our most powerful hybrid & solid-state amplifier


Model M2.2 is the most powerful amplifier in the line of LAMM hybrid and solid-state audio equipment. It is one of the best creations of its designer’s professional career – a result of years of intensive research directed at attaining the most accurate reproduction of recorded music.

design elements


The M2.2 is a masterful blend of design and engineering simplicity. It assures the recreation of a three dimensional sound stage in the home, recording studio, etc. without boundaries and limitations. A distinctive feature of the M2.2 is the extraordinary transparency and localization of perceived sound.

It is a pure class A amplifier, with the exception of the output stage which operates in a highly biased A/AB mode. The M2.2 incorporates high-speed MOS-FET transistors in the output stage with no overall feedback. Special switch-selectable biasing circuit maintains the optimal idle current of the output stage for all load conditions between 1-16 Ohms. It is a hybrid design with the one specially selected 6922 vacuum triode.

The M2.2 is conservatively rated to deliver 220 Watts into 8 and 4 Ohms in a highly biased A/AB mode (high and low impedance settings, respectively); 440 Watts into 2 Ohms, and 600 Watts into 1 Ohm (low impedance setting), continuous. The M2.2 can drive any known speaker. The harmonic structure remains intact regardless of the speaker load, while the extreme clarity is maintained at all power levels.

components


Each amplifier is carefully constructed and hand-crafted with the finest materials and parts currently available, some of which include military graded low noise DALE metal film resistors; PRC wire wound resistors; ELECTROCUBE and ROEDERSTEIN film capacitors; high frequency switching grade CORNELL DUBILIER electrolytic capacitors; BOURNS multi-turn potentiometers; HAMMOND filter chokes; military graded low noise long life vacuum tubes; high quality heavy duty gold-plated binding posts and RCA jacks; gold-plated NEUTRIC XLR connectors, and CAMAC-type coaxial connectors from FISCHER.

Special attention was given to designing the toroidal power transformer, which has no mechanical contact with either the transformer cover or the chassis and is suspended in a special encapsulant that almost completely absorbs even the residual mechanical vibrations. This plays a significant role in assuring the absolutely unique clarity and micro-resolution during sound reproduction.

The M2.2 works on all world AC line voltages. U.S. Patent No. D368,261; U.S. Patent No. 5,470,795; other patents pending.

Gallery


audio critic reviews


Jay Fisher, The Robb Report (June 2005)

…Created by the innovative engineer and psychoacoustics researcher Vladimir Lamm, the M2.2 is a no-compromise hybrid vacuum tube/solid-state design that employs the 6922 vacuum triode in the second stage and 12 high-speed MOS-FET output transistors. …As Lamm states in his product description, “the M2.2 can drive any known speaker.”

…The M2.2’s scientific instrument styling belies its ability to bring astonishing life to recorded music. This is an honest amp that sounds like neither a solid-state nor a tube amplifier. In fact, it doesn’t “sound” like anything except the music. …Music emanates from the blackest background with shadings and nuances previously missed by other amplifiers. The sonic difference between most state-of-the-art amplifiers and the Lamm M2.2 is like comparing a marvelous bottle of wine to a benchmark bottle. The contrast is subtle but important.

The M2.2 reproduces music with the highest degree of resolution, exquisitely nuanced spatial layering, the trueness of instrumental timbre. Through the most extreme dynamic ranges, from the quiet shuffling of feet backstage to violently explosive orchestral crescendos, recordings are delivered so accurately and effortlessly that the listener is afforded the opportunity to forget about everything but the music.

Paul Bolin, Stereophile (March 2005)

…The Lamm M2.2 represented a small but, at these levels of performance, significant advance in virtually every aspect of sonic performance over the M2.1, at least as I remember the earlier amplifier.

…The M2.2 sounded nearly identical to the M1.2 Reference about 90% of the time, which is not surprising — the amps’ circuits are essentially identical, and the upgrades from .1 to .2 status are the same in both amps. It was the 10% of the time that I heard differences that showed how small variations can matter.

…The M2.2 and the M1.2 Reference both sound marvelously true to life, both run hot, and both are superbly built yet easy to manage and live with. [However]…some speakers need the sheer might offered by the M2.2. If you have big planars or are playing big box speakers of only moderate efficiency in a large room, twice the power shoul definitely factor into your considerations. The extra whomp that the M2.2 offers will be necessary in a lot of systems. Not that you’ll give up very much if you choose the M1.2 Reference, or will even give it up very often — there’s no such thing as a “second best” from Lamm. This is a no-lose choice.

