4 IN x 4 OUT

Hoellstern 4-channel audio amplifier

  • Pure power

  • All amplifier models deliver uncompromisingly high output powers between 8 kW and 30 kW. This allows to successfully realise all PA tasks in permanent installations and in the touring business. The extreme load stability ensures a clean control of 2-ohm loads. “Suitable“ and “capable“ don’t describe the force of these amplifiers exerted to drive loudspeakers in an audiophile way and control them dynamically.

  • Whether a cold start at -40 °C (-40 °F) in Russia or a searing 40 °C (105 °F) summer heat on the meadow – these amplifiers deliver a clean, audiophile and punchy amplification under all circumstances. Their high efficiency of up to 85 % and the no-compromise design from the aerospace and automotive industries deliver output powers and output currents that are without equal.

  • Super cool

  • Reliable

  • The high reliability has shown since 2004 with all kinds of sound reinforcement jobs. Whether in 2-ohm running mode on hardstyle techno trucks, at large festivals or smaller events with only one amplifier. With five models an integrative material pool can be defined and managed in an economically optimal way in the rental and touring business. With two inputs and outputs the amps are very well suited for all applications.

  • The continuously growing K2 loudspeaker library with currently 520 presets and 300 internal DSP memory locations ensures a maximum and worldwide unique flexibility. The amplifiers are the platform for all loudspeakers worldwide. Just like the amps, the K2 loudspeaker libraries are designed with utmost precision.

  • Flexible

  • Compact

  • The compact construction with 2 height units and 30 cm (12 in.) in depth, has a possibly record-breaking compactness and a surprisingly low weight of 12 kg (26.5 lbs.). With its many insert nuts and high-strength screws including locking varnish, the robust sheet steel housing is exemplary for the legendary quality of the Hoellstern amplifiers.

  • A 5-year warranty and a guaranteed production in Germany are an essential part of our product philosophy.

    There are many more benefits that are worth mentioning, but watch out: the motto “hearing is believing“ is true. A qualified A/B check says more than a 1000 words.

  • 5 years warranty

Models

Engineered and made in Germany

Amplifier 8 Ohm 4 Ohm 2.7 Ohm 2 Ohm 1 Ohm Bridged
Hoellstern 20.4 2,200 W 4,400 W 6,300 W 8,000 W 16,000 W
Hoellstern 14.4 1,300 W 2,600 W 3,800 W 5,000 W 10,000 W
Hoellstern 13.4 1,300 W 2,600 W 3,800 W 3,400 W
MODE:OFF
7,600 W
Hoellstern 12.4  600 W 1,150 W 1,700 W 2,200 W 4,400 W 8,000 W

What our customers say

We prefer to let those do the talking who rely on us …

  • Well, I was floored and all others were too. Unbelievable, listening to loud music is nothing but fun! Your limiters do very precisely just what they are physically supposed to do.

    Technical supervisorClub in Berlin
  • We did an A/B shootout to compare the power consumption of the Delta 14.4 with other digital power amps. Hoellstern has a much better power management!

    Technical service providerBayreuth

Specifications

Facts, facts, facts

General information

  • All models feature the same high component quality
  • All models play on the same high level of sound quality
  • 4 XLR all-metal female sockets plus 4 XLR all-metal male sockets for slave operation
  • 4 SpeakON sockets in high-current version and twofold thick-copper PCB
  • 1 PowerCon AC mains input with fully active power factor correction (PFC), virtually no reactive power on the AC grid
  • AC mains input, actively monitored
  • Operational from 80 V to 250 V AC
  • Longterm power consumption limited to 16A rms (16 B automatic circuit breaker)
  • Dynamic power consumption of up to 48 A
  • Very high efficiency of up to 85 %
  • Massive heatsinks, screwed directly onto the steel housing
  • Extremely high thermal stability for toughest operating conditions
  • Power supply with extremely large energy buffer
  • Massive output stages with a max. current output capability of 125 A per channel
  • Output blocks with 8-layer thick copper PCBs
  • Super high-grade fans with a service life of > 250,000 hours at +40 °C
  • Minimum allowable turn-on temperature: -40 °C, thus suitable for all seasons and climate zones
  • PCBs sealed against moisture, dew formation and aggressive substances
  • 2U 19″ rack enclosure, only 30 cm (12 in.) deep and weighing only 12 kg (26 lbs.) for light and compact racks
  • Rugged sheet steel construction
  • Ideally suited for touring business and permanent installations
  • 5 years warranty with guaranteed production in Germany

