KENWOOD KAC-929 Power Amplifier User Manual
- June 16, 2024
- KENWOOD
Table of Contents
KENWOOD KAC-929 Power Amplifier
Product Information
Specifications
- Model: KAC-929
- Type: Stereo/Bridgeable Amplifier
- Maximum Power: 30W x 2 (stereo mode), 60W x 1 (bridge mode)
- Fuse: 30A x 2
- Power Input: BATT. (Battery), GND (Ground)
- Speaker Output: P.CON OUTPUT, LEFT, RIGHT (stereo mode), BRIDGED (bridge mode)
Overview
Block Diagram
Circuit Description
The KAC-929 amplifier includes an expander circuit that expands the range of audio. This circuit inputs a signal with a variation over 10 dB and outputs a signal with a variation over 20 dB. It can make loud sounds louder and small sounds smaller. The expander circuit is designed to provide powerful audio with punch when the input level is above a certain level.
Adjustment
- Connect a cassette receiver or CD receiver to the amplifier.
- Set the volume of the receiver to 0.
- Connect a DC voltmeter between CN2 (L/R) and J2 (SP.OUT, L+/R-) on the amplifier.
- Adjust VR3 (L ch) and VR4 (R ch) to obtain a reading of 2.5mV on the DC voltmeter.
CIRCUIT DESCRIPTION
Expander Circuit
The expander circuit has been designed to expand the range of audio.
Specifically, it inputs a signal with a variation over 10 dB and outputs a
signal with a variation over 20 dB. In other words, the expander circuit can
make loud sounds louder and small sounds smaller.
Its characteristic is as shown in Figure 1, which shows its characteristic (B)
in comparison with the characteristic of an ordinary amp (A).
- (A) Characteristic of ordinary amp
- (B) Characteristic of expander
- (C) Characteristic of expander amp used in the set
The point of incorporating an expander circuit in this set is to make the
audio more powerful, with a punch in it.
The expander amp used in the set outputs similar audio to an ordinary amp when
the input level is low, while it can provide powerful audio with a punch when
the input level is above a certain level.
Figure 2 shows the characteristics of the expander amp used in this set.
It shows that the effect described above is applied in the same way all over
the bandwidth
Appendix
IC4 block diagram is as shown in Figure 3.
ADJUSTMENT
EXPLODED VIEW
PARTS LIST
New Parts
- Parts without Parts No. are not supplied.
- Parts without Parts No. are not supplied.
- Parts without Parts No. are not supplied.
PARTS DESCRIPTIONS
SPECIFICATIONS
Audio Section
- Max Power Output (4Ω)
- Normal ………………………………………………………. 300W x 2
- Bridge ……………………………………………………… 1000W x 1
- Rated Power Output (4Ω)
- Normal (20Hz-20KHz, 0.08% THD) ………………. 150W x 2
- Normal (DIN45324, +B=14.4V) …………………….. 150W x 2
- Bridge (1KHz, 0.8% THD) ……………………………. 460W x 1
- Rated Power Output (2Ω)
- Normal (1KHz, 0.8% THD) …………………………… 230W x 2
- Frequency Response (+0, -1dB) ………………….. 5Hz – 50kHz
- Signal to Noise Ratio ………………………………………….. 100dB
- Sensitivity (MAX) (rated output) ……………………………… 0.2V
- Sensitivity (MIN) (rated output) ……………………………….. 5.0V
- Input Impedance …………………………………………………. 10kΩ
- Low Pass Filter (18dB/oct.) …………. 50Hz – 200Hz (variable)
- Bass Boost Circuit (90Hz) ……………………. OFF / +6 / +12dB
General
- Operating Voltage (11V-16V allowable) …………………. 14.4V
- Current Consumption (1KHz, 10% THD) ………………….. 43A
- Installation size (Width x Height x Depth)
- …………………………………… 261mm x 57mm x 350mm
- Weight …………………. 4.6kg
KENWOOD CORPORATION
14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo, 150-8501 Japan
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KENWOOD SERVICE CORPORATION
P.O. Box 22745, 2201 East Dominguez Street, Long Beach, CA90801-5745, U.S.A. -
KENWOOD ELECTRONICS CANADA INC.
6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8 -
KENWOOD ELECTRONICS LATIN AMERICA S.A.
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KENWOOD ELECTRONICS BRASIL LTDA.
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KENWOOD ELECTRONICS UK LIMITED
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KENWOOD IBÉRICA S.A.
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(A.C.N. 001 499 074)
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KENWOOD ELECTRONICS (THAILAND) CO., LTD.
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KENWOOD ELECTRONICS SINGAPORE PTE LTD.
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FAQ
Q: What is the maximum power of the KAC-929 amplifier?
A: The maximum power of the KAC-929 amplifier is 30W x 2 in stereo mode and 60W x 1 in bridge mode.
Q: What is the purpose of the expander circuit?
A: The expander circuit expands the range of audio, making loud sounds louder and small sounds smaller, providing powerful audio with punch.
Q: How do I adjust the idle current of the amplifier?
A: Follow the adjustment procedure provided in the user manual, which involves connecting a DC voltmeter and adjusting VR3 (L ch) and VR4 (R ch) to obtain a specific reading.