Lab.gruppen iP Series IP 900 User Manual page 5

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Thank you for purchasing a Lab.gruppen power amplifier. This manual contains important information
on operating your amplifier correctly and safely. Please take some time and read this manual to
familiarize you with the advanced features of this amplifier.
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Carefully open the shipping carton and check for any noticeable damage. Every Lab.gruppen amplifier
is tested and inspected before leaving the factory and should arrive in perfect condition. If found to be
damaged, notify the shipping company immediately. Only the consignee may institute a claim with the
carrier for damage incurred during shipping. Be sure to save the carton and packing materials for the
carrier's inspection.
It is also advisable to save the carton and packing material, even if the amplifier is undamaged. Should
you ever need to ship the amplifier, always use the original packing.
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Figure 1 front panel
1. Input level attenuators
These controls are used to alter the signal level entering the amplifier. They are calibrated in dB to assist
the setup of active loudspeaker systems or cut down unwanted noise from the input signal. (See page 13).
2. Protect indicator
This indicator illuminates if the amplifier tries to operate above its maximum operating temperature
(90° C). The indicator first comes on as a warning to either turn down the input level or check the
°
cooling arrangements. Beyond the maximum temperature the amplifier will mute the input signal. Once
the cooling fans have brought the output heat sinks back to normal operating temperature the input
signal is un-muted.
This indicator also illuminates when signals above 12 kHz are continuously present at full power at the
output terminals or if short circuit protection is activated. If this occurs the input signal is muted, and the
process cycles until the VHF signal is no longer present or the short is removed. (See page 14).
3. Clip/limit indicator
This indicator signals when the amplifier output is clipping or limiting. It has two different indication
states:
If the clip limiter is engaged, it has a short time constant and it illuminates briefly. (See page 13).
If the clip limiter is not engaged, it has an increased time constant and it illuminates for a longer period.
4. Signal present indicator.
Illuminates at –40dB below full output signal.
5. On indicator
The two bottom green "ON" LEDs indicate that the output circuits are receiving the correct rail voltage.
6. Power switch
Turns mains power on or off.
(See page 8 and 13)
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