• Önskelista
  • se
    Välj din butik Select Store
    Alla länder All Countries
  • 0

Den stora Thomann Online-Rådgivaren: Choosing a PA System

8. Introduction to Acoustics

The bad news is that every room is different. The good news is that a basic introduction to the principles of acoustics should help you to solve most problems.

Sound waves prefer to travel in circles, like waves from a stone dropped into a pool. For PA purposes, this pattern is difficult to work with, so PA speaker cabinets are engineered to direct sound in more manageable ways. Essentially, they project out into the auditorium before the sound begins to disperse into its natural pattern.

It’s worth trying to determine how your speakers radiate their sound, so you can place them to maximum advantage. And be careful how you place them in relation to each other - the sound from one speaker can cancel out the sound from another.

The one factor over which you have very little control is the room itself. Glass, concrete and tiles are the enemy of good sound, because they reflect sound waves all over place. Short of carrying your own supply of very thick foam rubber to fix to the walls, there's not much you can do, though you should try to place the speakers to keep the damage to a minimum.

A ‘sound check’ is essential, but take nothing for granted - a lot changes once people come in. The audience does at least help to reduce the reflected sound, but it’s vital for everyone on stage, and the sound engineer, to take note of the way the sound has changed and adjust their settings accordingly – it’s normal to experience a substantial loss of high frequencies and reverb.

Your biggest challenge will come when playing in the open air. Sound waves lose their energy rapidly, so you will need a much more powerful system to cover a relatively small space.

Delay line

In larger rooms, a delay line may be required. This is a system that delivers the sound to the back of the hall. However, for listeners sitting mid-way between the front and the back, or at the sides, there is a risk that the two speaker sets will conflict, creating a noticeable echo. In a delay line, a time delay is built into the signal path, equivalent to the distance from the front speakers, to ensure that the sound is delivered consistently to all areas.

Line array

A typical line array

Larger venues need larger sound-reinforcement systems, with more square inches of cone to push the air. The trouble is, the more speakers you have, the greater the risk that some of their frequencies will cancel each other out, and you will actually end up with a worse sound than from a single speaker. ‘Line arrays’ are designed to combat this problem, and have become the standard for larger arenas and outdoor events. They are built using speaker modules with clearly defined beam angles - that is, the breadth of coverage of the air pushed out. By aligning these modules carefully with each other, you can actually build a single, cylinder-like column of sound in which all frequencies are transmitted without conflicting with each other. You can also distribute a full sound to a large and scattered audience of the kind you get at festivals. Unless you are a professional sound engineer, however, you are unlikely to have to concern yourself with the complexities of line arrays. By the time you're playing venues where they matter, you can leave it to the roadies to sort things out!

Din kontaktperson
PA
Tel +49-9546-9223-35
Fax +49-9546-9223-24
Hot Deals Beställ en gratis Hot Deal!

Över 8.250.000 musiker prenumererar redan på Thomann Hot Deals. Börja prenumerera gratis och få tillgång till mer än 400 aktuella erbjudanden!

ett Thomann-fan
Wie immer zuverläßig und unkompliziert. Weiter so !!!
okänd, 10.10.2014

Choosing a PA System översikt

Elektron Digitakt tc electronic Flashback 2 Delay Vox Adio Air GT Harley Benton HB-40B 2017 Harley Benton CST-24T Ocean Flame Millenium ST-95 Denon DN-300C MKII ADJ Pro Event Table tc electronic M100 Novation Circuit Mono Station Mooer Red Truck Vox AC2 Rhythm Bass
(4)
Rekommenderat
Elektron Digitakt

Digital Drum Machine 8 Internal audio tracks, 8 Dedicated MIDI tracks, 1 Multimode filter per audio track, 1 Assignable LFO per track, Delay and Reverb send effects, Built-in sequencer, Support for sampling, OLED display, 64 MB Sample memory, 1...

Till produkter
749 €
Rekommenderat
tc electronic Flashback 2 Delay

Effect Pedal for Electric Guitar Delay, The new TC MASH technology turns the foot switch into a pressure sensitive expression controller, New Ethereal Delay algorithm, For mono use, the stereo input can be used as a Tap Tempo input...

