Hill Audio LPA SERIES, User Manual

PAGE 4

Functional Description

The LPA series is an analog audio power amplifier with two channels, which can be used with inde-
pendent input signals (stereo mode), identical input signal (parallel mode) or in bridge mode as a 
single channel amplifier. It displays all relevant status information on a 3-color front-panel display and 
offers a multitude of input and output connections for great application versatility. 

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AC inlet. Depending on the version, this may be an IEC power inlet or a PowerCon™-compatible 
power inlet. For versions with IEC inlets, use the supplied AC cord to connect the unit to AC 
mains. For versions with PowerCon™-compatible power inlet, use a cable equipped with a Pow-
erCon™ compatible plug. Make sure voltage and frequency stated and set on the unit comply 
with your local AC supply. 

Fuse holder | Circuit breaker. Depending on the version, the AC mains fuse is either a cartridge 
type located in a small drawer close to the AC inlet (for IEC inlet versions) or a resettable 
breaker type located above the AC inlet for versions with PowerCon™-compatible inlets. To 
change a cartridge type fuse, unplug the AC cord first, pull out the fuse drawer and replace the 
fuse ONLY with a fuse of SAME voltage and rating. To reset a tripped circuit breaker type fuse, 
simply switch the fuse back to ON status. If the fuse blows again after replacement, hand over 
the unit to qualified service personnel. 

Speakon™-compatible speaker outputs for stereo and parallel mode operation (see explana-
tion in chapter “setting the operation mode”). Connect your speaker leads with matching 
connectors here. Alternatively, speakers can be connected to the two black+red binding post 
speaker outputs (4). Do not connect speakers to both these Speakon™-compatible outputs 
and the binding post outputs (4) or the bridge output (5) at the same time. 

Binding post speaker outputs for stereo, parallel and bridge mode operation (see explanation  
in chapter “setting the operation mode”). Connect your speaker leads here, using one pair of 
red and black posts each to connect leads to speakers A and B respectively if you use stereo 
and parallel mode, and use both red posts to connect leads to your speaker for bridge mode 
operation. Alternatively, speakers can be connected to the Speakon™-compatible outputs (3) 
for stereo or parallel mode operation and to the Speakon™-compatible outputs (5) for bridge 
mode operation. Do not connect speakers to both these bindings post outputs and the 
Speakon™-compatible outputs (3, 5) at the same time. 

Speakon™-compatible speaker output for bridge mode operation (see explanation in chapter 
“setting the operation mode”). Connect your speaker lead with matching connector here. 
Alternatively, the speaker can be connected to the two red binding post speaker outputs (4). 
Do not connect speakers to this Speakon™-compatible output and the binding post outputs (4) 
or the Speakon™-compatible speaker outputs (3) at the same time. 

Fan ventilation slots. The amplifier pushes the cooling air out of these slots. Make sure these 
slots remained unobstructed. For more information about cooling, see the chapter “Installa-
tion, Cooling and Wiring”. 

Channel signal inputs. These are a balanced terminal blocks designed to accept matching 
connectors which carry input signals for channels A and B respectively. Channel B input 
remains unused in parallel and bridge operation modes (see explanation of operation modes 
in chapter “setting the operation mode”). Alternatively, use inputs (8) to connect input sources. 
Do not connect input sources to these connectors and the inputs (8) at the same time. 

Channel signal inputs. These are - depending on version - balanced female XLR or Combo 
(XLR+TRS) connectors for input signals to channels A and B respectively. Channel B input 
remains unused in parallel and bridge operation modes (see explanation of operation modes 
in chapter “setting the operation mode”). Alternatively, use inputs (7) to connect input sources. 
Do not connect input sources to these connectors and the inputs (7) at the same time.

USER MANUAL - LPA SERIES AMPLIFIERS