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

1. Connect a cassette receiver or CD receiver to the amplifier.
2. Set the volume of the receiver to 0.
3. Connect a DC voltmeter between CN2 (L/R) and J2 (SP.OUT, L+/R-) on the amplifier.
4. 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

• 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.
  P.O. Box 55-2791 Paitilla, Plaza Credicorp Bank Panama, Piso 9, Oficina 901, Calle 50, Panama, Republic of Panama

• KENWOOD ELECTRONICS BRASIL LTDA.
  Av. Moema, 170-17˚, Andar-Cobertura “B”, Ed. Maximum Service Center, 04077-020 Moema, São Paulo-SP-Brasil

• KENWOOD ELECTRONICS UK LIMITED
  Kenwood House, Dwight Road, Watford, Herts, WD1 8EB, United Kingdom

• KENWOOD ELECTRONICS DEUTSCHLAND GMBH
  Rembrücker Str. 15, 63150 Heusenstamm, Germany

• KENWOOD ELECTRONICS FRANCE S.A.
  13, Boulevard Ney, 75018 Paris, France

• KENWOOD ELECTRONICS BELGIUM N.V.
  Mechelsesteenweg 418, B-1930 Zaventem, Belgium

• KENWOOD ELECTRONICS ITALIA S.p.A.
  Via G. Sirtori 7/9, 20129 Milano, ltaly

• KENWOOD IBÉRICA S.A.
  Bolivia, 239-08020 Barcelona, Spain

• KENWOOD ELECTRONICS AUSTRALIA PTY. LTD.
  (A.C.N. 001 499 074)
  16 Giffnock Avenue, Centrecourt Estate, North Ryde, N.S.W. 2113, Australia

• KENWOOD ELECTRONICS (HONG KONG) LTD.
  Unit 3712-3724, Level 37, Tower 1, Metroplaza, 223 Hing Fong Road, Kwai Fong, N.T., Hong Kong

• KENWOOD ELECTRONICS GULF FZE
  P.O.Box 61318, Jebel Ali, Dubai, U.A.E.

• KENWOOD ELECTRONICS (THAILAND) CO., LTD.
  2019 New Pechburi Road, Bangkapi, Huaykwang, Bangkok, 10320 Thailand

• KENWOOD ELECTRONICS SINGAPORE PTE LTD.
  1 Genting Lane, #07-00, Kenwood Building, Singapore 349544

• KENWOOD ELECTRONICS (MALAYSIA) SDN BHD

  4.01 Level 4, Wisma Academy Lot 4A, Jalan 19/1,

  46300 Petaling Jaya, Selangor Darul Ehsan, Malaysia

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.

References

• IIS7
• Manual-Hub.com – Free PDF manuals!

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