Till produkter
185 €
(5)
Rekommenderat
Vox Adio Air GT

Modelling Electric Guitar Combo Power: 50 W, Equipped with: 2x 3"speakers for a wide stereo sound, Bluetooth allows wireless playback of music and remote control via app, VET Modelling technology for authentic amp sounds, Up to 23 amplifier models,...

Till produkter
299 €
Rekommenderat
Harley Benton HB-40B 2017

Harley Benton HB-40B 2017, compact electric bass combo amplifier, 40 watt, 10" custom voiced speaker, TEC tube-emulating circuit, instrument input, gain control, integrated compressor with LED indicator, 3-band equalizer (bass, parametric middle, treble), volume control, headphone output, aux-input for play-along...

Till produkter
99 €
Rekommenderat
Harley Benton CST-24T Ocean Flame

Electric Guitar Deluxe series, Body: Mahogany, Top: Flamed maple, Set-in neck: Mahogany, Fretboard: Roseacer, 24 frets, Pearloid Dot fretboard inlays, Scale: 635 mm, Nut width: 42 mm, Pickups: 2 Wilkinson WHHB Alnico Open humbuckers, 1 Volume control, 1 Tone...

Till produkter
226 €
(1)
Rekommenderat
Millenium ST-95

Standing Aid Ideal for keyboardists, guitarists and DJs, Seat height, backrest and footrests individually adjustable, Seat upholstery and backrest with cover, Seat height adjustable from 545 - 965 mm, Padded seat, Weight: 6 kg, Material: Steel, Colour: Black, Suitable...

Till produkter
79 €
Rekommenderat
Denon DN-300C MKII

Denon DN-300C MK II, CD/USB Player, Slot-In CD - Drive, USB Audio Player, USB plays MP3 audio file formats, 3,5 mm Jack Input, Display, symmetric XLR Output, stereo RCA Output, adjustable speed ±15%, Random, Repeat and Power-on-Play, IR Remote, 10-key...

Till produkter
239 €
Rekommenderat
ADJ Pro Event Table

ADJ Pro Event Table, Compact and collapsible, Lightweight, around 18 kg, Functional and professional looking, table height: 880mm, dimensions table 1200x580mm; Dimensions (LxWxH): 50” x 24” x 45.5” / 1270 x 610 x 1155 mm, Dimensions for own Logo (WxH):...

Till produkter
325 €
Rekommenderat
tc electronic M100

tc electronic M100; Stereo Multi-Effects Processor; 16 TC-Effects including reverb, delay, chorus, flanger, phaser, rotary speaker, pitch shifter and multi-effects; Edit and Tap/Select function; 24-bit AD/DA converters; Stereo Input Level control with LED level indication; Mix Balance and Output Level...

Till produkter
111 €
Rekommenderat
Novation Circuit Mono Station

Paraphonic Analogue Synthesizer 2 Oscillators with individual control of sync and tuning parameters, Filter can be used as high, low or bandpass filters with 12 or 24 dB, Three distortion modes, Monophone and paraphone modes with individual glide control,...

Till produkter
522 €
(3)
Rekommenderat
Mooer Red Truck

Multi Effect Device for Electric Guitar 8 Effects in one housing: Boost, overdrive, distortion, tremolo, phaser, chorus/ flanger, delay, reverb, No menus, but controls for each parameter, Built-in tuner, Various routing options, Integrated speaker simulation, Separate footswitches for drive,...

Till produkter
249 €
Rekommenderat
Vox AC2 Rhythm Bass

Vox AC2 Rhythm Bass, Basscombo, 2x3" Speaker, 2 Watt, 5 effects, 3 selectable sounds normal flat and scoop, inputs for bassguitar and aux in, headphone output, 81 rhythm patterns, tempo 40-240 BPM, power supply via 6 AA batteries (alkaline or...

Till produkter
69 €
Feedback Har du hittat ett fel eller vill ge oss feedback om denna sida?

Vi ser fram emot att höra från dig och kommer att lösa eventuella problem så snart vi kan.

Lämna kommentar. Ange din e-postadress.