Are amplifiers and power amplifiers the same thing?

In professional audio terminology, "amplifier" is a broad term that can refer to any device that increases signal level, including preamplifiers, integrated amplifiers and power amplifiers. A power amplifier specifically refers to the final amplification stage that drives loudspeakers, converting line-level signals into high-current output. In event technology, "power amplifier" and "endstufe" are used interchangeably to describe rack-mount units that power passive PA speakers. Integrated amplifiers combine preamplification and power amplification in one unit, while power amplifiers focus solely on delivering maximum output power with minimal distortion.

What exactly does a power amplifier do?

A power amplifier takes the low-voltage, low-current line-level signal from a mixing desk or DSP processor (typically 1–2 volts) and amplifies it to the high-voltage, high-current levels required to drive passive loudspeakers (often 20–100 volts or more). The amplifier's output stage uses transistors or MOSFETs to control large amounts of electrical power, converting it into the electromagnetic force that moves the loudspeaker's voice coil and cone. Professional power amplifiers also incorporate protection circuits, cooling systems and often DSP processing to ensure reliable, distortion-free performance. Without a power amplifier, passive loudspeakers cannot produce sound.

Which power amplifier is the best?

The "best" power amplifier depends entirely on your application, loudspeaker system and budget. For mobile PA applications, lightweight Class-D amplifiers from manufacturers such as LD Systems, DAP Audio or Skytec offer excellent power-to-weight ratios and efficiency. For fixed installations, models with DSP integration and network control from RCF, dB Technologies or JBL provide superior system management. For high-end touring, heavy-duty Class-AB or Class-H amplifiers deliver maximum sound quality and reliability. Always match amplifier power to your loudspeaker's RMS rating (aim for 1.5–2× speaker power), verify impedance compatibility and ensure the amplifier's feature set meets your operational requirements.

How much power should my amplifier have?

Professional power amplifiers should deliver 1.5 to 2 times the continuous (RMS) power rating of your loudspeakers at the specified impedance. For example, if your passive tops are rated at 500 watts RMS at 8 ohms, choose an amplifier that delivers 750–1000 watts per channel at 8 ohms. This headroom ensures clean, dynamic sound without clipping, particularly during transient peaks. Under-powering speakers can actually cause more damage than over-powering, as clipped signals from a struggling amplifier contain high-frequency distortion that can destroy tweeters. Always verify both the amplifier's power output and the loudspeaker's impedance to ensure safe, optimal matching.

What's the difference between stereo, parallel and bridged mode?

Stereo mode uses both channels of a 2-channel amplifier independently, typically driving left and right loudspeakers or separate tops and monitors. Parallel mode connects both channels to the same input signal, driving two identical loudspeakers with the same mono signal — useful for powering multiple stage monitors from one amplifier. Bridged mode (also called mono mode) combines both channels to drive a single loudspeaker with significantly higher power, typically doubling the output compared to stereo mode. Bridge mode is ideal for subwoofers or high-power tops, but requires a higher minimum impedance (usually 8 ohms) and may reduce damping factor. Always consult the amplifier's manual before using bridge mode.

What are good power amplifier brands?

Leading professional power amplifier brands include RCF, dB Technologies, JBL, LD Systems, DAP Audio, PSSO, Omnitronic, Monacor and Ram Audio. RCF and dB Technologies are renowned for high-end touring amplifiers with advanced DSP and network control. LD Systems offers excellent value for mobile applications, combining Class-D efficiency with robust construction. DAP Audio and PSSO provide reliable, cost-effective solutions for installations and rental companies. JBL and Omnitronic are trusted names with decades of experience in professional audio. At LTT, we stock amplifiers from all these manufacturers, ensuring you can find the perfect match for your system and budget.

Do I need a power amplifier if I have active speakers?

No — active speakers (also called powered speakers) have built-in amplifiers and do not require external power amplifiers. Active speakers receive line-level signals directly from a mixing desk and amplify them internally. Passive speakers, on the other hand, require an external power amplifier to function. The choice between active and passive systems depends on your application: active speakers are simpler to set up and ideal for mobile use, while passive systems with external amplifiers offer greater flexibility, easier maintenance and often superior sound quality in large installations. If you already own passive loudspeakers, you will need a dedicated power amplifier to drive them.

