KASPER KMA-8240

Product overview

The KASPER KMA-8240 is a 240 W mixer amplifier with a built-in MP3 player, FM tuner and Bluetooth: a powerful, versatile all-in-one solution for professional audio installations.

Designed for commercial spaces, public address systems and multi-source audio environments, the KMA-8240 combines amplification, media playback and flexible connectivity for seamless sound management. It drives 100 V and 70 V loudspeaker lines or 4-16 Ω loudspeakers, has three microphone inputs with priority muting, two AUX inputs, USB and SD playback, an FM tuner and Bluetooth, plus bass and treble controls, an LED level meter and protection against overload, short circuit and high temperature. It is ideal for retail, schools, restaurants, offices and public address systems.

Key features

• 240 W rated output for 100 V (39 Ω), 70 V (19 Ω) or low impedance 4-16 Ω
• Single zone output (100 V)
• Built-in Bluetooth, FM tuner, USB and SD playback
• 3 MIC inputs with priority muting: MIC1 overrides other input signals at 0-30 dB
• 2 AUX inputs (RCA) and a 0.775 V line output
• Bass ±10 dB at 100 Hz and treble ±10 dB at 12 kHz
• LED level indicator and power indicator
• Protection: AC fuse, overload, short circuit and high temperature
• DC 12 V cooling fan

Every source built in

The built-in player plays music from USB and SD, receives FM radio through the FM ANT input and streams from a phone over Bluetooth. Two RCA AUX inputs take an external player, and the line output feeds another amplifier or a recorder.

Announcements always come first

Three microphone inputs, one of them on the front panel, have their own level controls. When someone speaks on MIC1, the priority muting lowers the other input signals by 0 to 30 dB, so announcements are heard over the background music.

Flexible loudspeaker outputs

One screw terminal block carries COM, 4-16 Ω, 70 V and 100 V outputs, so the KMA-8240 can drive a 100 V or 70 V loudspeaker line or low-impedance loudspeakers with its 240 W rated output. MASTER, BASS and TREBLE controls on the front set the overall sound.

In the box

• KMA-8240 mixer amplifier
• Power cord (3 x 0.75 mm², 1.5 m)

KASPER KMA-8240: frequently asked questions

Which loudspeakers can the KMA-8240 drive?

100 V lines (39 Ω), 70 V lines (19 Ω) or low-impedance loudspeakers of 4-16 Ω, with 240 W rated output power.

Which music sources are built in?

An MP3 player with USB and SD slots, an FM tuner and Bluetooth, plus two RCA AUX inputs.

Does it have microphone priority?

Yes. MIC1 overrides the other input signals at 0-30 dB, so announcements are heard over the music.

How much power does it draw?

AC 220-240 V, 50-60 Hz, with 350 W power consumption (fuse 6 A).

Where can I buy the KASPER KMA-8240 in India?

The KASPER KMA-8240 is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Retail store background music and paging

Music and announcements across a shop floor.

Connections

Setup

1. Wire the 100 V speaker line to the COM and 100 V terminals.
2. Play music from Bluetooth, USB or SD and set its level with AUX1/MP3.
3. Set MASTER for the level wanted on the floor.
4. Use MIC1 for announcements: the music is lowered automatically.

Tip: The LED meter helps keep levels below CLIP.

Workflow 2: School announcements

Announcements to classrooms, corridors and grounds on one line.

Connections

Setup

1. Connect the speaker line to the 100 V terminal.
2. Set the microphone levels with MIC1-MIC3.
3. Set MASTER.
4. Speak on MIC1 for priority announcements.

Tip: MIC1 overrides other input signals at 0-30 dB.

Workflow 3: Restaurant or cafe music

Background music with occasional announcements.

Connections

Setup

1. Wire the speakers to the matching terminal.
2. Choose the music source and set its level.
3. Shape the sound with BASS and TREBLE.
4. Set MASTER for a comfortable level.

Tip: The FM tuner gives a quick alternative music source.

Workflow 4: Office paging

Paging and soft music for offices.

Connections

Setup

1. Wire the office speaker line to the 100 V output.
2. Play background music from USB or SD.
3. Set MIC and AUX levels.
4. Use MIC1 for paging with priority muting.

Tip: MIC2 and MIC3 are on the rear panel.

Workflow 5: Low-impedance speakers for a small hall

A hall or showroom with 4-16 Ω loudspeakers.

Connections

Setup

1. Connect the loudspeakers to the 4-16 Ω terminals.
2. Set MIC and AUX levels.
3. Raise MASTER gradually.
4. Adjust BASS and TREBLE.

Tip: Keep the total load within the 240 W rated output.

Workflow 6: Recording or extending the system

Send the programme to a recorder or another amplifier.

Connections

Setup

1. Connect the LINE OUTPUT to the recorder or amplifier input.
2. Set the sources and levels as usual.
3. Check the level on the connected device.
4. Use the second amplifier for extra areas or power.

Tip: The line output level is 0.775 V (0 dBV).