Accuphase AD-2900

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Accuphase AD-2900 Phono Extension Card

The AD-2900 is a phono extension card designed by Accuphase, a renowned Japanese manufacturer in the high-fidelity domain. This phono equalization unit installs in a dedicated slot at the rear of certain compatible Accuphase preamplifiers. It enables the reproduction of vinyl records with exceptional sound quality, offering an optimized interface between the turntable and the preamplifier.

Versatility and Compatibility

The AD-2900 stands out for its versatility, offering compatibility with a wide range of phono cartridges. It features separate input circuits for moving coil (MC) and moving magnet (MM) cartridges, ensuring optimal matching and an exceptional signal-to-noise ratio. This extension card is equipped with two sets of input jacks for analog players, AD1 and AD2, which can be switched via the INPUT selector on compatible preamplifiers.

It is important to note that the AD-2900 is also compatible with several earlier Accuphase models, including the AD-2820, AD-2810, AD-2800, AD-290, and AD-290V, although some restrictions may apply.

Cutting-Edge Technology

High-Level Acoustic Performance

The AD-2900 incorporates cutting-edge technologies to ensure optimal sound reproduction. For MC cartridges, it uses a differential amplifier circuit with ultra-low noise bipolar transistors. MM cartridges benefit from a differential amplifier circuit using ultra-low noise FET junctions.

This design achieves sound reproduction of great purity, with extremely low distortion levels and extended dynamics. The precision of the RIAA equalization ensures faithful reproduction of the nuances and timbre of vinyl recordings.

Flexibility and Customization

Adjustable MC Load Parameters

The AD-2900 offers great flexibility in terms of load parameters for MC cartridges. Users can choose from four impedance values: 10Ω, 30Ω, 100Ω, and 300Ω. This feature allows for performance optimization based on the specific characteristics of the cartridge used.

Fixed MM Input Impedance

For MM cartridges, the input impedance is fixed at 47 kΩ, a standard value suitable for most MM cartridges on the market.

Build Quality

True to Accuphase’s reputation for build quality, the AD-2900 benefits from meticulous attention to detail. The printed circuit boards are made from fluorocarbon resin on glass cloth, a high-quality material that contributes to the stability and purity of the audio signal.

Technical specifications

Type: Pre-Phono stage for C-2900 preamplifier
Circuits: Independent differential amplifier for MC and MM
Performance: High noise suppression, RIAA accuracy
Board: Fluorocarbon resin glass, low loss and dielectric constant
Inputs: Two terminals to switch between two tonearms
Usage: Installation in the rear extension slot of the C-2900
Robust aluminum casing to protect against external noise

Technical Specifications

AD Gain
- MC: 64/70 dB (selectable)
- MM: 34/40 dB (selectable)
Input Impedance
- MC: 10/30/100/200/300 Ω (selectable)
- MM: 47 kΩ (fixed)

Compatible Models

C-2900
C-2850
C-2820
C-2810, C-2800, C-290V, C-290
C-2450
C-2420
C-2410, C-2400

Frequently Asked Questions

Is the AD-2900 compatible with all Accuphase preamplifiers?

The AD-2900 is compatible with several Accuphase preamplifier models, including the C-2900, C-2850, C-2820, C-2450, C-2420, C-2810, C-2800, C-2410, C-2400, C-290V, and C-290 series. However, it is always recommended to verify specific compatibility with your model through an authorized Accuphase dealer.

Can I use the AD-2900 with two different turntables simultaneously?

Yes, the AD-2900 is equipped with two sets of inputs (AD1 and AD2) that allow for the connection of two distinct analog sources. This enables you to use two turntables or one turntable with two different tonearms.

How can I adjust the load settings for my MC cartridge?

The AD-2900 offers four load impedance options for MC cartridges: 10Ω, 30Ω, 100Ω, and 300Ω. The adjustment is typically done via switches on the board itself or through the preamplifier interface, depending on the model. Refer to the user manual for specific instructions.

Does the AD-2900 significantly improve sound quality compared to a built-in phono preamplifier?

As a dedicated expansion card, the AD-2900 generally offers superior performance compared to a standard built-in phono preamplifier. Its sophisticated design, separate circuits for MC and MM, and flexibility in settings allow for optimal sound quality, especially with high-end cartridges.