PTH Series
Professional Power amplifiers
1. Introduction
1.1 General notes
'PT' stands for Power Transfer, which expresses exactly what
the PT series power amplifiers do: they 'transfer' a few
milliwatts of electrical signal power at the inputs into a couple
of hundred watts at the speakers outputs, without changing
the shape of the signal and adding as little noise or other
spurious signals as possible. We put this signal transfer
under the command of one of the most technically advanced
control systems, including NLR (Non-Linearity Restoration)
and TCL (Temperature Control by Limiting). The 'H' in 'PTH'
indicates that this is the 'Heavy' version of PT. It is build with
a conventional power supply which includes a toroidal
transformer, responsible for the extra weight.
1.2 Features of the PTH series amplifiers
All PTH series power amplifiers are equipped with:
High efficiency 'flow through' cooling system with 2
proportional to temperature controlled fans and a large
surface hybrid heatsink.
LED indicators for ready/protect, signal, NLR (distortion
limiter) and TCL (Temperature Controlled Limiter).
Electronically balanced inputs, equipped with Neutrik
Combo sockets and parallel XLR outputs for easy setup
of multiple amplifier systems.
Oversized, non-compromise power supply with low-flux,
magnetically screened toroidal transformer.
3 Speakon output connectors for stereo and bridge mode.
Soft-start anti surge circuitry for maximum fuse protection at
startup.
Heavy duty relay in the output stage for speaker DC
protection.
High efficiency class H output stage for lowest possible
internal power dissipation on PTH 5,7 and 9.
Protection circuitry against clipping, over temperature,
mismatched loads, open/short outputs and DC voltage at
output.
Current feedback input stage with ultra-fast internal-loop
slew rate.
1.3 PTH series models
PTH series amplifiers are available in 4 models:
Model
Rated output power per channel
into 4 Ohms
into 8 Ohms
PTH 3
330 W
220 W
PTH 5
540 W
330 W
PTH 7
720 W
450 W
PTH 9
920 W
600 W
5
PTH Series
User Manual
BRIDGED MONO OPERATION: INPUT SELECTOR SWITCH TO BRIDGED
POSITION. INPUT SIGNAL TO CH. 1 ONLY. CONNECT SPKR TO 1+ AND 1- OF
BRIDGED OUT CONNECTOR. MATCH CH. 1 AND CH. 2 GAINS ON THE FRONT
PANEL AND REGULATE LEVEL WITH BOTH GAIN CONTROLS SIMULTANEOUSLY.
1
2
3
Input
1 = SIGNAL GROUND
2 =
3 = SIGNAL -
SPEAKER OUT 1
1+ = SIGNAL CH. 1
1 - = GROUND CH. 1
2+ = SIGNAL CH. 2
SPEAKER OUT 2
1+ = SIGNAL CH. 2
1 - = GROUND CH. 2
BRIDGED OUT
1+ = SIGNAL CH. 1
1 - = SIGNAL CH. 2
2+ = GROUND CH. 1
MODE
PARALLEL
DUAL
BRIDGED
DIRECT
OUT
INPUT
WARNING!
HAZARDOUS
ENERGY!
MAKE PROPER SPEAKER CONNECTIONS.
WARNING
THIS APPARATUS MUST BE EARTHED TO REDUCE
THE RISK OF ELECTRIC SHOCK. DO NOT EXPOSURE
THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS
RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR
1
2
1
2
SPEAKER OUT
BRIDGED
OUT
MIN. 4 OHM
MIN.
2 OHM
PTH9-01BB
SERIAL NR: PTH9-01BB-0001
DATE OF MANUFACTURE: 28.06.01
POWER REQUIREMENTS:
210-244V AC 50/60Hz 4100W MAX
C A UT ION
R IS K OF E L E C T R IC
S HOC K
!
PROTECT
SIGNAL
NLR
READY
CH 1
TCL
LIMITER
0
2
4
6
8
10
12
14
18
24
• dB
PROTECT
SIGNAL
NLR
READY
CH 2
TCL
LIMITER
0
2
4
6
8
10
12
14
18
24
• dB
PTH 9
2 x 900W PROFESSIONAL POWER AMPLIFIER
POWER
r
MADE IN BELGIUM
