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Mods for the ACM-2

  • Open Plan RecordingOpen Plan Recording
    Mark Chierego’s mod features a single layer headbasket, point to point solid core wiring, Australian made ribbons (1.8 micron 99.9% pure aluminium), matched with either a Samar Audio Design toroidal transformers or the Lundahl 2912.

TNC Audio ACM-2

Pricing & Availability

  • MSRP: n/a

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BidirectionalTNC Audio ACM-2

Bidirectional Ribbon Microphone

The ACM-2 is a passive ribbon microphone with a 45mm aluminum ribbon. It appears to be another ShuaiYin SYR-30 clone, and is most likely identical to the t.bone RM700 and Nady RSM-4.

The large headbasket measures 3'' in diameter. The body diameter is ~7/8'' (22mm).

TnC Audio ACM-2 MicrophoneThere is no circuit board or chassis under the body. The three screws nearest the head detach the capsule assembly and reveal the transformer; the bottom set of screws hold the XLR jack in place.

TnC Audio ACM-2 MicrophoneThe front and back grilles are flat, rather than bowed (as in some SYR-30 derivatives).

Three layers of screening protect the ribbon element from blasts: the heavy outer grille (visible in the photos), a medium gauge layer of metal mesh just under the outer grille, and a layer of fine mesh mounted to the ribbon motor, covering just the ribbon.

The ACM-2 ships in a padded wooden storage case with a plastic mic clip.

The TNC Audio ACM-2 is also known as: ACM2.

The mic was released in 2008.

Specifications

Pickup Patterns Pads & Filters
Bidirectional (2.2 mV/Pa; 40 - 18,000 Hz)
Ribbon Construction Impedance SPL/Noise
2-micron, 600 Ohms (Low) Max SPL: 148 dB
Weight Length Max Diameter Interface(s)
320g (11.29oz) 165mm (6.50'') n/a
  • 3-pin XLR male (1)
Power Specifications

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