What cable do I need to connect a power amplifier to loudspeakers?

Use professional speaker cable with a minimum cross-sectional area of 2.5 mm² for cable runs up to 10 metres, and 4 mm² or larger for longer distances. The cable should be terminated with Speakon connectors (NL4 or NL2) for professional PA systems, as these provide secure, locking connections rated for high current. Alternatively, use heavy-duty binding posts or banana plugs for installation speakers. Never use standard instrument cables or microphone cables to connect amplifiers to loudspeakers — they are not designed for high current and will cause power loss, overheating and poor damping factor. Always match cable gauge to amplifier power and cable length to ensure optimal performance.

Amplifiers

LD Systems CURV 500 iAMP 4-Kanal Class D Installations Endstufe

LD Systems CURV 500 iAMP 4-Channel Class D Installation Amplifier

4 channels with DSP control • Purpose-designed for CURV-500 installations • Low-profile 1U 19" rackmount construction • Drives up to six CURV-500 satellites or one CURV-500...

€1,049.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio IA-270 Verstärker der Klasse D mit 2x 70 W an 4 Ohm

DAP-Audio IA-270 Class-D amplifier with 2x 70 W at 4 ohms

Compact design for fixed installations • Input forwarding switch for stereo and parallel mono modes • Individual 100-Hz high-pass filter for both inputs • Rear-side volume control...

€196.68 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio PA-380TU 80 W 100 V Amplifier Bluetooth 5.0, USB, Mikrofon (6,3 mm Klinke), AUX (RCA)

DAP-Audio PA-380TU 80 W 100 V Amplifier Bluetooth 5.0, USB, Microphone (6.3 mm jack), AUX (RCA)

80 W Mixer Amplifier • 100 V, 4-16 ohms • USB, DAB+/FM tuner, Bluetooth • 6.3 mm jack, XLR microphone and RCA input • Compact design • Control audio settings, like bass,...

€212.50 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC PKD-352 Class-D Studioverstärker

OMNITRONIC PKD-352 Class D Studio Amplifier

2-channel studio amplifier with SMPS, 2 x 175 W / 4 ohms, 2 x 100 W / 8 ohms Low weight and height due to integrated switch mode power supply • 2 operating modes can be selected (stereo or...

€189.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC MTC-4806 6-Channel Amplifier

Class D multi-channel PA amplifier with SMPS, 6 x 800 W RMS (4 ohms), 6 x 400 W RMS (8 ohms) Extremely low weight and height due to integrated switch mode power supply • 2 operating modes can...

€869.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC MTC-6408 8-Channel Amplifier

Class D multi-channel PA amplifier with SMPS, 8 x 800 W RMS (4 ohms), 8 x 400 W RMS (8 ohms) Extremely low weight and height due to integrated switch mode power supply • 2 operating modes can...

€999.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC XPA-350 MK2 Amplifier

Class AB PA amplifier with limiter, 2 x 175 W RMS (4 ohms), 2 x 130 W RMS (8 ohms) 2 level controls • Signal inputs via XLR or RCA connectors • Speaker outputs via lockable speaker jacks...

€199.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

PSSO DCA-12000 2-Channel SMPS Amplifier

Class I stereo PA amplifier with SMPS, 2 x max. 6000 W (2 ohms), 2 x max. 3900 W (4 ohms) Low weight and height due to integrated switch mode power supply • Reliable power amp with high...

€1,630.03 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC MTC-3204DSP 4-Kanal Endstufe mit DSP

OMNITRONIC MTC-3204DSP 4-Channel Amplifier with DSP

4-channel PA amplifier with DSP & SMPS, 4 x 800 W, 4 x 400 W Efficient Class D technology • Full configuration and real-time network communication via the built-in Ethernet interface...

€799.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

Power Dynamics WT460A Wifi Stereo 4-Kanal-Verstärker

Power Dynamics WT460A Wifi Stereo 4-Channel Amplifier

Experience wireless music streaming throughout your home or office with the WT460A compact powerful stereo amplifier. This innovative device can turn any pair of speakers into a wireless HiFi...

