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

Ram Audio SB 3K - PowerPack Module SB 3K

PowerPack Module SB 3K DSP_PowerPack is the integral solution given by RAM Audio to the needs of many acoustic enclosures manufacturers when it comes to self-powering their products. RAM Audio...

€1,125.40 *

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Ram Audio SB 6K BI - PowerPack Module SB 6K Bi

PowerPack Module SB 6K Bi DSP_PowerPack is the integral solution given by RAM Audio to the needs of many acoustic enclosures manufacturers when it comes to self-powering their products. RAM Audio...

€1,419.50 *

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Ram Audio SB 6K TRI - PowerPack Module SB 6K Tri

PowerPack Module SB 6K Tri DSP_PowerPack is the integral solution given by RAM Audio to the needs of many acoustic enclosures manufacturers when it comes to self-powering their products. RAM Audio...

€1,632.00 *

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Ram Audio XTR-12K - PA Amplifier 2 x 6000 W 4 Ohm

PA Amplifier 2 x 6000 W 4 Ohm Dual PFC QuantaPulse™ Regulated SMPS • Max. Output: 270V / 70A peak • Dedicated design for powerful subwoofers • 32/38/44 dB selectable Gain...

€3,899.00 *

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Ram Audio XTR-18K - PA Amplifier 2 x 9000 W 4 Ohm

PA Amplifier 2 x 9000 W 4 Ohm Dual PFC QuantaPulse™ Regulated SMPS • Max. Output: 270V / 70A peak • Dedicated design for powerful subwoofers • 32/38/44 dB selectable Gain...

€4,775.75 *

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Ram Audio AS 1K5 - PowerPack Modul AS 1K5

PowerPack Modul AS 1K5 DSP_PowerPack is the integral solution given by RAM Audio to the needs of many acoustic enclosures manufacturers when it comes to self-powering their products. RAM Audio...

€899.00 *

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Ram Audio AS 2K3 - PowerPack Modul AS 2K3

PowerPack Modul AS 2K3 DSP_PowerPack is the integral solution given by RAM Audio to the needs of many acoustic enclosures manufacturers when it comes to self-powering their products. RAM Audio...

€989.00 *

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OMNITRONIC CPE-40P PA Mixing Amplifier

PA mixing amplifier with audio player,IR remote control and Bluetooth, 40 W RMS SD card slot and USB port • FM tuner with auto scan • 3 microphone inputs with separate level controls...

€119.00 *

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Skytec SPL 400 Verstärker 2x 200W Schwarz

Skytec SPL 400 Amplifier 2x 200W Black

This SPL 2x 200W amplifier has separated volume controls and a clipping indicator for each channel. The peak limiter prevents overloading in order to produce a perfect sound. It uses the latest...

€99.95 *

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Skytec SPL 700 Amplifier 2x 350W EQ

A 2x 350W amplifier with built-in 3-Band equalizer which should not be missing in any DJ installation. The amplifier has several stereo RCA inputs for television, CD- & DVD player, Tuner etc.....

€119.95 *

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Skytec SPL 1000 Amplifier 2x 500W EQ

A 2x 500W amplifier with built-in 3-Band equalizer which should not be missing in any DJ installation. The amplifier has several stereo RCA inputs for television, CD- & DVD player, Tuner etc.....

€129.95 *

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Skytronic AV400 Stereo-Verstärker Silber

Skytronic AV400 Stereo Amplifier Silver

The AV400 is a classically styled stereo amplifier in chic aluminium design. This 2x 200W versatile amplifier is equipped with auxiliary inputs for DVD, CD, Tuner and other music sources. Separate...

€69.90 *

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Ram Audio MDi4-6K D BS/P - 4 Kanal Verstärker 4 x 1500W 4 Ohm + Dante

Ram Audio MDi4-6K D BS/P - 4 Channel Amplifier 4 x 1500W 4 Ohm and Dante

4 Channel Amplifier 4 x 1500W 4 Ohm and Dante MDi Series is the newest solution from RAM Audio for fixed installations, where state-of-the-art amplification technology has been used to manage...

€3,183.25 *

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Ram Audio ZETTA 460 - PA Endstufe 4 x 1450W 2 Ohm

Ram Audio ZETTA 460 - PA Amplifier 4 x 1450W 2 Ohm

PA Amplifier 4 x 1450W 2 Ohm Unmatched audio quality hi efficiency Class H design • 2/4 Channels models from 1000W up to 10000W • Ultra light weight 6kg, compact package 25cm deep...

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OMNITRONIC DJP-604 4-Kanal Class-D Endstufe

OMNITRONIC DJP-604 4-Channel Class D Amplifier

4-channel class D amplifier in 9.5" housing, 4 x 150 W / 4 ohms, 4 x 80 W / 8 ohms Extremely low weight and height due to integrated switch mode power supply • Level control per channel...

€349.00 *

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OMNITRONIC DJP-900P MK2 Class-D Verstärker

OMNITRONIC DJP-900P MK2 Class D Amplifier

The compact stereo mixing amplifier DJP-900P with efficient class D output circuitry is particularly suitable for permanent installations in restaurants, gyms and retail locations which require...

€299.00 *

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Skytec SPL 1000MP3-Verstärker blaue LED + EQ Schwarz

Skytec SPL 1000MP3 Amplifier blue LED + EQ Black

This 2x 500W amplifier should not be missing in any DJ setup. With built-in MP3 player, playing in a simple way MP3 music from USB stick or SD card. Blue LED illuminated modern front panel. The...

€149.95 *

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OMNITRONIC MCD-2004 MK2 4-Kanal-Installationsendstufe

OMNITRONIC MCD-2004 MK2 4-Channel Installation Amplifier

Class D multi-channel PA amplifier with SMPS, 4 x 500 W RMS (4 ohms), 4 x 250 W RMS (8 ohms) PA amplifier with integrated limiter for multi-zone applications • Signal inputs via balanced XLR...

€499.00 *

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Audizio AD200B 2-Kanal HiFi-Verstärker Schwarz

Audizio AD200B 2-Channel HiFi Amplifier Black

The Audizio AD series is a series of versatile HiFi amplifiers with great functionality and excellent sound. Even at higher volume levels these amplifiers provides a high sound pressure. The...

€119.90 *

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Audizio AD220B 2-Kanal-HiFi-Verstärker Schwarz

Audizio AD220B 2-Channel HiFi Amplifier Black

The Audizio AD series is a series of versatile HiFi amplifiers with great functionality and excellent sound. Even at higher volume levels these amplifiers provides a high sound pressure. The...

€134.90 *

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Power Dynamics PMDA4120 4-Kanal Class-D-Verstärker 100V/8Ohm 4x 120W

Power Dynamics PMDA4120 4-Channel Class-D Amplifier 100V/8Ohm 4x 120W

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...

€599.00 *

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Power Dynamics PMDA4240 4-Kanal Class-D-Verstärker 100V/8Ohm 4x 240W

Power Dynamics PMDA4240 4-Channel Class-D Amplifier 100V/8Ohm 4x 240W

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...

€699.00 *

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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 *

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