Forget about sp 1000 amp/sp1000m. Get
Mass Kobo 424/428. This will add a new dimension to sp 1000. This japanese custom made amp has left me startled. Its like i am listening to a new player with a beefy amp. The 3.5mm grounding connection has improved the SQ to a great extent. I have set line out to 1.25v on sp1k. It has adjustable output gain-changing switch for dynamic/planar hp & highly sensitive BA. Drives my lcd i4 with authority. The dynamics & transparency are insane with pitch black background and fast transients. Throw any type of music at it. It excels in all departments imho. Just completed 7 hour long session. Mind Blowing !
The custom cable is made of 10 silver OFC wires; 8 for balanced(2.5mm) & 2 for earth(3.5mm) to pentaconn(4.4mm) connector. Running on 4 Panasonic Eneloop Pro rechargeable batteries (Japan Import).
Highly recommended. Best portable solution imho.
Thank you
@Zhanming057.
SP 1K CU + Mass Kobo 424 + Double Helix Cables ultrashort adapter male XLR to 2.5mm + Audeze Lcd i4 (balanced EA Horus). Output set to 0.7v in this pic. At 1.25v the volume pot remains from 7-8 o'clock.
Adjustable output gain-changing switch
<Specifications> (Batt. 6V or USB 5V)
Model: Full-Balanced Portable Stereo headphone amplifier
Input: φ4.4 TRRS x 1 (balanced or unbalanced)
Output: model424 XLR-4Pin model428 4.4 TRRS (balanced) , φ3.5 TRS (unbalanced)
Maximum Input Level: +16dBm (balanced), +10dBm (unbalanced)
Maximum Output Level (P-P): 7 V (balanced), 3.5V (unbalanced) (with 32Ω loaded, 1kHz, THD+N 0.5%)
(RMS): 2.3V (balanced) , 1.2 V (unbalanced) (with 32Ω loaded, 1kHz, THD+N 0.5%)
Maximum Output without Distortion: 165mW (balanced), 45mW (unbalanced) (with 32Ω load, 1kHz, THD+N 0.5%)
Frequency Characteristics: 20Hz - 20kHz (-1dB)
Noise Level: Less than 40μV (in the minimum volume position, 32Ω loaded) Less than 150μV (in the maximum volume position, 32Ω loaded)
Power Supply: AA Alkaline or rechargeable battery x 4
External Power Supply: Micro USB +5v
Consumption Current: 0.19A (battery 6V, No signal) 0.21A (rechargeable battery, 4.8V No signal) 0.21A (USB 5V, No signal)
0.28A (battery 6V, 1/8 Output) 0.32 A(rechargeable battery, 4.8V, 1/8 output) 0.31A(USB 5V, 1/8 Output)
0.49A (battery 6V, Maximum Output) 0.61A (rechargeable battery), 4.8V, Maximum Output) 0.58A (USB 5V, Maximum Output)
Size: 97mmW x 132mmD x 40mmH (not include protrusions)
Weight: model424 445g (with batteries), 387g (without batteries)
model428 440g (with batteries), 382g (without batteries)