Lamm Industries L2.1 Reference preamplifier Specifications

Sidebar 1: Specifications

Description: Solid-state line-level preamplifier with separate tubed power supply. Tube complement: one 12AX7/ECC83, one 6C19P, one 5651A, two 12AX3. Inputs: 4 single-ended (RCA). Outputs: 2 single-ended (RCA), 1 balanced (XLR). Input sensitivity: 0.135V RMS, ±2%. Input impedance: 50k ohms. Output impedance: typically 130 ohms. Frequency response: 20Hz–20kHz, ±0.2dB; 5Hz–120kHz, ±3dB. Slew rate: 30V/µs. Risetime: 1µs. THD: <0.03% at 2V RMS. Signal/noise: typically 94dB, 22Hz–22kHz, below 2V RMS output. Power consumption: 80W.
Dimensions: Preamp and power supply (each): 19" (483mm) W by 4.5" (114mm) H by 13.875" (350mm) D. Preamplifier weights: 15.4 lbs (7kg) net, 34.6 lbs (15.7kg) shipping. Power supply weights: 19 lbs (8.6kg) net, 39 lbs (17.7kg) shipping.
Finish: Black
Serial number of unit reviewed: F10186.
Price: $22,790. Approximate number of dealers: 12.
Manufacturer: Lamm Industries, Inc., 2513 E. 21st Street, Brooklyn, NY 11235. Tel: (718) 368-0181. Fax: (718) 368-0140. Web:

Lamm Industries, Inc.
2513 E. 21st Street
Brooklyn, NY 11235
(718) 368-0181

Glotz's picture

Solid state device in the power supply were used? Or is it just less linear? I get the no neg feedback as the higher voltages allowed for greater linearity, but I assume that tubes just do zero feedback designs better?

Really cool product and a very well-conveyed review!

mrkaic's picture

Too inaccurate for a preamp and priced way too high. Compare this to Benchmark's DAC3 and weep.

Hummer189's picture

Hi Art, I know you occasionally use a Croft amplifier, are you aware that Croft has a 2 Box preamp (separate power supply) similar to the Lamm and has been building these for years and as you know Croft uses separate volume controls for each channel. A few similarities which Croft has been doing for years. The 2 box Croft RS preamp is a fraction of the price of the Lamm and I would wager sounds equally as good. Maybe you ought to get to listen to one, if not try the Croft 25R preamp which is all valve regulated and sounds almost as stunning.Would be interesting to know how these compare at different ends of the price spectrum!