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Radio Design Labs

Radio Design Labs RU-PA518 10 W Stereo / 18 W Mono Audio Amplifier - 8 Ω

£420.00inc. VAT
£350.00 ex. VAT
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Bought in the UK, backed in the UKWhy it matters →
  • Sourced through UK distribution
  • UK manufacturer warranty
  • UK-based engineers
  • No import duty or customs charges
  • GBP pricing, UK VAT invoices
Return within 14 days
Installation services availablePurchase orders: education customers only
7 Years Warranty Included
Key specifications
Inputs (2)Line level (+4 dBu nominal bal, -10 dBV nominal unbalanced)
Input Impedance20 kΩ balanced bridging, or 10 kΩ unbalanced
Input ConnectorsBalanced on barrier block; Unbalanced on phono jack
Minimum Input Signal LevelsBalanced: -6 dBu for rated power Unbalanced: -20 dBV for rated power
Maximum Input Signal LevelsBalanced: +20 dBu Unbalanced: +6 dBV
Frequency Response20 Hz to 40 kHz (±1 dB, stereo mode,8 Ω output @ 5 W RMS) 25 Hz to 40 kHz (±1 dB, stereo mode, 4 Ω output @ 9 W RMS) 25 Hz to 30 kHz (±1 dB, bridge mono mode, 8 Ω output @ 18 W RMS)
THD+N< 0.05% below rated power (1 kHz) < 0.1% below 18 W RMS (50 Hz to 20 kHz)
Noise< -85 dB below rated output
All 15 specifications

Description

The RU-PA518 is a very versatile audio amplifier ideally suited to a wide variety of installations. This amplifier features two modes of operation: stereo and bridged mono. Each mode is switch selectable on the rear panel.

Full specifications Datasheet Compare alternatives

In stereo mode, each of the two inputs feed its respective left or right output. Front-panel level controls set the gain for left (channel A) and right (channel B). When the rear-panel switch is set to the bridge mode, the two inputs (A and B) are mixed together and fed to the output.

In either the stereo or mono modes, an internal audio peak limiter may be turned on using a rearpanel switch. The limiter protects the speakers from high transient audio peaks which permits more of the amplifier’s power to be delivered to the speakers without clipping. This allows the RU-PA518 to deliver more unclipped power than is possible in a typical power amplifier of similar power rating. A front-panel LED flashes when the peak limiter operates, permitting accurate audio gain setting when operating at high levels.

In stereo mode, the RU-PA518 can be connected to either an 8 Ω or 4 Ω load, delivering more than 5 W RMS at 8 Ω or more than 9 W RMS into 4 Ω. In the bridge mono mode, the amplifier can deliver more than 18 W RMS into 8 Ω.

Each of the audio inputs is provided with both balanced and unbalanced connections. Balanced audio is connected through a rear-panel full-size barrier block. Unbalanced audio is connected through a standard phono input jack. Outputs are available on a barrier block. 24 Vdc power is connected through either barrier block terminals or through a dc power jack mounted on the rear panel. Front-panel controls include two audio level knobs and a power switch with an LED indicator.

With its high performance, small size and professional appearance, the RU-PA518 is the ideal power amplifier in its power range. Use the RU-PA518 individually, or combine it with other RDL RACK-UP or STICK-ON products as part of a complete audio/video system.

Key features:

• 9 W RMS per Channel Stereo into 4 Ω

• 18 W RMS Mono into 8 Ω

• Selectable Stereo or Bridged Mono

• Selectable Built-In Peak Limiter

• 1/3 Rack, High-Density Rack Mounting

• Front-Panel Control for 2 Inputs

Manufacturer part number RU-PA518.

