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Adastra US90 Compact 100V Slave Amplifier

£19999
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Description

The Adastra US90 is a 100V slave amplifier built into a half-width 1U housing, designed for small to medium PA installations. It gives you a straightforward way to add amplification to an existing setup, whether you're running a 100V line system or an 8 ohm speaker load. The mono output connects via a removable screw terminal (Euroblock) connector on the rear panel, so wiring stays tidy and serviceable.

Alongside the standard RCA line input and output, the US90 has a 100V input on removable screw terminals. This lets you connect the amplifier in parallel with existing 100V speakers, so you can extend a system directly from the speaker cable without reworking the whole installation. It also includes 24V fire alarm mute contacts via relay, letting the amplifier drop out when triggered by an alarm panel. The unit uses Class D construction with a transformer output stage.

We supply the US90 with rack-mounting hardware, and the brackets can be configured two ways: mount a single unit against a wall or under a worktop, or pair two units side by side to fill a standard 1U rack space. Electrical figures include THD under 0.4% at 1kHz, an 80dB signal-to-noise ratio and a frequency response of 100Hz to 18kHz. The power supply runs from 170-264Vac, 50Hz via IEC. Input sensitivity is -10dB on the line input with a 1k ohm input impedance, making it a practical building block for growing a fixed-line PA system.

Specification
Output power : rms 90W
Dimensions 330mm x 210mm x 44mm
Weight 2.40KG
Power supply 170-264Vac, 50Hz (IEC)
Amplifier : construction Class D + transformer output
Inputs Line (RCA), 100V (Euroblock +/-)
Line output 2 x RCA (mono)
Speaker output Euroblock terminals: 100V / 8 Ohm / Com
Mute 24V relay contacts
THD <0.4% @ 1kHz
Input impedance 1k Ohm
Input sensitivity -10dB (line)
SNR 80dB
Frequency response 100Hz - 18kHz
Downloads

Product Manual

Frequently Asked

Can the US90 extend an existing 100V speaker system?

Yes. The 100V input on removable screw terminals lets you connect the amplifier in parallel with existing 100V speakers, so you can extend the system directly from the speaker cable.

Does it work with 8 ohm speakers as well as 100V line?

Yes. The mono output can drive either a 100V line or an 8 ohm speaker load, selected via the Euroblock speaker output terminals on the rear panel.

How does the fire alarm mute work?

The US90 has 24V relay mute contacts, so it can be muted when triggered by a fire alarm panel or similar control system.

How is the amplifier mounted?

It ships with rack-mounting hardware. You can mount a single unit against a wall or under a worktop, or fit two units together in a standard 1U rack space.

What inputs and outputs does it have?

Inputs are RCA line and 100V on Euroblock terminals. Outputs are 2 x RCA line (mono) and a Euroblock speaker output for 100V, 8 ohms and common.

What type of amplifier is it?

It uses Class D construction with a transformer output stage, giving mono output for fixed-line PA installations.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Adastra US90 is a 100V slave amplifier built into a half-width 1U housing, designed for small to medium PA installations. It gives you a straightforward way to add amplification to an existing setup, whether you're running a 100V line system or an 8 ohm speaker load. The mono output connects via a removable screw terminal (Euroblock) connector on the rear panel, so wiring stays tidy and serviceable.

    Alongside the standard RCA line input and output, the US90 has a 100V input on removable screw terminals. This lets you connect the amplifier in parallel with existing 100V speakers, so you can extend a system directly from the speaker cable without reworking the whole installation. It also includes 24V fire alarm mute contacts via relay, letting the amplifier drop out when triggered by an alarm panel. The unit uses Class D construction with a transformer output stage.

    We supply the US90 with rack-mounting hardware, and the brackets can be configured two ways: mount a single unit against a wall or under a worktop, or pair two units side by side to fill a standard 1U rack space. Electrical figures include THD under 0.4% at 1kHz, an 80dB signal-to-noise ratio and a frequency response of 100Hz to 18kHz. The power supply runs from 170-264Vac, 50Hz via IEC. Input sensitivity is -10dB on the line input with a 1k ohm input impedance, making it a practical building block for growing a fixed-line PA system.

    Specification
    Output power : rms 90W
    Dimensions 330mm x 210mm x 44mm
    Weight 2.40KG
    Power supply 170-264Vac, 50Hz (IEC)
    Amplifier : construction Class D + transformer output
    Inputs Line (RCA), 100V (Euroblock +/-)
    Line output 2 x RCA (mono)
    Speaker output Euroblock terminals: 100V / 8 Ohm / Com
    Mute 24V relay contacts
    THD <0.4% @ 1kHz
    Input impedance 1k Ohm
    Input sensitivity -10dB (line)
    SNR 80dB
    Frequency response 100Hz - 18kHz
    Downloads

    Product Manual

    Frequently Asked

    Can the US90 extend an existing 100V speaker system?

    Yes. The 100V input on removable screw terminals lets you connect the amplifier in parallel with existing 100V speakers, so you can extend the system directly from the speaker cable.

    Does it work with 8 ohm speakers as well as 100V line?

    Yes. The mono output can drive either a 100V line or an 8 ohm speaker load, selected via the Euroblock speaker output terminals on the rear panel.

    How does the fire alarm mute work?

    The US90 has 24V relay mute contacts, so it can be muted when triggered by a fire alarm panel or similar control system.

    How is the amplifier mounted?

    It ships with rack-mounting hardware. You can mount a single unit against a wall or under a worktop, or fit two units together in a standard 1U rack space.

    What inputs and outputs does it have?

    Inputs are RCA line and 100V on Euroblock terminals. Outputs are 2 x RCA line (mono) and a Euroblock speaker output for 100V, 8 ohms and common.

    What type of amplifier is it?

    It uses Class D construction with a transformer output stage, giving mono output for fixed-line PA installations.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.