PH-1A

he Crown® PH-1A is a single-channel, Tbattery- or AC-powered phantom

power supply for condenser microphones. Battery power provides 17V phantom and AC power provides 24V phantom.

SINGLE CHANNEL BATTERY OR AC POWERED PHANTOM POWER SUPPLY

Features

The unit can be AC powered by using the Crown PS-24 AC/DC adaptor (not included). This adaptor plugs into a 120V AC wall outlet and provides 24V DC to the PH-1A.

When using external power, the PH-1A provides +24V DC nominal loaded voltage on pins 2 and 3 with respect to pin 1 of the microphone input connector.

Supplies a single channel of phantom power to a condenser microphone

Powered by internal 9V batteries or external 24V power supply

Supplies 17V with battery power and 24V with AC power

Rugged construction for professional use

If AC power fails, the batteries automati- cally take over

Quiet, transformer isolated

With battery operation, the PH-1A provides +17V DC nominal loaded voltage. “Loaded voltage” is the phantom voltage available with a microphone plugged in.

The PH-1A includes sufficient hum filtering for extremely quiet operation and is transformer isolated. If AC power fails, the batteries auto- matically take over.

The rugged steel and aluminum chassis is de- signed to withstand daily abuse in professional applications.

Operation

To use your phantom supply, follow this pro- cedure:

1. For AC power, plug the Crown PS-24 AC/DC

adaptor into an AC outlet providing 120 VAC, 60

Hz. Plug the 1/8 inch (3.5 mm) phone plug from

the AC/DC adaptor into the 1/8 inch (3.5 mm)

phone jack in the phantom supply.

2. For battery power, unscrew the two large

captive screws on the underside of the phantom

supply; open the chassis, and install two 9V

alkaline batteries (Duracell MN1604 or equiva-

lent). Replace the cover.

3. Plug the cable from your microphone into the

MIC IN connector.

4. Plug the cable going to the input of your

mixer or recorder into the OUTPUT connector.

Specifications

Phantom voltage supplied: 24V with AC powering; 17V with battery power. Each volt- age is nominal loaded voltage on pins 2 and 3 with respect to pin 1 of microphone input connector.

Number of channels: 1.

Microphone input connector: Female 3-pin professional audio connector (XLR-type).

Output connector: Male 3-pin professional audio connector (XLR-type).

DC power input connector: 1/8 inch (3.5 mm) phone jack, positive tip.

AC/DC adaptor: Use Crown PS-24 AC/DC adap- tor (not included). 120V AC input, 24V to 31V output, 1/8 inch (3.5 mm) phone plug output connector with positive tip.

Battery powering: Two 9V alkaline cells (Duracell MN1604 or equivalent). Batteries not included.

Battery life: 525/I hours, where I = current drain of microphone in mA. 350 hours typi- cal.

Hum filtering (inside phantom supply): 50 dB at 60 Hz; 62 dB at 120 Hz.

Dimensions: 5.0 x 2.325 x 1.750 inch LWH (12.7 cm x 5.91 cm x 4.44 cm).

Weight: 1¼ lb. (0.57 kg).

Optional accessory: 24V AC/DC adaptor, Crown model PS-24.

This cable can be unbalanced because the phan-

tom supply is transformer isolated.

5. To prevent ground loops, be sure that the

phantom supply is resting on its rubber feet.

6. To avoid draining the batteries after use,

unplug the mic cables and unplug the AC/DC

adaptor from the phantom supply. There is no

battery drain when all cables are unplugged

from the supply.

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PH-1A Schematic

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Crown Audio PH-1A specifications Features, Operation, Optional accessory 24V AC/DC adaptor, Crown model PS-24

PH-1A specifications

Crown Audio is renowned for its high-performance audio amplification solutions, and the PH-1A is a notable addition to their esteemed lineup. The Crown PH-1A is a high-fidelity headphone amplifier that provides enviable sound quality, making it a go-to choice for audiophiles and engineers alike.

One of the standout features of the PH-1A is its exceptional power output. This amplifier is designed to deliver high current and voltage levels, ensuring that headphones, regardless of their impedance, receive ample power for optimal performance. This means that even high-impedance headphones can be driven efficiently, providing a rich listening experience across various audio genres.

Another key technology in the PH-1A is its advanced circuitry design. The amplifier utilizes a sophisticated Class A/B topology that strikes a perfect balance between sound quality and efficiency. This design minimizes distortion while maximizing clarity and dynamic range. As a result, listeners can expect transparent audio playback that faithfully reproduces the nuances of every track.

The PH-1A also incorporates Crown’s proprietary signal processing algorithms, which further enhance its audio fidelity. These algorithms work to reduce noise and signal interference, ensuring that the sound remains pristine even at high volumes. This feature is particularly beneficial for studio environments, where precision is paramount.

In terms of connectivity, the PH-1A offers a variety of inputs and outputs that facilitate seamless integration into any audio setup. It comes equipped with both balanced and unbalanced inputs, allowing users to connect different source devices with ease. Additionally, it features multiple headphone outputs, enabling users to share their audio experience with others.

Build quality is another area where the PH-1A excels. The amplifier boasts a rugged chassis, designed to withstand the rigors of both studio and live environments. Its compact size also makes it easy to transport, allowing musicians and audio professionals to take high-quality sound with them on the go.

In summary, the Crown Audio PH-1A headphone amplifier combines exceptional power, advanced circuitry, proprietary processing technology, versatile connectivity, and robust construction. It caters to the discerning listener who demands uncompromising audio performance, making it a valuable asset for both casual listeners and professional audio engineers alike. With the PH-1A, Crown Audio continues its legacy of excellence in the world of sound amplification.