Key features

Inputs (2)

Line level (+4 dBu nominal bal, -10 dBV nominal unbalanced)

Input Impedance

20 kΩ balanced bridging, or 10 kΩ unbalanced

Input Connectors

Balanced on barrier block; Unbalanced on phono jack

Minimum Input Signal Levels

Balanced: -6 dBu for rated power Unbalanced: -20 dBV for rated power

Maximum Input Signal Levels

Balanced: +20 dBu Unbalanced: +6 dBV

Frequency Response

20 Hz to 40 kHz (±1 dB, stereo mode,8 Ω output @ 5 W RMS) 25 Hz to 40 kHz (±1 dB, stereo mode, 4 Ω output @ 9 W RMS) 25 Hz to 30 kHz (±1 dB, bridge mono mode, 8 Ω output @ 18 W RMS)

THD+N

< 0.05% below rated power (1 kHz) < 0.1% below 18 W RMS (50 Hz to 20 kHz)

Noise

< -85 dB below rated output

Technical specifications

Connectivity
Inputs (2)Line level (+4 dBu nominal bal, -10 dBV nominal unbalanced)
Input Impedance20 kΩ balanced bridging, or 10 kΩ unbalanced
Input ConnectorsBalanced on barrier block; Unbalanced on phono jack
Minimum Input Signal LevelsBalanced: -6 dBu for rated power Unbalanced: -20 dBV for rated power
Maximum Input Signal LevelsBalanced: +20 dBu Unbalanced: +6 dBV
Output PowerStereo Mode: > 5 W RMS per channel Into 8 Ω > 9 W RMS per channel into 4 Ω Mono Mode: > 18 W RMS into 8 Ω
Power & Physical
DimensionsHeight: 1.7 in. (4.3 cm), Width: 5.8 in (15.0 cm), Depth 8.0 in. (20.3 cm)
Shipping Weight1.83 lbs.
General
Frequency Response20 Hz to 40 kHz (±1 dB, stereo mode,8 Ω output @ 5 W RMS) 25 Hz to 40 kHz (±1 dB, stereo mode, 4 Ω output @ 9 W RMS) 25 Hz to 30 kHz (±1 dB, bridge mono mode, 8 Ω output @ 18 W RMS)
THD+N< 0.05% below rated power (1 kHz) < 0.1% below 18 W RMS (50 Hz to 20 kHz)
Noise< -85 dB below rated output
CMRR> 55 dB (50 Hz to 120 Hz)
Crosstalk< -60 dB (stereo mode, 1 kHz)
Ambient Operating Environment0° C to 40° C; 20° C recommended
Power RequirementGROUND-REFERENCED, 24 Vdc @ 1500 mA (RMS output) 1000 mA (Continuous music or voice)

Documents

Radio Design Labs RU-PA518 10 W Stereo / 18 W Mono Audio Amplifier - 8 Ω — RDL Datasheet

Delivery & returns

Estimated delivery 9 Sept - 13 Sept. UK mainland delivery only. Some large or made-to-order items carry longer lead times, shown on the product page.

Unused items in original packaging can be returned within 14 days of delivery — see the returns policy for how business and consumer returns differ. Faulty items are covered under manufacturer warranty and by your statutory rights.

Full delivery & returns policy

Bought in the UK, backed in the UK

  • This item is sourced through UK distribution and ships to you from within the UK, so the order never crosses a customs border.

  • The manufacturer warranty is honoured here in the UK. If something fails, you deal with us, not with an overseas seller in another time zone.

  • Our own UK-based engineers install, commission and support what we sell, and can attend site when a system needs hands on it.

  • Delivered within the UK mainland, so there is no import duty, customs charge or courier handling fee waiting for you on delivery.

  • Prices are in pounds sterling with proper UK VAT invoices, and purchase orders are accepted from approved education accounts: no currency conversion and no surprises at the door.

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Payment & security

Pay securely by card. Education customers can apply for a 30-day purchase order account.

Schools, colleges, sixth forms, universities and multi-academy trusts can order on invoice, with no card payment required. Purchase orders and credit terms are for education customers only.

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