Express delivery possible

€219.90 *

incl. tax, free shipping to Germany
[International shipping costs]

Express delivery possible

Availability:

Delivery time: 1-3 days

Delivery time: 1-3 days

Power Dynamics PMP240 Kommerzieller Mixer-Verstärker 240W 6 Zonen

Power Dynamics PMP240 Commercial Mixer Amplifier 240W 6 zones

The PMP 6 Zones Mixer Amplifier is an all-in-one public address system suitable for various environments such as shops, factories, schools and hospitals. Its no-nonsense design and exceptional...

€659.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

Power Dynamics PMDA4500 4-Kanal Class-D-Verstärker 100V/8Ohm 4x 500W

Power Dynamics PMDA4500 4-Channel Class-D Amplifier 100V/8Ohm 4x 500W

The PMDA series is a range of 1U Class-D high power amplifiers with 4 outputs, each with separate volume controls. Powered by advanced switching power technology, these amplifiers stands out with...

€799.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio TA-4.750 4 x 750 W Touring-Verstärker mit DSP

DAP-Audio TA-4.750 4x 750 W touring amplifier with DSP

Compact (1U) and lightweight Class D touring amplifier • Lo-Z (2, 4, 8 ohms), stereo and bridge modes • DSP with 512 FIR filter taps and 8-band parametric EQ • Full control via IP...

€1,198.26 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio TA-4.1700 4 x 1700 W Touring-Verstärker mit DSP

DAP-Audio TA-4.1700 4x 1700 W touring amplifier with DSP

Compact (1U) and lightweight Class D touring amplifier • Lo-Z (2, 4, 8 ohms), Hi-Z (70 V), stereo and bridge modes • DSP with 512 FIR filter taps and 8-band parametric EQ • Full...

€1,601.54 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio TA-4.2600 4 x 2600 W Touring-Verstärker mit DSP

DAP-Audio TA-4.2600 4x 2600 W touring amplifier with DSP

Compact (1U) and lightweight Class D touring amplifier • Lo-Z (2, 4, 8 ohms), Hi-Z (70/100 V), stereo and bridge modes • DSP with 512 FIR filter taps and 8-band parametric EQ • Full...

€1,927.80 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio TA-4.3400 4 x 3400 W Touring-Verstärker mit DSP

DAP-Audio TA-4.3400 4x 3400 W touring amplifier with DSP

Compact (1U) and lightweight Class D touring amplifier • Lo-Z (2, 4, 8 ohms), Hi-Z (70/100 V), stereo and bridge modes • DSP with 512 FIR filter taps and 8-band parametric EQ • Full...

€2,108.68 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-2.750 2 x 750 W Verstärker zur Festinstallation

DAP-Audio SI-2.750 2x 750 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-2.750...

€439.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-2.1200 2 x 1200 W Verstärker zur Festinstallation

DAP-Audio SI-2.1200 2x 1200 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-2.1200...

€595.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-2.1800 2 x 1800 W Verstärker zur Festinstallation

DAP-Audio SI-2.1800 2x 1800 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-2.1800...

€680.68 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-4.450 4 x 450 W Verstärker zur Festinstallation

DAP-Audio SI-4.450 4x 450 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-4.450...

€537.88 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-4.700 4 x 700 W Verstärker zur Festinstallation

DAP-Audio SI-4.700 4x 700 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-4.700...

€659.46 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio SI-4.900 4 x 900 W Verstärker zur Festinstallation

DAP-Audio SI-4.900 4x 900 W install amplifier

Compact (1U) and lightweight Class D fixed installation amplifier • Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes • Universal SMPS (100 - 250 V AC) with PFC • The DAP SI-4.900...

€680.68 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

MONACOR PA-4125DX 4-Zonen-Multifunktions-Mischverstärker, 4 x 125 W, 2 x 250 W

MONACOR PA-4125DX 4-zone multifunctional mixing amplifier

4-zone multifunctional mixing amplifier, class D technology with DSP and professional features for general multi-room PA applications. Clearly arranged graphical user interface HTML5 with extensive...

€898.99 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC XPA-4804 MK2 Amplifier

Class D PA amplifier with limiter, 4 x 1800 W RMS (2 ohms), 4 x 1200 W RMS (4 ohms) 3 operating modes can be selected (stereo, parallel or bridged) • Input sensitivity adjustable • Level...

€649.00 *

incl. tax, free shipping to Germany
[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days