44C series

• 44C series
4 Channel Advanced Contractor Amplifiers
Linea Research 4 channel
amplifiers present a unique
combination of power and audio
performance combining
advanced DSP and network
control with many contractor
friendly features. Sharing the
same feature set and form factor
as the 88C series amplifiers and
available in models developing
between 1,500Watts and 5,000
Watts per channel (or 10,000
Watts for a bridged pair).
Uniquely each channel can be
optimised to deliver its power
into 2, 4 or 8 Ohm nominal loads
as well as 25V, 70V & 100V
constant Voltage (CV) lines. This
offers designers and integrators
unparalleled flexibility and cost‐
effectiveness. Using state of the
art components and a finely
optimised design results in
generous power reserves that
ensure pristine sound quality is
maintained even under the most
extreme conditions.
•
Four channels of sonically pure Class D amplification
•
Unique, precise, 96kHz digital signal processing
Model
44C20
44C10
44C06
•
Over‐designed switch mode power supply
2 Ohm
5,000
2,500
1,500
•
Tamper‐proof front panel
4 Ohm
3,000
2,500
1,500
•
Contractor friendly connectors
8 Ohm
1,500
1,500
1,500
•
Contact closure control ports and relay status outputs
•
Ethernet, RS232 and RS485 for system control and monitoring
•
Analogue, AES3 and DanteTM audio inputs
•
Powerful grouping and multi‐layer EQ
•
Fully designed and engineered by Linea’s in‐house development team
•
Manufactured, tested, and supported entirely in the UK
Power per channel, all channels driven
At Linea Research you will find a company which is committed to designing and producing the finest audio
equipment in the world. Research and Development work is led by founder directors Ben Ver and Paul Williams who
share a distinguished 25‐year history at the top end of our industry. Together with the third founder, Davey Smalley
who incorporated Linea in 2003, they have successfully supplied tens of thousands of products to all corners of the
globe via OEM technical partners.
Linea Research products are now available under our own brand from a team of distribution partners who share a
passion for and commitment to high end audio engineering.
When you choose Linea Research you will be working with people who design the products, people who use the
products and above all, people who know pro audio and care about performance and quality.
General Specifications
Number of output channels
Four
Total power output, all channels driven
20,000, 10,000 and 6,00 Watts RMS
Audio inputs
4x Analogue, 2x AES3 and 4x Dante
Digital Signal Processing
High performance 96kHz DSP on all inputs and outputs
Control, monitoring and system status alarms
Ethernet network, RS232 & RS485
Volt‐free relay and contact closure ports. Heartbeat system health output
Power‐save modes
Standby after user defined time with fast wake up on audio
Deep ECO sleep after user defined time with wake up on command
System standby and wakeup
Network command, audio detection & contact closure
TM
(factory fitted option)
Power Output
Model
44 series C20
44 series C10
44 series C06
Power specification
RMS output power per channel, all channels driven with continuous program material
and a nominal ambient temperature of 40degC / 105degF
Crest Factor of 4 (12dB), 2‐Ohm nominal load
5,000W
2,500W
1,500W
Crest Factor of 2.8 (9dB), 4‐Ohm nominal load
3,000W
2,500W
1,500W
Crest Factor of 2 (6dB), 8‐Ohm nominal load
1,500W
1,500W
1,500W
Bridged, per channel pair, 4 Ohm load
10,000W
5,000W
3,000W
25V line (CV) operation, Crest Factor 4 (12dB)
1250W
885W
685W
70V line (CV) operation, Crest Factor 4 (12dB)
3500W
2,500W
1,500W
100V line (CV) operation, Crest Factor 4 (12dB)
5,000W
2,500W
1,500W
Audio Performance
Amplifier topology
Linea Research high performance Class D
Amplifier modulation scheme
Low feedback, multiple loop, with feed‐forward error correction
Dynamic range
Measured relative to the amplifier output
Analogue input, better than 113dBA typical
TM
AES / Dante input, better than 114dBA typical
Gain (with all the DSP level controls set to 0dB)
32dB
Frequency response, 4 Ohm load
<7Hz to >30kHz, 4 Ohms, ‐2.5dB points
Total harmonic distortion, THD
<0.05% typical, 1kHz signal, AES17 filter, 4 Ohm load
Inter‐channel crosstalk, worst case combination
better than ‐85dBr at 1kHz and ‐75dBr at 10kHz
Slew rate
>60V per microsecond typical
Damping factor (Ref 8 Ohms)
>800 at amplifier output (see Linea’s “Damping factor debunked” white paper)
Maximum analogue input level
+20dBu
Analogue input sensitivity range for full output
0dBu to +20dBu, continuously adjustable
Analogue input (four channels)
Input 20k Ohm, electronically balanced, link directly connected to input
Analogue ground scheme
AES48 standard compliant
AES3 input (two audio channels)
Transformer isolated with unique active cable equalisation for extended range
AES3 link (two audio channels)
