Bowedtoothdoc
100+ Head-Fier
- Joined
- Dec 14, 2009
- Posts
- 118
- Likes
- 0
From the Little Dot Website:
Little Dot Amplifiers • View topic - Little Dot MK VII+ Balanced Headphone Amplifier
The Little Dot MK VII+ is a fully balanced, dual-mono headphone amplifier with single-ended compatibility. The circuit is composed of four independent channels with LME49710HA pre-stage and discrete BD139/BD140 transistor output stage. The four independent channels are fed by dual double-wound toroidal transformers with double rectification and four independent regulators which constitute a true “dual-mono” architecture.
The input and output XLR jacks are Swiss-made locking Neutrik for superior conductivity and durability. The input RCA jacks are premium American CMC and the 6.35mm output headphone port is also a locking Neutrik jack. The volume control is a Japanese ALPS potentiometer for exceptional tracking and smooth rotation. Premium hand-selected resistors are used throughout the circuit alongside German WIMA / CHEMI-COM capacitors. The Little Dot MK VII+ is an OCL (output capacitor-less) design which provides an unmatched level of sound purity as components in the signal path are minimized to reduce distortion and imparting color to the sound. Extremely low output impedance and high damping factor coupled with immense power output ensures iron control of any headphone driver. The Little Dot MK VII+ delivers an unmatched level of transparency with unbound dynamic range, lightening quick transient response, and thunderous low frequency impact.
Technical Specifications:
Inputs:
Balanced: 2x 3-Pin XLR
Single-ended: 2x RCA
Outputs:
Balanced: 4-Pin XLR
Single-ended: 1/4" (6.35mm) TRS Stereo jack
Frequency Response: 5 Hz - 200 Khz (- 1dB)
THD+N: 0.001% (2 V RMS @ 1000 KHz)
Recommended Headphone Impedance: 8 - 600 ohms
Input Impedance: 20K ohms
THD+N: 0.01% (5V RMS @ 1000 Hz)
Signal-to-Noise: 98 dB
User Selectabale Gain Settings: Low (2.5x) and High (5x)
Power Output:
1500 mW into 8 ohms
1000 mW into 32 ohms
500 mW into 120 ohms
300 mW into 300 ohms
Power Consumption: 25 VA
Measurements:
Metric: 275mm (length) by 217mm (width) by 61mm (height)
Imperial: 10.83 inches (length) by 8.54 inches (width) by 2.4 inches (height)
Weight: 3.5 kg or 7.71 lbs
Available in either 110-120VAC or 220-240VAC
One Year Official Little Dot Warranty
Looks like they did away with the opamps in the buffer stage in favor of discrete transistors.
Anyone with some technical knowlege have any idea as to if this is an improvement over the original design?
Little Dot Amplifiers • View topic - Little Dot MK VII+ Balanced Headphone Amplifier
The Little Dot MK VII+ is a fully balanced, dual-mono headphone amplifier with single-ended compatibility. The circuit is composed of four independent channels with LME49710HA pre-stage and discrete BD139/BD140 transistor output stage. The four independent channels are fed by dual double-wound toroidal transformers with double rectification and four independent regulators which constitute a true “dual-mono” architecture.
The input and output XLR jacks are Swiss-made locking Neutrik for superior conductivity and durability. The input RCA jacks are premium American CMC and the 6.35mm output headphone port is also a locking Neutrik jack. The volume control is a Japanese ALPS potentiometer for exceptional tracking and smooth rotation. Premium hand-selected resistors are used throughout the circuit alongside German WIMA / CHEMI-COM capacitors. The Little Dot MK VII+ is an OCL (output capacitor-less) design which provides an unmatched level of sound purity as components in the signal path are minimized to reduce distortion and imparting color to the sound. Extremely low output impedance and high damping factor coupled with immense power output ensures iron control of any headphone driver. The Little Dot MK VII+ delivers an unmatched level of transparency with unbound dynamic range, lightening quick transient response, and thunderous low frequency impact.
Technical Specifications:
Inputs:
Balanced: 2x 3-Pin XLR
Single-ended: 2x RCA
Outputs:
Balanced: 4-Pin XLR
Single-ended: 1/4" (6.35mm) TRS Stereo jack
Frequency Response: 5 Hz - 200 Khz (- 1dB)
THD+N: 0.001% (2 V RMS @ 1000 KHz)
Recommended Headphone Impedance: 8 - 600 ohms
Input Impedance: 20K ohms
THD+N: 0.01% (5V RMS @ 1000 Hz)
Signal-to-Noise: 98 dB
User Selectabale Gain Settings: Low (2.5x) and High (5x)
Power Output:
1500 mW into 8 ohms
1000 mW into 32 ohms
500 mW into 120 ohms
300 mW into 300 ohms
Power Consumption: 25 VA
Measurements:
Metric: 275mm (length) by 217mm (width) by 61mm (height)
Imperial: 10.83 inches (length) by 8.54 inches (width) by 2.4 inches (height)
Weight: 3.5 kg or 7.71 lbs
Available in either 110-120VAC or 220-240VAC
One Year Official Little Dot Warranty
Looks like they did away with the opamps in the buffer stage in favor of discrete transistors.
Anyone with some technical knowlege have any idea as to if this is an improvement over the original design?