overview
The PM-700 is a Carver Professional power amplifier from the PM Series II line. Carver's own advertising said what it was for: an amp "with the guts it takes to go the distance, night after night, year after year." That is marketing copy, not an independent verdict, but the spec sheet behind it is concrete. The PM-700 is rated at 350 watts per channel into 4 ohms with both channels driven and distortion held below 0.1% THD. It sat at the bottom of a three-model Series II range that climbed through the PM-950 (475W) to the PM-1400 (700W). For a working sound company in the mid-1990s, the 350W figure was the entry ticket to the family rather than the headline act.
Carver made the PM-700 very configurable. The rear panel has XLR and 1/4-inch TRS inputs, switchable between balanced and unbalanced operation. The front panel has an 11-detent level control that can be defeated entirely for fixed-gain installations. A mode switch selects stereo, dual mono, or bridged mono operation, and internal jumpers allow true parallel mono, input polarity reversal, and input sensitivity changes. So one amp could be a stereo PA amp on Friday, a bridged mono sub driver on Saturday, and a fixed-level install amp the following week. Rental houses and installers could not afford to stock a different box for every job, and this saved them from it.
The Series II design uses a dual two-step Class H power supply, which Carver claimed made the amps more efficient at peak power. It is backed by redesigned power supply transformers and additional capacitor storage aimed at low-end punch. Cooling comes from an internal airflow system driven by an ultra-quiet two-speed fan, which matters in a control room as much as on a stage. Five protection circuits guard the output stage, and the amp carried a full five-year warranty, a confident offer for gear destined to be thrown in and out of trucks.
The optional plug-in modules are where the PM-700 gets interesting. Carver offered the CX-2 stereo electronic crossover, built around Linkwitz-Riley networks with separate second-order infrasonic filters. Plug-in components give ten selectable crossover frequencies between 80 Hz and 7 kHz and ten infrasonic filter frequencies between 10 Hz and 100 Hz. The AT-2 stereo precision attenuator allowed input level adjustment in 0.5 dB, 1 dB, and 10 dB steps from 0 dB down to -59.5 dB. Both were user-installable options on the PM-700, PM-950, PM-1400, and CA900. A PowerLink module added remote computer control of six functions and monitoring of nine key parameters, including output current, over MediaLink protocols.
That dual identity — road-tough and clean enough for the studio — is the pitch Carver was making; Mix (May 1996, p.157) described the new PM-series amplifiers as designed specifically for pro-sound applications, with rugged construction and reliability that made them ideal for the abuses of the road while their accurate sound and excessive power suited critical studio work.
Carver positioned the Series II amps as "light heavyweight champions," smaller and lighter than most comparable models. Anyone who has lugged a conventional 350W-per-channel amp up a load-in stairwell will see the appeal. The amps were made in the USA, and the advertising made a point of it alongside the component quality and quality-control claims. Power-up sequencing and a front-panel power-connected indicator came standard across the Series II line. Sequencing helps when you power a rack of amplifiers in order to avoid a breaker trip or a thump through the house system.
The PM-700 is an odd fit for the vintage collector. It is professional gear - rack-mount, fan-cooled, built for abuse - rather than a living-room hi-fi piece, so it tends to surface through pro-audio channels rather than the usual collector market. The plug-in modules are the wrinkle. A PM-700 with the CX-2 crossover or AT-2 attenuator installed is more complete than a bare unit, and those modules are the kind of accessory that goes missing over decades of rental duty. Buyers should confirm which modules, if any, are present. They should also check the condition of the two-speed fan and the protection circuitry, since those systems keep a 350W amp alive under load.
It is not a museum piece in the way a Silver Seven or a Phase Linear is — it is a tool, and it was sold as one. But tools built this specifically, with this much configurability and a five-year warranty behind them, are exactly the kind of gear that earns a second life in a home studio rack decades later. The PM-700 does not need to be rare to be worth owning. It needs to work, and the spec sheet suggests it was built to.
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