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1U Mixer-amps & Slave amps
A121U
Mixer-amp + USB/SD/FM 120W
A251U
Mixer-amp + USB/SD/FM 250W
S121
Slave amp 250W
S251
Slave amp 250W
User Manual
Features:
2 Mixer-amp models and 2 Slave versions
Transformer coupled output for 100V or 4-16Ω operation
USB/SD/FM audio player on mixer-amp models
Compact 1U rack-mount format
Dual fan-cooled
High efficiency toroidal transformers
www.adastra-pa.com
952.903
952.905
952.908
952.911
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Related Manuals for Adastra A121U
Summary of Contents for Adastra A121U
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Page 1: User Manual
1U Mixer-amps & Slave amps A121U Mixer-amp + USB/SD/FM 120W 952.903 A251U Mixer-amp + USB/SD/FM 250W 952.905 S121 Slave amp 250W 952.908 S251 Slave amp 250W 952.911 User Manual Features: 2 Mixer-amp models and 2 Slave versions Transformer coupled output for 100V or 4-16Ω operation ... -
Page 2: Front Panel
Introduction: Thank you for choosing this Adastra 1U-series amplifier This product has been designed to offer reliable, high quality mixing for stage and/or studio applications with unfailing consistency. In order to gain the best results from this equipment and avoid damage through misuse, please read and follow these instructions and retain for future reference. -
Page 3: Rear Panel
MIC1 + MIC 2 – 2 x balanced 6.3mm jack MIC inputs Connection The Adastra A1U-series mixer-amps and S1-series slave can drive EITHER 100V line OR 4-16Ω speakers. Both types of speaker should NOT be connected together to the same amplifier. - Page 4 Low Impedance Speakers If standard low impedance (4Ω, 8Ω or 16Ω) speakers are being used, these should be connected to the 6.3mm output sockets on the rear panel using quality speaker jack leads. Both of these outputs are fed from the same amplifier section, which is mono.
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Page 5: Next Track
For MIC channels priority, increasing the VOX control will cause the level of playback through the LINE or USB/SD/FM channels will be reduced when speaking into MIC1 or MIC2. Adjust this control to achieve the required amount of “ducking” of the other channels when MIC channels are used. SPECIFICATIONS Model A121U A251U S121 S251 Power supply Switchable 110/240Vac, 50/60Hz (IEC) Output: RMS @ 4Ω... - Page 6 Ensure that 100V and 4Ω or 8Ω speakers are not both connected Ensure that total load across speaker jack outputs is not less than 4Ω Note: for further troubleshooting, refer equipment to qualified service personnel for testing © Adastra 2011...