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Boxed Weight: 1 Kg
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Product Information
The Solo SRG II headphone amplifier is designed to drive low impedance as well as high impedance headphones.
The Solo SRGII (Studio Reference Green MK II) headphone amplifier puts a real life force behind the music.
The Solo SRG II headphone amplifier combines conventional negative feedback with line driver load sensing to exert greater control over your headphones where it is needed.
It therefore reduces or eliminates altogether the comb-filter effect most headphone impedance curves exhibit in the upper midrange and treble frequencies. It also ensures correct matching with the widest range of headphones and overcomes cable capacitance and inductance problems which could otherwise strip the music of its airy qualities and sound staging. The Solo SRG II headphone amplifier does everything better as well as giving a more weighty bass.
Every Solo is designed to drive low impedance as well as high impedance headphones.
The Solo SRG II headphone amplifier has two line level inputs and a front panel input selector with centre off. It is housed in a strong anodized aluminium eurocard style enclosure. The volume control also acts as sensitivity adjuster and therefore the full rotation can be used (see further explanation below). The Solo SRG II headphone amplifier is suitable for use with headphone impedances from 16 Ohms to 600 Ohms.
Headphone Matching, Suitability and Volume Control Settings
The Solo SRG II is designed to work, and self adjust, on two different input levels (in either switch position): 1] professional (unbalanced) 0dB: 775mV, where its output is to drive 600 Ohm headphones for certain studio applications, and 2] domestic -10dB (DIN): 250mV, where its output is to drive 32 Ohm headphones. In either mode of use it will return virtually identical output power as well as similar sound pressure levels with identical headphone sensitivities.
In typical usage however, it will be used with different headphone impedances in the range 16 - 600 Ohms, having quite different headphone sensitivities (SPL), and input levels between 250mV and 1V. This gives a number of permutations which could not be covered with a gain setting switch, and instead, the Solo SRG II uses a combination of IEC/DIN 61945 headphone amplifier output "matching system" with an accurate Alps volume control which is used over its entire range to accommodate such widely differing conditions of use.
As such the user may find the ideal volume control position required for his/her listening tastes considerably different to that of a hi-fi amplifier. The left-right track matching of the volume control is adjusted by Alps, its manufacturer, for best channel balance between its 9 o'clock and 3 o'clock settings and as such when set for zero volume some residual signal may be heard on one channel and not the other - this is normal and part of the volume control design.
Connection Suggestion
The Solo can be connected in an amplifier tape-loop as shown here.
An extra pair of interconnects are required as well as two phono tee-adapters inserted where indicated by the asterisks shown in the diagram.
When connected as per this suggestion, the input selector on the Solo front panel mimics a tape monitor switch. In position 1, the same source as selected on the amplifier is fed to the Solo; in position 2, the output from the tape recorder (or other recording device) is fed to the Solo.
The Solo SRGII is supplied with the "Green" Plug Top Power Supply at no extra cost, the upgraded PSU 1 is available as an added extra, please select it from the product options dropdown.
Specification
- Headphone impedance range: 16 to 600 Ohms preferred; 8 to 2,000 Ohms acceptable
- Headphone Jack: 1/4 inch (6.35mm) A gauge (BPO B gauge to special order)
- Power output
- (rms, both channels fully driven) 32 Ohms: 27mW/channel; 600 Ohms: 23mW/channel
- Distortion (THD plus noise, ref 1kHz): 0.02%
- Frequency response (-3dB) 32 Ohms load: 27Hz - 35kHz; 600 Ohms load: 10Hz - 39kHz
- Output noise (20Hz-20kHz, CCIR quasi-peak): -84dB
- Input sensitivity (for specified power output) 32 Ohms: 250mV rms; 600 Ohms: 775mV rms
- Channel balance: better than 1dB, "9 to 3 o'clock" positions
- Crosstalk: Left to Right -57dB; Input to Input -68dB
- Mute: Signal off mute, non-shorting
- Output Stage: Bipolar class AB
- Supply voltage: 24V DC
- Size: (approx.) W: 107 x H: 50 x D: 185 (mm) inc. controls
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