recordinghacks

TNC Audio ACM-3

Bidirectional Ribbon Microphone

The ACM-3 is a passive ribbon microphone modeled externally after the Royer R-121 (although built with much simpler parts). It is manufactured in China by the Shanghai Silver Flute Sound Company; see their RM3.

Despite the radically different headbasket shapes, the ACM-3 and ACM-2 are the same microphone underneath. Both utilize a 2-micron, 45mm aluminum ribbon suspended between Neodymium magnets.

The headbasket is lined with a very fine-mesh screen. A second layer of blast protection (or third, if you count the slotted case) is mounted to the ribbon motor, as in the ACM-2.

The mic ships in a padded wooden case with a low-quality plastic mic clip that sheds flashing when the mic is inserted.

The TNC Audio ACM-3 is also known as: ACM3.

The mic was released in 2008.

Specifications

Frequency Response - BidirectionalClick Graph to Compare!

Pickup Patterns	Pads & Filters
Bidirectional (2.2 mV/Pa; 30 - 18,000 Hz)

Ribbon Construction	Impedance	SPL/Noise
	200 Ohms (Low)	Max SPL: 137 dB

Weight	Length	Max Diameter	Interface(s)
n/a	159mm (6.26'')	24mm (0.94'')	3-pin XLR male (1)

Power Specifications

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