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

OMNITRONIC A-3603 Class-D 2.1 Amplifier

Powerful 3-channel amplifier - for classic 2.1 applications with two top and one sub speakerThe A-3603 produces enough power to supply large speaker system with up to a maximum of 3600 watts, 4...

€699.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC EP-220PR Vorverstärker mit MP3-Player und FM-Radio

OMNITRONIC EP-220PR Preamplifier with MP3 Player and FM Radio

Universal 19" preamplifier with audio player, Bluetooth and FM radio Built-in audio player with Bluetooth receiver • SD card slot and USB port • 5 stereo line inputs • 4 RCA L/R...

€119.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC EPA-100BT Mixing Amplifier

The 1 U flat stereo mixing amplifier EPA-100BT with efficient class D output circuitry is particularly suitable for permanent installations in restaurants, gyms and retail locations which require...

€149.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

OMNITRONIC DJP-900NET Class-D Verstärker mit Internetradio

OMNITRONIC DJP-900NET Class D Amplifier with Internet Radio

Stereo receiver with internet radio, DAB+, Bluetooth, 2 x 460 W / 4 ohmsWith the flat stereo receiver DJP-900NET, you receive high-quality net radio from thousands of free radio stations around the...

€385.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

PSSO DDA-1700 Amplifier

Stereo PA amplifiers with up to 3.5kW of powerThe stereo PA amplifiers of the DDA series with integrated limiter have been specially designed for stage and the disco applications. The amplifiers...

€449.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

PSSO QDA-4400 4-Channel Amplifier

4-channel PA amplifier with 5kW of powerThe QDA-4400 PA amplifier offers ultra-high output power paired with a low weight and small overall height. The amplifier uses a Class D output circuitry....

€799.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio HP-500 - 2HE 2x200 W Verstärker

DAP-Audio HP-500 2x 200 W amplifier

Class AB amplifier • Efficient forced air cooling • Bridge, parallel and stereo mode • Full protection circuits • 19" / 2U design • Rubber feet and power cable...

€315.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio HP-900 - 2HE, 2x 450 W Verstärker

DAP-Audio HP-900 2x 450 W amplifier

Class AB amplifier • Efficient forced air cooling • Bridge, parallel and stereo mode • Full protection circuits • 19" / 2U design • Rubber feet and power cable...

€395.00 *

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Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio HP-1500 - 2HE, 2x 750 W Verstärker

DAP-Audio HP-1500 2x 750 W amplifier

Class H amplifier • Efficient forced air cooling • Bridge, parallel and stereo mode • Full protection circuits • 19" / 2U design • Rubber feet and power cable included...

€435.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio HP-3000 - 2HE, 2x 1400 W Verstärker

DAP-Audio HP-3000 2x 1400 W amplifier

Class H amplifier • Efficient forced air cooling • Bridge, parallel and stereo mode • Full protection circuits • 19" / 2U design • Rubber feet and power cable included...

€519.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio CA-2150 - Kompakter 2-Kanal-Verstärker

DAP-Audio CA-2150 Compact 2-channel amplifier (2x 150 W)

Class D amp, SMPT and Soft Start technology • Advanced protection circuits and indicator LEDs • Stereo and bridge mode • 1U suitable for 19" rack • The DAP CA-2150 is a 2x...

€249.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio CA-4150 - Kompakter 4-Kanal-Verstärker

DAP-Audio CA-4150 Compact 4-channel amplifier (4x 150 W)

Configurable built-in crossover for top-sub combination • Class D amp, SMPT and Soft Start technology • Advanced protection circuits and indicator LEDs • Stereo and bridge mode...

€435.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio PA-7120 - Verstärker, 120 W 100 V

DAP-Audio PA-7120 4-channel 120 W 100 V Mixer Amplifier

Suitable for low/high impedance speakers (100 V/1x 8Ω) • 3x RCA and 1x Mini-Jack input • 3 microphone inputs with phantom power and speech filter • 'call only' zone...