John Johnson, Secrets of Home Theater and High Fidelity (May 2006)

..I don’t know if the Lamm M2.2 is the best power amplifier in the world, because I have not heard all the power amplifiers out there. But, I can say that it is one of the best audio products I have ever heard, period. It is priced like a Maserati, has conservative looks as does a Maserati, and performs at a level like a Maserati. I simply can’t imagine anything sounding better than this.

Measurement


The following data represents the M2.2 as performed by an independent party:
Mr. Bascom H. King of BHK Laboratory (bhk@rain.org).

Rated Output Power
HIGH  IMPEDANCE SETTING
minimum continuous sine-wave power, from 20Hz-20KHz with no more than:
0.3% THD (FTC) @ rated line voltage > 220 Watts into 8 Ohms (41 Watts Class A operation).
0.3% THD (FTC) @ rated line voltage > 440 Watts into 4 Ohms (20.5 Watts Class A operation).
0.5% THD (FTC) @ rated line voltage > 700 Watts into 2 Ohms (10.25 Watts Class A operation).
1% THD (FTC) @ rated line voltage > 900 Watts into 1 Ohm (5.125 Watts Class A operation).
LOW  IMPEDANCE SETTING
minimum continuous sine-wave power, from 20Hz-20KHz with no more than:
0.3% THD (FTC) @ rated line voltage: 220 Watts into 4 Ohms (41 Watts Class A operation).
0.5% THD (FTC) @ rated line voltage: 440 Watts into 2 Ohms (20.5 Watts Class A operation).
1% THD (FTC) @ rated line voltage: 600 Watts into 1 Ohm (10.25 Watts Class A operation).
Rated Output Power
HIGH  IMPEDANCE SETTING
With continuous sine waves from 20Hz-20KHz @ rated line voltage:
59.33 Volts peak into 8 Ohms, corresponding to 440 Watts peak.
59.33 Volts peak into 8 Ohms, corresponding to 440 Watts peak.
52.92 Volts peak into 2 Ohms, corresponding to 1,400 Watts peak.
42.43 Volts peak into 1 Ohm, corresponding to 1,800 Watts peak.
LOW  IMPEDANCE SETTING
with continuous sine waves from 20Hz-20KHz @ rated line voltage:
41.96 Volts peak into 4 Ohms, corresponding to 440 Watts peak.
41.96 Volts peak into 2 Ohms, corresponding to 880 Watts peak.
40 Volts peak into 1 Ohm, corresponding to 1,600 Watts peak.
Rated Output Power
HIGH  IMPEDANCE SETTING
with continuous sine waves from 20Hz-20KHz @ rated line voltage:
7.42 Amps peak into 8 Ohms, corresponding to 440 Watts peak.
14.84 Amps peak into 4 Ohms, corresponding to 880 Watts peak.
26.46 Amps peak into 2 Ohms, corresponding to 1,400 Watts peak.
42.43 Amps peak into 1 Ohm, corresponding to 1,800 Watts peak.
LOW  IMPEDANCE SETTING
with continuous sine waves from 20Hz-20KHz @ rated line voltage:
10.49 Amps peak into 4 Ohms, corresponding to 440 Watts peak.
20.98 Amps peak into 2 Ohms, corresponding to 880 Watts peak.
40 Amps peak into 1 Ohm, corresponding to 1,200 Watts peak.
Maximum (clipping) Output Power
HIGH  IMPEDANCE SETTING
Continuous 1 KHz sine-wave power with no more than:
1% THD (FTC) @ rated line voltage: 280 Watts into 8 Ohms.
1% THD (FTC) @ rated line voltage: 480 Watts into 4 Ohms.
1% THD (FTC) @ rated line voltage: 780 Watts into 2 Ohms.
1% THD (FTC) @ rated line voltage: 1,000 Watts into 1 Ohm.
LOW  IMPEDANCE SETTING
Continuous 1 KHz sine-wave power with no more than:
1% THD (FTC) @ rated line voltage: 300 Watts into 4 Ohms.
1% THD (FTC) @ rated line voltage: 500 Watts into 2 Ohms.
1% THD (FTC) @ rated line voltage: 780 Watts into 1 Ohm.
Maximum (clipping) Output Voltage
HIGH  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
66.93 Volts peak into 8 Ohms, corresponding to 560 Watts
