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The Classé Audio P-201 is a high-current stereo/mono power amplifier designed to deliver natural harmonic realism in music playback, typical of live performances. It is engineered with a focus on sound quality, upgradability, and long-term reliability.
The design philosophy behind the P-201 emphasizes repeated listening sessions to fine-tune its sound. This involves exchanging and mixing various components such as transistors, capacitors, and wiring, as well as adjusting specific operating voltages within precise engineering ranges. This meticulous process aims to create an overall sonic signature that provides the most natural and realistic musical experience.
A core aspect of Classé's design is the use of single-circuit designs across its product line. This means that all Classé amplifiers and high-level circuits in preamplifiers share the same fundamental circuit architecture. This common design is then tailored to different power levels and specific product requirements. The distinctions between less expensive and more expensive models primarily lie in the quality and complement of parts used, the extravagance of the power supply, the amount of filtering, and additional features and packaging. This consistent approach allows Classé to continuously refine and upgrade its core circuit, benefiting all models from the most affordable to the most premium, ensuring a high level of musical achievement across the range.
The P-201 is built for extreme long life and reliability in real-world conditions. This is achieved by selecting the best attainable quality parts and materials, combined with the advantages of the refined circuit design and continuous improvement process. Owners can expect years of trouble-free operation and musical enjoyment from their Classé amplifier.
Upon unpacking, the P-201 is secured in high-density, semi-rigid foam within a cardboard box. To remove the unit, the top flaps of the box should be opened and spread, allowing the entire unit to be lifted out onto a flat surface. After removing it from the plastic bag, it's important to inspect for any concealed damage. The package should include the detachable line cord, an Allen key for the top plate, and a nut driver for the output connectors. Any damage or missing parts should be reported to the dealer immediately.
For optimal placement, the P-201 should be positioned at or near its final setup location, ensuring at least 8 inches of clearance at the rear for tightening speaker output connectors. The power transformer is located at the front-center of the unit, and it's recommended to keep this area a few feet away from components that might pick up hum, such as preamplifiers, turntables, and interconnect cables. Adequate airspace for cooling is also important, with a general guideline of 6 inches above and 3 inches on each side of the unit.
The P-201 is designed for both stereo and mono operation. For stereo use, input and output connectors are clearly marked on the back, with Left/Right connections oriented from the front. The stereo/mono switch should be in the [UP] position (factory preset for stereo). High-quality interconnect and loudspeaker cables are recommended, and all connections should be tight. If input plugs are loose, they can be removed, and the ground leaves can be slightly pinched with pliers. Correct phasing of loudspeaker connections must be observed and tightened.
For mono operation, the unit must be turned OFF, and all connections, including the AC line cable, removed if it was previously used in stereo. The STEREO/MONO switch should be set to the MONO position [DOWN]. The MONO "Input" is the "left channel input" as marked, with the unused right channel input automatically disconnected. MONO output connections are marked below the connectors. If using two P-201s for mono, the same settings and connections should be repeated for the second amplifier. It's crucial to remember that the negative output connection of a bridged amplifier is NOT a ground, and therefore, a "common ground" or switchbox setup should not be used. It is also not compatible with electronic crossovers that have a common ground.
The P-201 offers both regular (RCA) and balanced (XLR) input options, but only one type can be used at a time. For regular inputs, the REGULAR/BALANCED switch should be in the "REGULAR" [UP] position (factory preset). Regular interconnects are connected to the RCA input jacks, and the balanced connectors are automatically disabled. For balanced inputs, the REGULAR/BALANCED switch must be set to "BALANCED" [DOWN]. A balanced preamplifier and balanced interconnects are required. If using a balanced preamplifier other than Classé, the wiring of the 3-pin XLR connectors must match the P-201's configuration: Pin 1: Ground, Pin 2: Positive (Non-Inverted) Signal, Pin 3: Negative (Inverted) Signal. If the preamplifier's pin configuration differs, the balanced interconnects must be modified accordingly. Once confirmed, XLR connectors are plugged into the locking XLR connectors on the rear panel (to remove, press the tab above the connector).
The P-201 incorporates a comprehensive protection circuit to safeguard its components. It features rail fuses to protect the output drivers and mosfet fuses to protect the mosfets, which act as pre-drivers for the output stage. In the event of a short circuit or other output problems, these fuses may blow to protect the amplifier. Additionally, the unit has a circuit that detects unusual distortion characteristics and/or DC content in the incoming audio signal. An AC line fuse also protects the unit, located at the back, immediately to the right of the AC receptacle.
If the protection circuit is triggered or any fuse blows, the FRONT PANEL POWER LED will blink green. In such a scenario, the P-201 must be turned OFF. After identifying and correcting the situation that triggered the protection, an attempt can be made to restart the unit. If the unit continues to enter protection mode or if protection fuses appear to have blown, it is crucial to contact a local dealer. Users are explicitly advised NOT to attempt to change a blown fuse themselves, as replacing fuses and restarting the unit without checking for component failure could lead to further, serious damage to vital components within the amplifier.
An optional remote control feature allows the power amplifier to be turned ON/OFF from a distance or another room with a simple connection from a receiver box to the remote jack on the back of the amplifier.
The P-201 integrates a newly developed special Classé "UHC TRANSFER" power supply section, which significantly increases current capacity beyond standard units. It features a magnetic flux controlled transformer cover with a brushed and anodized finish. All new Classé PCB circuit boards incorporate "UHC TRANSFER" characteristics, contributing to a reduction of wiring and connections by up to 70%. The amplifier utilizes true differential amplifier circuits from input to output, ensuring signal integrity. Its aesthetic design includes a 1/2" thick brushed faceplate with contoured handles.
Classé Audio emphasizes its commitment to quality and safety, as evidenced by its CE certification. As of July 18, 1996, Classé Audio was granted Certificate No: C401CLA1.MGS, indicating CE approval for all models in the Classé Audio product line. This means that Classé products, including the P-201, have undergone rigorous manufacturing and safety tests globally and meet all European Community CE requirements for unit-to-unit consistency and consumer safety. This commitment ensures that every Classé product is a prized investment designed for years of musical enjoyment.
General| Frequency Response | 20Hz - 20kHz ±0.1dB |
|---|---|
| Gain | 29 dB |
| Signal-to-Noise Ratio | > 100 dB |
| Input Impedance | 50 kOhms |
| Power Output | 200W per channel into 8 ohms |
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