CEC HD53R/HD53Rver8.0
HD53R : ¥ 47,250 (tax included, sold in September 2005)
HD53Rver8.0 : ¥ 68,250 (tax included, sold in September 2005)
Commentary
This is a fine-model headphone amplifier with a unique LEF circuit and IGM volume control technology.
It is equipped with two independent headphone amplifiers, each of which is a headphone amplifier with adjustable volume.
By installing a LEF (Load Effect Free) circuit unique to CEC, a signal circuit without negative feedback is established, and both high sound quality and high efficiency are realized.
When using headphones, playback is possible with pure A-class operation.
Although it is a headphone amplifier, it can be connected to a speaker.
A large-capacity 50W toroidal transformer is used for the power supply.
It is compatible with a wide range of impedance (16 Ω ~ 2k Ω), and equipped with a 3-stage (+ 6dB/0dB/-12dB) input sensitivity selector switch on the back, it is also compatible with low-impedance and high-efficiency headphones.
The newly developed Intelligent Gain Management (IGM) is used to minimize loss when adjusting the volume. The volume is adjusted by controlling the gain itself with the front panel knob.
Since the input signal does not pass through a mechanical volume resistor, attenuator or CMOS volume, the S/N ratio and distortion factor are greatly improved.
In addition to the usual RCA (unbalanced type) input terminal, XLR (balanced type) terminal is installed (with input selection switch on the rear panel).
In addition, the headphone output is compatible with 3.5 mm and 6.3 mm, and up to 2 units can be connected simultaneously.
The HD53The-line HD53Rver8.0 with the latest amplifier modules in more selected parts and is upgradeable from the HD53R.
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Model Rating
| Type | Headphone amplifier |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -0.2 dB 10 Hz ~ 200 kHz + 0 -1.4 dB |
| Total harmonic distortion factor | Headphones : 0.009% (32 ω, 1 Vrms input, 0 dBu output) Speaker : 0.09% (8 Ω, 2 vrms input, 1W output) |
| Signal-to-noise ratio | 98 dB (1 Vrms input, 0 dBu output) |
| Rated output | Headphone : 1W (6.5 Vrms, 150 mA) Speaker : 10W + 10W (4 Ω) |
| Load impedance | Headphones : 16 Ω ~ 2k Ω Speaker : 4 Ω ~ 8 Ω |
| Input terminal | 2 systems (XLR balanced type 1 system, RCA unbalanced type 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 |
| External dimensions | Width 218x Height 57x Depth 258 mm (excluding terminals and buttons) |
| Weight | 2.6kg |
| Attachment | AC cord RCA-Mini Plug Conversion Code |
| Remarks | Upgrade from HD53R to Ver. 8.0 (¥ 21,000) |