61.97 Volts peak into 4 Ohms, corresponding to 960 Watts peak.
55.86 Volts peak into 2 Ohms, corresponding to 1,560 Watts peak.
44.72 Volts peak into 1 Ohm, corresponding to 2,000 Watts peak.
LOW  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
49 Volts peak into 4 Ohms, corresponding to 600 Watts peak.
44.72 Volts peak into 2 Ohms, corresponding to 1,000 Watts peak.
39.5 Volts peak into 1 Ohm, corresponding to 1,560 Watts peak.
Maximum (clipping) Output Current
HIGH  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
8.37 Amps peak into 8 Ohms, corresponding to 560 Watts peak.
15.5 Amps peak into 4 Ohms, corresponding to 960 Watts peak.
27.93 Amps peak into 2 Ohms, corresponding to 1,560 Watts peak.
44.72 Amps peak into 1 Ohm, corresponding to 2,000 Watts peak.
LOW  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
12.25 Amps peak into 4 Ohms, corresponding to 600 Watts peak.
22.36 Amps peak into 2 Ohms, corresponding to 1,000 Watts peak.
39.5 Amps peak into 1 Ohm, corresponding to 1,560 Watts peak.
Small Signal Frequency Response
HIGH  IMPEDANCE SETTING
At 1 Watt into 8 Ohms @ rated line voltage: (+0; -3dB) 4 Hz – 155 KHz.
LOW  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
at 1 Watt into 4 Ohms @ rated line voltage: (+0; -3dB) 4 Hz – 155 KHz.
Frequency Response
HIGH  IMPEDANCE SETTING
At 220 Watt into 8 Ohms @ rated line voltage: (+0; -3dB) 4 Hz – 155 KHz.
LOW  IMPEDANCE SETTING
With continuous 1 KHz sine wave @ rated line voltage:
at 220 Watt into 4 Ohms @ rated line voltage: (+0; -3dB) 4 Hz – 155 KHz.
Slew Rate
Vout = 118.66 Volts peak-to-peak of square-wave signal into 8 Ohms F=10KHz @ rated line voltage: 42 Volts per microsecond
Rise Time
Vout = 118.66 Volts peak-to-peak of square-wave signal into 8 Ohms F=10KHz @ rated line voltage: 2.2 microseconds
Noise
Signal/Noise ratio ref. 2.83 Volts RMS into 8 Ohms (1 W): 22 Hz – 22 KHz: typically 72.5 dB | A weighted: typically 78.2 dB
Signal/Noise ratio ref. 41.95 Volts RMS into 8 Ohms (110 W): 22 Hz – 22 KHz: typically 96 dB | A weighted: typically 101.5 dB
IM Distortion
HIGH  IMPEDANCE SETTING
(60Hz:7KHz 4:1) SMPTE:
from 0.1-220 Watts into 8 Ohms @ rated line voltage: no more than 1%
from 0.1-440 Watts into 4 Ohms @ rated line voltage: no more than 1%
from 0.1-700 Watts into 2 Ohms @ rated line voltage: no more than 1%
from 0.1-900 Watts into 1 Ohm @ rated line voltage: no more than 1%
LOW  IMPEDANCE SETTING
(60Hz:7KHz 4:1) SMPTE:
from 0.1-220 Watts into 4 Ohms @ rated line voltage: no more than 1%
from 0.1-440 Watts into 2 Ohms @ rated line voltage: no more than 1%
from 0.1-600 Watts into 1 Ohm @ rated line voltage: no more than 1%
Voltage Gain
Voltage Gain: 39 ± 2% or 31.8 ± 0.2dB.
Inputs
BALANCED 3-pin gold-plated XLR connector. Pin assignment:
pin 1 = signal ground;
pin 2 = non-inverting input (+);
pin 3 = inverting input (-).
NON-INVERTING:
brass gold plated single-ended RCA connector (connected in parallel with pin 2 of XLR connector).
INVERTING:
brass gold plated single-ended RCA connector (connected in parallel with pin 3 of XLR connector).
Input Sensitivity
HIGH  IMPEDANCE SETTING
1.076 Volts RMS ± 2% for 220 Watts into 8 Ohms.
LOW  IMPEDANCE SETTING
0.761 Volts RMS ± 2% for 220 Watts into 4 Ohms.
0.761 Volts RMS ± 2% for 220 Watts into 2 Ohms.
0.628 Volts RMS ± 2% for 600 Watts into 1 Ohm.
Input Impedance
41 KOhms shunted by 470pF.
Outputs
Two sets of brass gold plated binding posts.