Active AES3 signal regeneration. Automatic direct bypass to the AES3 input ensuring
the audio signal will still flow even when the amplifier is powered down
AES3 supported sampling rates
24kHz to 192kHz (auto locking)
Digital Signal Processing
Resolution
40 bit, Linea Research proprietary algorithms
Sample rate
96kHz throughout
Physical inputs to DSP drive modules
4x analogue, 2x AES & 4x Dante
Drive module input processing
Input signal routing, delay, gain, HPF, Phase, Mute
EQ: 2x low shelf, 6x PEQ / band pass and FIR shelving filters
Drive module output processing
Source, delay, gain, Phase, Mute, crossover filters, VX limiters
EQ: low shelf, 8x PEQ / band pass and shelving filters
Preset management
10 snapshots for device wide setup, 50 presets for loudspeaker settings
Presets can be recalled to sets of outputs or individual outputs as required
TM
inputs can be routed to four DSP drive modules
Unique high performance processing
Overlays
Twelve additional independent overlays of EQ, Delay and Gain
Flexible grouping for effective control of many amplifier channels in large systems
Class leading VX limiters
See the ‘speaker protection systems’ section
Hardman crossover filters
Better out of band rejection than Linkwitz‐Riley
LIR crossover filters
Unique Linear Phase alignments without the compromises of FIR filters
Power Supply
Topology (main power supply)
Linea Research high performance Series Resonant
Topology (auxiliary and standby supplies)
Low quiescent Eco‐Flyback
Internally stored energy
>600 Joules
Nominal mains input voltage range
85V to 240V, Power supply automatically detects voltage and configures accordingly
Mains input frequency range
47Hz to 63Hz
Mains inrush current (max for <10ms)
6A at 115V, 12A at 230V
Protections Systems
Under all circumstances the control and protection systems will endeavour to deliver the maximum power possible for a given set of
conditions, applying limiters only in extreme circumstances. Muting will only occur when a dangerous situation is detected, normal
operation automatically resuming when the condition clears.
System protection
Speaker protection
Excessive power supply current or amplifier output current
Sustained clipping prevention
Excessive temperature per sub system: PSU, amplifier and DSP
DC offset protection
Mains voltage within acceptable limits
Excessive HF energy (VHF) limiter
Internal power rails producing correct output
Fans operating at correct speed
VX audio output limiters
Power distribution protection systems
Vx provides a linear phase virtual crossover and two limiter paths on
each output. This unique system delivers effective protection for
systems that incorporate passive crossovers.
Vx Limit Multiband peak limiter, two per output
Mains inrush current limiting for soft start and anti‐surge
Vx Max
Multiband overshoot limiter, two per output
Mains average current limiting for mains breaker management
X‐Max
Driver excursion limiter
Randomised initialisation when remotely powered up
T‐Max
Driver thermal limiter (long term power limiter)
Monitoring, measurements recorded against time
Monitoring, device statistics and counters
Supply current
Number of power cycles counted
Supply voltage
Number of mains brownout events counted
Thermal Capacity
Fan speeds continuously monitored
Each driver current
Fan under‐speed events counted
Each driver impedance
Various protection mute events counted
Protection limiting for each output
Driver Impedance continuously monitored
An inbuilt notification system is provided that indicates problems to remote devices either via the network or the Volt‐free changeover
relay contacts accessible on the rear panel.
Physical
Cooling
Dual vari‐speed fans, front to back airflow. Washable, tool‐less change filter media.
Analogue IN and LINK
Phoenix
TM
pluggable terminal block (mating plug supplied)
AES3 IN and LINK
Phoenix
TM
pluggable terminal block (mating plug supplied)
Amplifier output
Neutrik Speakon
Mains input connector
Neutrik 32A Powercon
Dante Primary and Secondary
2x Shielded RJ45
Ethernet network
Shielded RJ45
RS232 and RS485
Phoenix
TM
pluggable terminal block (mating plug supplied)
Phoenix
TM
pluggable terminal block (mating plug supplied)
Contact closure inputs
Phoenix
TM
pluggable terminal block (mating plug supplied)
Front panel LED indicators
Per channel ‐ Input level, output level & status
Enclosure, all models
Standard 19” 2U (88mm), 357mm (14”) deep with handles and optional rear support
Net Weight
12.5kg (27.5 pounds).
Relay, ‘heatbeat’ outputs
TM
NL4 connectors
TM
For more information about the 44C series amplifiers or Linea’s other high performance audio products,
please contact us or your local dealer.
Linea Research Ltd
1 Marquis Business Centre
Royston Road
Baldock
Herts, U.K.
SG7 6XL
Tel: +44(0)1462 893 500
Email: info@linea‐research.co.uk
ZAP SA
Im Hölderli 26
8405 Winterthur
Tel: 052 232 37 80
email: [email protected]
www.zapaudio.com
www.linea‐research.co.uk
E&OE V1.0