€425.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio ZA-7250 - Zonen-Verstärker mit 250 W und 100 V

DAP-Audio ZA-7250 250 W 100 V 4-Zone Mixer Amplifier

4 stereo inputs & 3 mic inputs • Line-output per zone & special output for only music/mics • Chime & Ducking • Loop-through connection • 19" 2U rack design...

€553.68 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio PA-250 - Verstärker, 250 W 100 V

DAP-Audio PA-250 250 W 100 V Mono Amplifier

Suitable for low/high impedance speakers (100 V/1x 8Ω) • Loop through connection • 24 V back up power input • 19" 2U rack design • Power cable and green terminal...

€437.99 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

DAP-Audio PA-500 - Verstärker, 500 W 100 V

DAP-Audio PA-500 500 W 100 V Mono Amplifier

500 W RMS • Loop through connection • RCA, XLR, Terminal input • 24 V Back up power input • The DAP PA-500 is a 500 watt, 100 V plain amplifier. It is a reliable work horse that...

€560.29 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

LD Systems DEEP2 2400 X PA Endstufe 2 x 1200 W 2 Ohm

LD Systems DEEP2 2400 X - PA Power Amplifier 2 x 1200 W 2 ohm

PA Power Amplifier 2 x 1200 W 2 ohm The DP2400X is the newest member of the DEEP2 family of power amplifiers. In response to requests by many customers, we expanded this series with a new, powerful...

€719.00 *

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Near-term available
Delivery time: approx. 1 week

Delivery time: approx. 1 week

LD Systems XS 700 PA Endstufe Class D 2 x 350 W 4 Ohm

LD Systems XS 700 - PA Power Amplifier Class D 2 x 350 W 4 Ohms

PA Power Amplifier Class D 2 x 350 W 4 Ohms LD Systems XS700 Power Amplifier The XS700 is the flagship of the XS series of power amplifiers and an absolute flyweight with just 1U and 3.4kg. Our...

€355.00 *

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Near-term available
Delivery time: approx. 1 week

Delivery time: approx. 1 week

MONACOR PA-6040MPX 4-Zonen Vorverstaerker

MONACOR PA-6040MPX 4-zone mixer

4-zone mixer, for general multi-room PA applications. 4 zones with user-defined routing of all input channels • 4 inputs microphone/line via comb. jacks • 2 inputs line stereo via RCA...

€638.99 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

IMG STAGE LINE STA-2000D Digitalverstaerker

IMG STAGELINE STA-2000D 4-channel class D PA amplifier, 2,400 W

The new generation of class D PA amplifiers from IMG STAGELINE impresses with a high power capability and high energy efficiency. Other features include a silent operation and a low weight which...

€1,159.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

MONACOR AKB-160DT PA amplifier module with integrated Dante® module

Let's stream ... The well-known and reliable amplifier systems PA-900 and AKB-160 now feature a 2-channel Dante® module which turns them into Dante® instreamers for versatile applications....

€593.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

MONACOR PA-900DT Mono PA mixing amplifier with integrated Dante® module

Let's stream ... The well-known and reliable amplifier systems PA-900 and AKB-160 now feature a 2-channel Dante® module which turns them into Dante® instreamers for versatile applications....

€772.00 *

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Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days

MONACOR PA-948 Mono PA mixing amplifier

Mono PA mixing amplifier 1 x 480 W • 4 balanced microphone inputs and line inputs with selectable priority • 4 stereo line inputs • Speaker outputs via screw terminal contacts...

€950.00 *

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Delivery time: 3-5 days

Delivery time: 3-5 days

MONACOR SA-130DMP Stereo amplifier, 140 W

Stereo amplifier, 140 W, with integrated MP3 player, Bluetooth receiver, FM radio and USB interface. Bluetooth receiver for wireless connection of laptops, smartphones or tablet PCs • USB...

€349.48 *

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[International shipping costs]

Availability:

Delivery time: 3-5 days

Delivery time: 3-5 days