Atma-Sphere Mk3.1 lineup from EnjoytheMusic.com

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From EnjoytheMusic.com

Atma-Sphere, a multi-award winning manufacturer of tune amplification products, has announced their Mk3.1 lineup. The Mk3.1 represents a dramatic reduction of full-power distortion due to circuit revisions in the voltage amplifier, as Atma-Sphere amplifiers have only one gain stage in the entire amplifier regardless of model. This reduced distortion translates to smoother sounding while at the same time enhances transparency, provides more detailed and produces a wider bandwidth. There have been other revisions as well, as the M-60 now has a more robust chassis construction. The S-30, M-60 and MA-1 now have panel color options for the meter panel. Meanwhile the MA-2 now has a revised appearance more in keeping with the other amplifiers in the line, with a completely new power transformer set. The S-30 is now available in two versions, which includes the standard type and a low-gain version designed especially for high efficiency loudspeakers where excess amplifier gain is always an issue. Below are the specifics:

S-30 Mk.III ($3890)
* 30 watts/ch into 8-Ohm load/45 watts into 16-Ohm load
* Power bandwidth: 2Hz to 75kHz within 1/2dB
* Frequency response (1 watt): 1 Hz-100 KHz within 3 dB
* THD typically 1% at full power
* IM distortion typically under .04% at full power
* Phase shift: less than 1 degree @ 20KHz
* Input impedance: 100K single-ended, 200K balanced
* Output section risetime: 600V/micro-sec.
* Stability: stable with all loads and inputs
* Feedback: 2dB
* Power consumption: 400 watts
* Tube complement: Ten 6AS7G output tube and six 6SN7 driver tube
* Dimensions: 13" L x 17" W x 8" H

M-60 Mk. III ($6800 per pair)
* 60 watts/channel into 8 Ohm load/ 45 watts/ch. into 4 Ohms/ 80 watts/ch. into 16 Ohms
* Power bandwidth: 2 Hz - 75 kHz within 1/2 dB
* Input impedance: 100Kohm single-ended, 200Kohm balanced
* Input voltage for full output: 2.83V
* Frequency response (1 watt): 1 Hz - 100 kHz within 3 dB
* Intermodulation Distortion: .05% @ full power
* THD: typically under .5% with proper setup.
* 20 Hz square wave tilt: unmeasurable
* Phase shift: less than 1 degree @ 20 kHz
* Power supply storage: 140 Joules/chassis
* Input impedance: 100K single-ended, 200K balanced
* Output section risetime: 600 V/micro-second
* Output Impedance: ~4.1 Ohms
* Feedback: 1 dB
* Power consumption: 300 watts/chassis
* Tube complement: Eight 6AS7/channel and four 6SN7s
* Weight: 30 lbs./chassis
* Dimensions: 17" wide x 13" deep x 8" high

MA-1 MkIII ($15,900 per pair)
* 140 watts/channel into 8 Ohm load/135 watts into 4 Ohm load
* Power bandwidth: 2 Hz - 100 kHz within 1/2 dB
* Frequency response (1 watt): 1 Hz - 200 kHz within 1/2 db
* IM distortion: less than .05% at full power
* THD: nominally less than 0.5%
* 20 Hz Square Wave Tilt: unmeasurable
* Phase shift: less than 1 degree @ 20 kHz
* Power supply storage: 600 Joules/chassis
* Input impedance: 100K single-ended, 200K balanced
* Output section risetime: 600V/micro-second
* Output Impedance ~2.3 Ohms (power method standard measurement)
* Power consumption: 500 watts/chassis
* Tube complement: 14 6AS7s and 5 6SN7s per channel
* Weight: 36 lbs./chassis
* Dimensions 18" L x 17" W x 8.5" H

MA-2 Mk. III ($36,500 per pair)
* 220 watts/channel into 4, 8 or 16 Ohm load
* Power bandwidth: 2 Hz - 85 kHz within 1/2 db (open loop)
* Frequency response (1 watt, open loop): l Hz - 100 kHz within 3 dB
* IM Distortion: less than .05% at full power
* THD: less than 0.5%
* Square Wave Tilt: unmeasurable
* Phase shift: less than 1 degree @ 20 kHz
* Power supply current: 80 Amps
* Input impedance: 100K single-ended, 200K balanced- selectable to 600 ohms
* Output section risetime: 600 V/micro-second
* Output Impedance: ~1.75 Ohms (open loop)
* Power Supply Storage: 1200 Joules in output section, 100 Joules in Driver supply.
* Power consumption: 800 watts/chassis
* Tube complement: 20 6AS7 output tubes and 6 6SN7 driver tubes.
* Dimensions: 28" L x 17" W x 10" H
* Weight: 103 lbs./chassis

More specifications from their entire line is available from their website. Enjoy the Music.com has reviewed the Atma-Sphere MP-3 by Todd Warnke (click here), the MP-3 as review by Wayne Donnelly (click here) and the Atma-Sphere M-60 Mk.II.2 OTL monoblock amplifiers (click here).