CEC HD53

Commentary

Headphone amplifier equipped with CEC's unique LEF (Load Effect Free) circuit.

The HD53 is equipped with two separate headphone amplifiers, each of which is designed to be volume adjustable.
Also, although it is a headphone amplifier, it can be connected to a speaker.

The CEC-specific LEF (Load Effect Free) circuit is incorporated in the circuit system to realize a signal circuit without negative feedback. Also, when using headphones, the LEF circuit is used as a pure A-class operation. This LEF circuit realizes high efficiency as well as a glossy and delicate playback sound.
Supports a wide range of impedance.

The volume circuit uses the newly developed Intelligent Gain Management (IGM), which controls the volume by controlling the gain itself without using a mechanical volume resistor, attenuator or CMOS-type volume.
This provides perfect channel balance, high accuracy, and permanence with no change over time.

The input terminal is equipped with an XLR terminal in addition to the normal RCA terminal, and can be connected to devices with balanced output.

The headphone output is compatible with 3.5 mm and 6.3 mm, and up to 2 units can be connected at the same time.
The speaker output terminal uses a spring type that is easy to put on and take off and does not loosen easily.

Model Rating

Type	Headphone amplifier
Frequency characteristic	Headphones : 20 Hz to 20 kHz Speaker : 5 Hz to 200 kHz
Total harmonic distortion factor	0.01%
Signal-to-noise ratio	Headphones : 100 dB Speaker : 95 dB
Rated output	Headphones : 70 mW (32 Ω) Speaker : 7W (8 Ω)
Load impedance	Headphones : 32 Ω ~ 2k Ω Speaker : 4 Ω ~ 8 Ω
Input terminal	1 system (XLR balanced 1 system, RCA unbalanced 1 system)
Output terminal	Headphone : 2 types (2 x 6.3mm/3.5 mm) Speaker output : 1 system
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	15W minimum 50W max.
External dimensions	Width 217.5x Height 51x Depth 301 mm (including terminal and leg)
Weight	2.6kg
Attachment	AC cord RCA-Mini Plug Conversion Code