General specifications

Number of individual inputs 4
Number of individual outputs 4
THD at 1 kHz at 4 ohms and -3 dB < 0.03 %
Frequency response 20 Hz to 20 kHz at 8 ohms at -15 dB + / – 0.5 dB (typically + / – 0.05 dB)
Damping factor at 8 ohms, 100 Hz > 1000, typically 1500 comprising the SpeakON® connectors, typ. 5 mOhms
Latency without DSP or bypass (connector to connector) 0.000 ms, ZeroLatency™ technology
Signal limiter Yes
Current monitoring Yes
LF limiter Yes, reduces the gain gently
HF limiter Yes, reduces the gain gently
AC mains supply monitoring /
Power management
Yes
Rearmounted gain factor toggle switch 26 dB and 32 dB basic gain
Frontmounted rotary gain controls 0 dB to – 100 dB, digitally controlled
Rearmounted bridge mode switch Channel 1 and 2: Yes / Channel 3 and 4: Yes
AC mains supply input 1 x Neutrik® PowerCON®
Analogue input and slave connectors 4 x 3-pin Neutrik® full metal socket and 4 x 3-pin Neutrik® full metal plug
Amplifier output connectors 4 x 4-pin high current Neutrik® SpeakON®
Remote control network Yes, D-Sub 9 socket, RS-485 network, RS-232 point-to-point, Hoellstern® protocol
Frontside status LEDs display Standby, Signal Input, VU -6 dB, VU -3 dB , VU 0 dB and Signal Limit
Frontside error LEDs display Current, HF / LF Limiter, Temperature
Frontside rotary controls One rotary step control with digital sensing per channel
Frontside switches Standby / ON switch, software-controlled
AC mains input 180 VAC to 265 VAC, operative from 70 VAC, 400 V tolerant
Starting current 10 A softstart
Intelligent AC mains power management Yes, iCVP® technology, dual hard-regulated switching power supply
Efficiency Up to 84 % (AC mains input to audio output)
AC mains fusing 16 A (class B breaker), for personal alarm systems class C circuit breaker or better
Housing construction Black powder-coated steel body , anodised aluminium front panel
Handles and 19″ rack ears Yes, anodised aluminium, replaceable
Air filter and grids Open-pore foam, spring steel grids, black powder-coated, vacuum-cleanable
Air rate and fans 3 fans, temperature-controlled speed, front sucking
Dimensions Width: 19″ (483 mm), height: 2 RU (88 mm), overall depth: 290 mm from rack ears
Weight 12 kg (26 lbs), shipping weight 14 kg (30 lbs)

20.4

Output voltagepeak > 190 V
Output current cut-out limitpeak (with 5 retries) > 115 A
Output powers and permissible nominal loads Output C1 Output C2 Output C3 Output C4
8 ohm (Bridgeable)
2,200 W 2,200 W 2,200 W 2,200 W
4 ohm (Bridgeable)
4,400 W 4,400 W 4,400 W 4,400 W
2.7 ohm > 6,000 W 1) > 6,000 W 1) > 6,000 W 1) > 6,000 W 1)
2.0 ohm > 8,000 W 1) > 8,000 W 1) > 8,000 W 1) > 8,000 W 1)
1.6 ohm (only for information – 2 ohm minus 20 %) > 10,000 W 1) > 10,000 W 1) > 10,000 W 1) > 10,000 W 1)

1) Each channel provides individually considered extremely high, load stableperformance at nominal impedances down to 2 ohms. The total power of all four channels is at practical burst signals typically 20 kW (40 kW for a short time). Will be permanently accessed more power than the power supply (mains and supply) can provide, so the hardware limiter will reduce the output levels. The hardware limiter should not be used as a signal compressor. It is up to the user to properly deal with the available power pool.

