Yamamoto Sound Craft AT-03-3A Top Quality Attenuator Unit

In addition to the overwhelming amount of information unique to the passive attenuator and its productivity in high range, it has a soft, warm tone. Bass and stretch without shortage, light, delicate, bright and comfortable sound

The fewer circuits the music signal passes through will increase the freshness of the sound and improve the sound quality. The attenuator part of the AT-03-1A,AT-03-3A adopts a volume adjustment function called L-type that switches 28-point resistors. The L-pad type has only two resistors that enter the signal source, minimizing the sound quality based on the resistor. The loss of a passing resistor is minimized by the adoption of a surface-mounted resistor, and noise during contact switching is rarely generated.

The step interval of each switch point can be adjusted in 2dB steps from 0dB to -38dB, allowing fine adjustment. The minimum volume can be narrowed down to -65dB, and any level adjustment is possible. The left and right level deviation at each volume setting is within real 0.2dB, and the difference between the left and right levels, which is the weakness of the continuous volume unit, is negligible. Impedance is a 50kΩ impedance that can be connected to any device.

The volume adjustment switch and input switching switch of this machine adopt the 45SD type of Seiden Co., Ltd., which has a reputation, to improve reliability and usability. After a number of listening tests, DALE's 1W type of surface-mounted resistor is used for the volume control unit. For the internal wiring of this machine, high purity copper single wire 6N 1.2mm diameter was used for all wire materials. Wire material is used in the tube of Teflon which is the best insulation.
For the internal wiring of this machine, high purity copper single wire 6N 1.2mm diameter was used for all wire materials. Wire material is used in the tube of Teflon which is the best insulation.

The dial and feet are ebony.

Format	28 Step Volume Adjustment Attenuator
Impedance	50kΩ
Input System Input	3 lines only
Output	2 lines only
Input Switch	Yes
Dimensions	200(W) 270(D) 97(H) mm
Weight	2.5kg

The passive attenuator, which does not have an amplification circuit like a preamplifier, was not expected to have a low range, and I thought it would be a head deck if it was a more light sound on the middle and high bounds, but I did not feel a shortage in the low range as told. Sharp and sharp rise, the sound of the space is clear, the separation of the instrument is good and the air feeling of the site is conveyed. You can feel the flow of air by playing brass instruments, and the depiction of female vocals stretching to high tones is vivid. There is no sense of loss of sound by narrowing the volume. If you don't have enough bass bass, I think you need enough bass.