Category	Specification
Type	8‑channel headphone mixing/distribution amplifier (1 U rack)
Amplifier Channels	8 independent high‑power stereo amplifiers, each with level control and LED meter
Main Inputs	2 × stereo (Main In 1 & 2), ¼″ TRS, servo-balanced
Main Input Impedance	Balanced: 40 kΩ; Unbalanced: 20 kΩ
Max Main Input Level	+16 dBu (some sources list +22 dBu)
Direct Inputs	8 × independent ¼″ TRS (one per channel)
Direct Input Impedance	~15 kΩ
Phone Outputs	16 × ¼″ TRS (8 front, 8 rear), dual per channel
Max Output Level	+24 dBm into 100 Ω, +19 dBm into 8 Ω
Minimum Load Impedance	8 Ω
Frequency Response	10 Hz – 150 kHz, ±3 dB
Dynamic Range	~101–103 dB (22 Hz–22 kHz)
Signal‑to‑Noise Ratio	> 87 dB or > 90 dB depending on spec
THD + N	~0.006–0.007 % @ +4 dBu, 1 kHz
Controls (per channel)	Output level knob, Main In 1/2 select, Mono/Stereo switch, 8-digit LED meter
Master Controls	Two Main Input level dials, 5-segment Input LED meter
Power Supply	“Planet Earth” switching supply (100–240 V AC autorange), draws ~35 W
Dimensions (H×W×D)	44 × 483 × 149 mm (1.75″ × 19″ × 5.9″)
Weight	~1.9 kg (4.2 lb)
Warranty	3 years (varies by region)

Category	Specification
Model Name	HPM1000
Style	Over-Ear
Type	Wired Headphones
Connectivity Technology	Wired
Connector Type	3.5 mm Jack
Included Components	1× Headphone
Control Type	Volume Control
Cable Feature	Tangle-Free
Compatible Devices	Desktops, Laptops, Tablets, Cellphones, Car Audio Systems
Hardware Platform	Laptop, Smartphone
Age Range (Description)	Adult
Material	Others (not specifically stated)
Size	HPM1000: Multi-Purpose Headphones
Product Dimensions	19.51 × 16 × 9.19 cm
Item Weight	~200 g (199.58 g)
Package Type	Standard Packaging
Net Quantity	1 Unit
Item Model Number	HPM1000
Manufacturer	Music Group Commercial BM Ltd.
Country of Origin	China

Category	Specification
Type	Closed-back, over-ear (circumaural), wired headphones
Driver Size	40 mm cobalt drivers
Frequency Response	20 Hz – 20 kHz
Impedance	64 Ohms
Sensitivity	110 dB SPL @ 1 kHz
Maximum Power Handling	100 mW
Maximum SPL	110 dB
Cable Type	Single-sided, oxygen-free copper cable
Cable Length	2.0 meters (6.6 feet)
Connector	3.5 mm TRS with 6.3 mm (1/4”) adapter included
Ear Cup Design	Oval-shaped, closed-back
Headband	Padded, adjustable
Build Material	Rugged construction
Weight	Approx. 310 g (0.7 lbs)
Use Case	Studio monitoring, DJing, general listening
Warranty	3 years (manufacturer warranty)

Category	Specification
Type	4-Channel Stereo Headphone Amplifier
Input	1 × ¼″ TRS stereo jack
Input Impedance	100 kΩ
Max Input Level	+15 dBu
Outputs	4 × ¼″ TRS headphone jacks
Output Impedance	~80 Ω
Output Power	~40 mW per channel into 100 Ω
Frequency Response	20 Hz – 20 kHz
THD (Total Harmonic Distortion)	< 0.005%
SNR (Signal-to-Noise Ratio)	> 90 dB
Amplifier Type	4580 operational amplifiers (low noise)
Volume Controls	Independent level control for each output
Power Supply	External 12 V DC adapter (150 mA, included)
Power Type	Passive unit (powered only via adapter)
Chassis Material	Metal
Dimensions (W × H × D)	104 × 57 × 47 mm (4.1” × 2.2” × 1.8”)
Weight	~0.37 kg (0.8 lbs)
Warranty	3 Years (Manufacturer Warranty)

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