Output Impedance
At 1 KHz: typically 0.098 Ohm. From 20 Hz – 20 KHz: typically 0.098 ± 0.007 Ohm.
Damping Factor
at 1 KHz: typically 82 re: 8 Ohm. From 20 Hz – 20 KHz: typically 82 ± 8 re: 8 Ohm.
Operating Temperature
Operating Temperature: -4 to +104 degrees Fahrenheit (-20 to +40 degrees Celsius) ambient.
Grounding
Grounding: Separated ground and earth. Floating chassis connected to mains earthing.
Power Supply
Nominal line voltage: 100-240 Volts 50/60Hz. Input voltage range: ±10%.
Two power transformers two filter chokes eight separate power supplies.
AC voltage intensively filtered by special RFI power line filter.
Power Supply Energy Storage
Power Supply Energy Storage: Approximately 250 joules.
Front Panel Controls
Front Panel Controls:
LED control.
Rear Panel Connectors and Controls
Rear Panel Connectors and Controls:
POWER SWITCH.
LOAD SWITCH.
AC POWER INLET.
AC MAINS FUSE along with the corresponding fuse holder.
One input XLR connector gold-plated.
Two input RCA connectors gold-plated.
Two sets of gold-plated SPEAKER BINDING POSTS.
Two DC power jacks (central pin 2mm dia.) for connecting remote link cables.
EARTHING (GROUNDING) post gold-plated.
Features
AC voltage selector: 100/120/220/230/240 Volts internally switchable.
Transformer hum reducer: Special circuit reduces power transformer core saturation and residual mechanical hum.
Ultra low-noise power transformer: Custom-made toroidal power transformer has no mechanical contact with either the transformer cover or the chassis as transformer is suspended in a special encapsulant that almost completely absorbs even the residual mechanical vibrations. This plays a significant role in assuring the absolutely unique clarity and micro-resolution during sound reproduction.
Bias setting (load) switch: Switch-selectable biasing circuit maintains pure Class A operation of the output stage for all load conditions between 4-16 Ohms.
Remote control: Power on/off. Available remote link cable coordinates the remote functions of two or more amplifiers.
Safety/Protection: “Soft-start” circuit protects power supply components from large in-rush currents when the amplifier is turned on.
Protection against possible damages from high voltage transients on AC power line.
Thermal resetting fuse connected in series with AC mains fuse controls heat-sink temperature.
Threshold: 176 degrees Fahrenheit (80 degrees Celsius).
Thermal resetting fuse controls internal temperature of the power transformer.
Threshold: 248 degrees Fahrenheit (120 degrees Celsius).
Unique electronic protection circuit guards against accidental abuse (e.g. overload shorts across the output excessive DC at the input or output etc.).
AC voltage fuses:
8 Amps slo-blo for 100/120 Volts (4 Amps slo-blo for 220/230/240 Volts);
0.125 Amps slo-blo for 100/120/220/230/240 Volts internally mounted.
General
POWER CONSUMPTION
Nominal: Typically 280 Watts @ rated output @ 8(4) Ohms (class A operation) and at idle.
Maximum: Typically 1000 Watts @ rated output @ 1 Ohm (low impedance setting).
Burn-in Time at Factory: Minimum 72 hours.
Recommended Burn-in Time in End-user’s System: Minimum 200 hours.
Warm-up time: Minimum 35 minutes.
DIMENSIONS
8.25″(21cm) H x 17″(43.2cm) W x 19.5″(49.5cm) D
[add 2.8125″(7.14cm) of depth for front and rear handles].
Unit weight: 71 Lbs (32.2 Kg).
Shipping weight: 97.4 Lbs (44.2 Kg).
Tube Complement: V101 – 6922 (second amplification stage)