Den stora Thomann Online-Rådgivaren: Choosing a PA System

6. Amplifiers

When the signal leaves the mixing desk, it is still at a very low voltage - far too low to drive loudspeakers. It’s the job of the amplifier to deliver the power required, and manage the resistance or ‘impedance’ between itself and the speakers connected to it.

The T.AMP D2800 digital amplifier

Professional sound specialists often use amplifiers with switch-mode power supplies – sometimes known as ‘digital’ amps. This makes the amplifiers themselves much lighter - essential if you are using several in a rack.

The T.AMP Proline 3000

However, for a small auditorium, or an up-and-coming gigging band, a good, powerful amplifier with a ‘Class A’ design is usually enough. But just how powerful should it be?

Amplifier output is best measured in Watts RMS - for more details of what this actually means, see our Power Amplifier Online Advisor. The same measure is also applied to loudspeakers - they are rated according to the number of Watts RMS they can accommodate without sustaining damage. As a rule of thumb, the power output of the amplifier should exceed the capacity of the speakers by about 30%, and you should budget for about 50% more power overall than you will actually need. This will allow you to get a big, rich, warm sound, without distortion, even at high volumes. Here's a rough guide to room sizes and likely power requirements:

Spoken word
or studio
50–100 people
room approximately 80-100sqm
(eg, entrance hall, gallery, small lecture theatre)
2x 100 Watt
small band
100–250 people
room approximately 200-400sqm
(eg, pub, club, small hall)
2x 300 – 500 Watt
medium halls
250–500 people
room approximately 800-1,000sqm
(eg, larger hall, marquee)
2x 1000 - 2000 Watt

Remember, these figures are only a rough guide. Ultimately, it’s down to your own judgement and taste to determine how much power you will need - but remember, it's not just about sheer volume. Clarity is more important that anything if you are going to impress your audience with your sound.

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Choosing a PA System översikt

Line6 Helix HX Effects Epiphone Joe Bonamassa 1958 "Amos" Bose T8S Mixer Zoom F1-LP Warm Audio WA73-EQ Decksaver NI Kontrol S49 MK2 Presonus Faderport 16 2box DrumIt Three Harley Benton PowerPlant ISO-1 Pro Fender Squier Standard Tele IL VB DAP-Audio Compact 8.1 Zoom F1-SP
Line6 Helix HX Effects

Multi effect pedal More than 100 HX effects, Of which up to 9 effects can be used simultaneously, Import of own Impulse Responses (IRS), Parallel stereo signal paths, Inputs can be switched between line / instrument level, Two assignable...

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Epiphone Joe Bonamassa 1958 "Amos"

Electric Guitar Joe Bonamassa model, Body and neck: Korina, Fretboard: Certified blackwood, Neck profile: 1958 Rounded C, 22 Medium jumbo frets, Pickups: Epiphone Probucker 2 (neck) and Epiphone Probucker 3 (bridge), Lock Tone ABR-1 Tuneomatic bridge, Including case, certificate,...

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Bose T8S Mixer

Tonematch Digital Stereo Mixer with 3-Band EQ Compact interface with 8 channels, Powerful DSP engine and intuitive control, Integrated Bose ToneMatch signal processing, Easy-to-read LED display and storable scenes, Inputs: 8 XLR / 6.35mm combo XLR, 2 AUX, USB...

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Zoom F1-LP

Field Recorder and Lavalier Microphone Set Two-channel audio recorder, Compatible with zoom microphone capsules, Supports WAV formats up to 24bit / 96kHz or MP3 formats on microSD / microSDHC card (up to 32GB), USB audio interface for PC and...

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Warm Audio WA73-EQ

Warm Audio WA73-EQ; 1-channel Mic-Preamp; British 1073-style; fully discrete Class A; Carnhill Transformers; 80dB of Gain (stepped gain switch); Tone Button (changes input transformer impedance); Polarity switch; +48v phantom power; Inductor based 3 band EQ: Low Band Boost/Cut (35, 60,...

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Decksaver NI Kontrol S49 MK2

Decksaver NI Kontrol S49 MK2, protects against dust, dirt, liquids and strikes, usable without deconecting cables, dimensions: (BxHxT): 84,5 x 30,0 x 4,0 cm, weight: 0,95 Kg

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Presonus Faderport 16

16-Channel DAW Production Controller 16 Professional, touch-sensitive 100 mm motor faders (Dual-Servo Drive Belt), High fader resolution: 10 Bits/1,024 steps, 85 Background and status illuminated buttons, 104 Controllable functions, 16 High-resolution LC displays as digital labeling fields, Timecode and...

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969 €
2box DrumIt Three

2box DrumIt Three e-drum module, 4GB disk space for samples, multilayer-sample-technology, metronome, songplayer, support a big amount of pads from different manufactures as well as triple-zone snare drum pads and up to three triple-zone cymbal pads, 15x stereo 1/4" jack...

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Harley Benton PowerPlant ISO-1 Pro

Multi-power adapter for effect pedals 8 isolated, filtered & short-circuit protected outputs eliminate noise and hum, High amperage for modern digital effects, LED monitoring at each output, Power supply with a 12V @ 2A DC power adapter (included), Output...

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Fender Squier Standard Tele IL VB

Electric guitar Body: Agathis, Neck: Maple, Fretboard: Indian Laurel (Laurel), Neck profile: C, Scale: 648 mm, Nut width: 42 mm, 22 Medium jumbo frets, Pickups: 2 Single coils, 6-Saddle strings-thru-body footbridge, Chrome hardware, Standard die cast mechanism, Colour: Vintage...

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277 €
DAP-Audio Compact 8.1

8-Channel Installation Mixer 8 Combined mic / line inputs (XLR / RCA), Master EQ with Mid Sweep, Phantom power, Selectable high pass filter, XLR master output (balanced), Headphone connector: 6.3 mm jack, Format: 19"/ 1U, Dimensions: 481 x 175...

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179 €
Zoom F1-SP

Field Recorder and Shotgun Microphone Two-channel audio recorder, Compatible with zoom microphone capsules, Supports WAV formats up to 24bit / 96kHz or MP3 formats on microSD / microSDHC card (up to 32GB), USB audio interface for PC and Mac...

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