Dan D’Agostino Momentum preamplifier

[Leo Yeh]

Only the Momentum preamplifier can deliver the sound quality necessary to get the maximum possible performance from the Momentum monoblock and stereo amps.

Like the Momentum amplifiers, the preamplifier uses complementary balanced circuit topology for maximum bandwidth and low noise. Its audio circuitry is fully discrete, with no op amps. Zero-feedback design assures the most musical sound quality. Volume adjustment is made through a resistor ladder governed by an optical controller—the cleanest, most transparent possible method of controlling volume.

A 300 VA power supply in a separate chassis isolates the preamp’s sensitive circuitry from electromagnetic interference and noise. Separate supplies power audio and control circuitry, so the control circuits are completely isolated from the audio circuits.

The styling of the Momentum preamp perfectly complements the Momentum amplifiers, with copper accents to match the amplifiers’ unique copper heat sinks. The meter on the front face of the preamp indicates the volume setting, and a ring around the meter controls the volume. The front selector buttons illuminate to show which input is active. A radio-frequency (RF) remote control that works through walls is included.

Just like the Momentum amplifiers, the preamp uses through-hole construction and is hand-built and individually tested in D’Agostino’s Connecticut facility.

SPECIFICATIONS

Inputs 6 inputs (with theater through put)
Outputs 2 output
Dimensions, preamp 18 x 12.5 x 7 in.

http://www.dagostinoinc.com/

[Ted Chen]

Momentum前級是能發揮Momentum後級最好的搭配，Momentum前級與自家後級一樣，採用了補償式平衡線路架構(complementary balanced circuit topology)，以得到最大的頻寬與低噪訊。聲音線路為全動差無OP放大器、零回饋(Zero-feedback)設計確保了最佳的音樂性與音質。音量控制為使用光學控制階梯阻抗的設計，確保了音量控制的純淨與透明。

電源方面，為分離式的300VA電源供應，讓前級本身線路不受到電磁的干擾與噪音影響，聲音與控制的電源供應也是分離的，兩者是完全隔離的。Momentum前級的設計與Momentum後級可完全搭配，包括了獨特設計的銅金屬散熱，前面版的指針顯示音量，指針顯示外圈則是音量的控制，面板也有指示燈可顯示目前的輸入，並附有專屬的RF遙控器。