14.4

Output voltagepeak 145 V, all outputs, mode: ON |ON and ON |OFF
Output current cut-out limitpeak (with 5 retries) Mode ON | ON: Ch 1: 100 A, Ch 2: 100 A, Ch 3: 50 A, Ch 4: 50 A
Output powers and permissible nominal loads Output C1 Output C2 Output C3 Output C4
Mode: ON|ON, 8 ohm
(Bridge1: 8 ohm | 8 ohm)
1,300 W (5,200 W)
1,300 W
1,300 W (5,200 W)
1,300 W
Mode: ON|ON, 4 ohm
(Bridge1: 4 ohm | 8 ohm )
2,600 W (10,400 W)
2,600 W
2,600 W (5,200 W)
2,600 W
Mode: ON|ON, 2.7 ohm
3,800 W
3,800 W
2,500 W @ 4 ohm
2,500 W @ 4 ohm
Mode: ON|ON, 2.0 ohm
5,000 W
5,000 W
2,500 W @ 4 ohm
2,500 W @ 4 ohm
Mode: ON|OFF, 8 ohm
(Bridge1: 8 ohm | 8 ohm )
1,300 W (5,200 W)
1,300 W
1,300 W (5,200 W)
1,300 W
Mode: ON|OFF, 4 ohm
(Bridge1: 5.4 ohm | 5.4 ohm )
2,600 W (7,600 W)
2,600 W
2,600 W (7,600 W)
2,600 W
Mode: ON|OFF, 2.7 ohm
3,800 W
3,800 W
3,800 W
3,800 W
Mode: OFF|ON, 8 ohm
(Bridge1: 8 ohm | 8 ohm)
1,000 W (4,000 W)
1,000 W
1,000 W (4,000 W)
1,000 W
Mode: OFF|ON, 4 ohm
(Bridge1: 4 ohm | 5.4 ohm)
2,000 W (8,000 W)
2,000 W
2,000 W (6,000 W)
2,000 W
Mode: OFF|ON, 2.7 ohm
3,000 W
3,000 W
3,000 W
3,000 W
Mode: OFF|ON, 2.0 ohm
4,000 W
4,000 W
3,000 W @ 2.7 ohm
3,000 W @ 2.7 ohm
Mode: OFF|OFF, 8 ohm
(Bridge1: 8 ohm | 8 ohm)
850 W (3,400 W)
850 W
850 W (3,400 W)
850 W
Mode: OFF|OFF, 4 ohm
(Bridge1: 4 ohm | 4 ohm)
1,700 W (6,800 W)
1,700 W
1,700 W (6,800 W)
1,700 W
Mode: OFF|OFF, 2.7 ohm
2,500 W
2,500 W
2,500 W
2,500 W
Mode: OFF|OFF, 2.0 ohm
3,400 W
3,400 W
3,400 W
3,400 W

1) DELTA14.4(-DSP): Bridge mode of channel C34 switchable by software Konfigurator2™ only.

13.4

Output voltagepeak Mode ON, all outputs: 145 V / Mode OFF, all outputs: 120 V
Output current cut-out limitpeak (with 5 retries) Mode ON, all outputs: 68 A / Mode OFF, all outputs: 75 A
Output powers and permissible nominal loads Output C1 Output C2 Output C3 Output C4
Mode: ON, 8 ohm
(Bridge: 8 ohm | 8 ohm)
1,300 W (5,200 W)
1,300 W
1,300 W (5,200 W)
1,300 W
Mode: ON, 4 ohm
(Bridge: 5.4 ohm | 5,4 Ohm)
2,600 W (7,600 W)
2,600 W
2,600 W (7,600 W)
2,600 W
Mode: ON, 2.7 ohm
3,800 W
3,800 W
3,800 W
3,800 W
Mode: OFF, 8 ohm
(Bridge: 8 ohm | 8 Ohm)
850 W (3,400 W)
850 W
850 W (3,400 W)
850 W
Mode: OFF, 4 ohm
(Bridge: 4 ohm | 4 Ohm)
1,700 W (6,800 W)
1,700 W
1,700 W (6,800 W)
1,700 W
Mode: OFF, 2.7 ohm
2,500 W
2,500 W
2,500 W
2,500 W
Mode: OFF, 2.0 ohm
3,400 W
3,400 W
3,400 W
3,400 W

12.4

Output voltagepeak 95 V, all outputs, mode: ASYM
Output current cut-out limitpeak (with 5 retries) Mode ASYM: Ch 1: 120 A, Ch 2: 120 A, Ch 3: 70 A, Ch 4: 70 A
Output powers and permissible nominal loads Output C1 Output C2 Output C3 Output C4
Mode: ASYM, 8 ohm
600 W 600 W 600 W 600 W
Mode: ASYM, 4 ohm
1,150 W 1,150 W 1,150 W 1,150 W
Mode: ASYM, 2.7 ohm
1,700 W 1,700 W 1,700 W 1,700 W
Mode: ASYM, 2 ohm
(Bridge: 2 ohm | 3.2 ohm)
2,200 W (8,000 W) 2,200 W 2,200 W (5,000 W) 2,200 W
Mode: ASYM, 1.6 ohm
2,700 W 2,700 W 2,700 W 2,700 W
Mode: ASYM, 1 ohm
4,000 W 4,000 W 2,700 W @ 1.6 ohm 2,700 W @ 1.6 ohm
1 ohm mode: 8 ohm
400 W 400 W 400 W 400 W
1 ohm mode: 4 ohm
800 W 800 W 800 W 800 W
1 ohm mode: 2,7 ohm
1,200 W 1,200 W 1,200 W 1,200 W
1 ohm mode: 2 ohm
(Bridge: 2 ohm | 2 ohm)
1,600 W (6,400 W) 1,600 W 1,600 W (6,400 W) 1,600 W
1 ohm mode: 1.6 ohm
2,000 W 2,000 W 2,000 W 2,000 W
1 ohm mode: 1 ohm
3,000 W 3,000 W 3,000 W 3,000 W
1 ohm mode: Bridge, 1.6 ohm
8,000 W (for information only) 8,000 W (for information only)