Bryston BP25, BP20 Introduction, Setup, External Power Supply MPS-1 and Remote TURN-ON Functions

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BP20/25 PreAmplifiers

INTRODUCTION

Thank you for choosing a Bryston PreAmplifier. Bryston welcomes any suggestions you may have, or comments regarding the operation of your amplifier. We consider you, our customer, to be Bryston’s most important resource, and your opinion is very much appreciated.

SETUP:

The Bryston BP-25 pre-amps, with remote-control, should be placed where there is a direct line-of-sight between the hand-held remote and the remote infra-red sensor eye located on the left side of the pre-amplifier's front panel.

If you purchased the BP0/25P or BP20/25MC, which includes a Phono section, avoid placing the preamplifier directly on top of your power amplifier. Power amplifiers usu- ally employ large power supplies and the transformer(s) in the power supplies can cause interference (hum) with the sensitive phono section inside the pre-amp.

Next, insert the 5-pin DIN cable from the outboard power supply into the “Power Supply” input connector ( 5 pin DIN) located on the rear of the preamplifier. Then plug the power supply into an appropriate AC power outlet. The pre- amplifier is powered up by engaging the push button switch located on the front of the MPS-1 external power supply. The "green" LED on the outboard power supply and the pre- amplifier front panel indicates power-on.

EXTERNAL POWER SUPPLY (MPS-1) and REMOTE TURN-ON FUNCTIONS:

The MPS-1 outboard power supply provides AC power for the BP20 and BP25 preamplifiers. It has a push button switch (push-to-set/push-to-release) located on the front and a 2 colour LED to indicate power and mute status. This LED mirrors the operation of the similar LED on the BP20/25 preamp (see the Visual Indicators section for more informa- tion). On the rear of the unit there are two terminal blocks and a two position slide switch.

The two position connector, or terminal block, accepts bare wires between 12 and 26 AWG. Insulated wires should be stripped to expose .3 inches (5/16” or 8mm) of bare wire. This provides a means of turning on the MPS-1 power sup- ply (and thus the BP20/25 pre-amp) remotely by connecting a 4 to 12 volt (AC or DC) control signal. To enable remote turn-on, the rear panel slide switch must be in the REMOTE position and the front push-button power switch must be depressed (activated).

To operate the MPS-1 power supply manually:

1st) Put the rear panel slide switch in the LOCAL position, 2nd) Press in the front panel push-button switch to turn on the unit. Press in the push-button switch again to

release the switch and turn off the MPS-1 power sup ply and the BP20/25 pre-amp.

The three-position connector provides a control voltage for remote turn on/off of your Bryston amplifier(s) or other amplifiers so equipped.

To turn on a Bryston amplifier by turning on the MPS-1: 1st) Connect the COM and +12V terminals of the three ter

minal connector on the rear panel of the MPS-1 to the IN terminals on a Bryston power amplifier intended for a 4~14V AC/DC control signal.

2nd) Put the amplifiers “EXTERNAL TURN ON” switch in the EXTERNAL position for the amplifier to respond to remote control turn-on signals (see figure 2).

Figure 1: Turning “SST” power amps on & off via the MPS1 power supply

To turn a Bryston power amplifier OFF and ON when the BP20/25 pre-amp is MUTED and unMUTED respectively: 1st)Connect the +12V SW and COM terminals on the

back of the MPS-1 to the two IN terminals on the power amp’s remote control connector.

2nd) Place the power amplifiers EXTERNAL TURN ON switch in the EXTERNAL position.

Figure 2: Turning “SST” power amps on & off via the BP20/25 MUTE switch

CONNECTIONS to OTHER EQUIPMENT:

All inputs and outputs employ fully discrete active circuitry and all input and output connectors have gold plated contact surfaces. Only cables with high quality gold plated connec- tors should be used with your pre-amp to avoid noise and distortion from the corrosion that will eventually appear on poorly plated cable connectors.

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Contents Instructions For Bryston PreAmplifiers Models BP20 & BP25 Important Safety Instructions General Specifications MPS-1 Power Supply SpecificationsAdditional Specifications for BP20/25DA Additional Specifications for BP-25MC Phono InputsSetup External Power Supply MPS-1 and Remote TURN-ON FunctionsIntroduction Connections to Other EquipmentBP25 Remote Control Optional Headphone OutputInputs OutputsVisual Indicators Phono Equalization Modules OptionalDigital Audio Input Module Optional Front Panel ControlsPage Check OUR WEB Site AT www@bryston.ca Mail Bryston Directly info@bryston.caPhone FAX

BP20, BP25 specifications

The Bryston BP25 and BP20 represent a pinnacle of engineering in the world of high-performance audio preamplifiers. Renowned for their exceptional sound quality and meticulous design, both models are integral components for audiophiles seeking unparalleled audio fidelity.

The Bryston BP25, with its robust construction and audiophile-grade components, delivers a highly transparent audio signal that preserves the integrity of the original recording. One of the standout features of the BP25 is its fully balanced differential design, which helps to minimize noise and distortion. This topology results in a cleaner, more detailed sound, making it an ideal choice for critical listening environments.

Equipped with a comprehensive range of inputs and outputs, the BP25 accommodates various audio sources, including CD players, turntables, and digital audio players. One of its notable features is the inclusion of both XLR and RCA connectors, allowing for versatile connectivity options. The BP25 also features a high-quality headphone output, making it a versatile solution for both casual listeners and serious audiophiles who demand superior performance across different listening scenarios.

On the other hand, the Bryston BP20 is a more streamlined model that inherits many of the technological advancements seen in the BP25, but in a more compact form. The BP20 retains the essential elements of Bryston’s design philosophy, offering low noise and high dynamic range. While it has fewer inputs and outputs compared to its larger sibling, the BP20 is still capable of delivering a robust listening experience that rivals many higher-end competitors.

Both preamps leverage Bryston’s legendary build quality. Constructed in Canada, every BP25 and BP20 is meticulously assembled, with an emphasis on long-term reliability and durability. The use of premium grade components, including high-quality capacitors and resistors, ensures that these preamps provide consistent performance over time.

In terms of technology, the BP25 and BP20 utilize Bryston’s proprietary DC power supply, which significantly enhances the overall audio performance. This innovative power supply minimizes unwanted noise and ripple, resulting in a pure power source for the preamps.

With their exceptional performance, diverse connectivity options, and durable construction, the Bryston BP25 and BP20 preamps represent a commitment to quality audio reproduction, making them standouts in any high-fidelity audio system. Whether you are building a new system or upgrading an existing one, both models are worthy choices that promise to elevate your listening experience to new heights.