KENWOOD KA-880D

Commentary

Pre-main amplifier that uses New VIG / DLD circuit and Σ drive circuit.

The New VIG / DLD circuit is a circuit system originally developed by Kenwood, in which a VIG circuit that does not transmit power supply noise components to the power amplifier is installed between the amplifier and the power supply, and the performance of the DLD circuit improves the quality. By this circuit system, ripple, signal components and intermodulation distortion components from the power supply are cut off, and clean energy is supplied to the power amplifier. At the same time, the effect equivalent to that of a huge battery is obtained, and power capacity is increased by a large power supply without ripple.

In the Σ drive, the NF loop is connected to the speaker terminal, so that parts which cause distortion and sound quality degradation are put in the NF loop, and the generation of distortion is suppressed.
In addition, all GND terminals are concentrated at one point on the speaker terminal of the amplifier, mutual interference by ground line pattern and wire material is suppressed, and digital noise generated from peripheral devices is also released to the outside of the amplifier through the ground line.

The EQ amplifier has an ICL high GmFET differential input and IC-based circuit configuration.

The input signal from the CD can be sent directly to the power amplifier by the CD direct circuit and the line straight circuit that passes the tone control.

It is equipped with a dual REC selector that combines the conventional Rec out selector function with the source selector function.
This allows you to record CDs while listening to a tuner, record dubbing on two tapes while listening to CDs, and record the same source simultaneously on Route 3 tapes.

A flexible flat cable is used for wiring from the input pin jack to the input selector.
Since this cable has less inductance, capacitance, and resistance components than conventional cables, it can reduce electromagnetic coupling between an output circuit for handling large signals and an input circuit for handling small levels, and realizes low distortion.
Also, since the spacing between the wires is fixed, there is less interference between the left and right channels and between input positions, and less wire routing, resulting in improved channel separation and crosstalk.

Model Rating

Type	Integrated amplifier
Rated Output (20 Hz to 20 kHz, Both Channel Operation)	120W + 120W (6 Ω, THD 0.009%) 100W + 100W (8 Ω, THD 0.006%)
Dynamic Power	260W (2 Ω) 235W (4 Ω) 165W (8 Ω)
Total Harmonic Distortion Factor (CD)	0.001% (at rated output, 1 kHz, 8 Ω) 0.006% (Rated Output, 20 Hz to 20 kHz, 8 Ω)
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1)	0.006% (8 Ω at rated output)
Frequency Response (Line → Speaker)	5 Hz ~ 80 kHz + 0 -3dB
Damping factor	1000(50Hz)
Input Sensitivity / Impedance	Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω DAT, CD, Tuner, Aux, Tape : 150mV/47k Ω
SN ratio (input short / EIAJ)	Phono MM:86dB/79dB Phono MC:68dB/75dB DAT, CD, Tuner, Aux, Tape : 108dB/80dB
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
Loudness control (Vol-30dB)	9dB(100Hz)
Subsonic filter	18 Hz, -6dB/oct.
Output bandwidth (0.04% distortion rate, 8 Ω)	5 Hz to 60 kHz
Phono maximum allowable input (Phono → Tape Rec, 1 khz, 0.006%)	Phono MM:190mV Phono MC:15mV
Output Level / Impedance	Tape rec : 150mV/330 Ω
Power outlet	Power switch interlock : 2 systems, 100W Power switch not linked : 1 system, 400W
Pwer	100 VAC, 50Hz/60Hz
Rated power consumption (Electrical Appliance and Material Control Law)	270W
Maximum external dimensions	Width 440x Height 144x Depth 343 mm
Weight	10.0kg