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6. Decibels

Musicians talk freely about decibels, but very few of them really understand what the term means. Many of them know that an increase in volume of one decibel is actually a very significant gain, but they don’t really know why. It’s worth discussing briefly, not least because it might save your hearing if you know just how loud 118dB SPL might actually be!

Decibel is a term most often used as a measure of sound pressure, though its true meaning is far more subtle. It actually describes a ratio - that is, the relationship between two different quantities - so there is actually no such thing as a definite decibel; it depends on how it is being used.

Decibels are used in electronics and optics, but it is their use in acoustics and sound pressure in particular that concerns us here – dB SPL. When measuring sound pressure, a decibel shows the relationship between the sound pressure and the specified measure of zero. Usually, zero is taken to represent the point at which a sound is inaudible to a human ear, which means that strictly speaking, one person’s decibel may be another person’s zero, depending on the quality of your hearing.

In fact, the zero from which most decibel measures are taken is usually set at around 20uPa, the normal lower end of the human audible range. Decibels make it easier to measure sound pressure because they are a logarithmic measure. If a simple measure was used, the figures would run into trillions - the decibel measure allows a more manageable way of expressing changes in sound pressure.

So how loud is loud? As we have seen, 130dB SPL is generally reckoned to be the pain threshold. Note however, that much lower levels can still be damaging, especially if they are sustained. Research in the field known as psycho-physics has shown that an increase of 10dB appears to equate to a doubling of volume for most people. So be careful when working with decibels - they are not a simple measure, and they jump much higher and more quickly than you may think.

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PA Speakers översikt

Alesis Vortex Wireless 2 Alesis Surge Mesh Kit Adam T5V Subpac M2X Roland R-07 black Yamaha Stagepas 600BT Arturia Minibrute 2 Focal Listen Professional Heritage Audio HA-73 EQ Elite Focal Shape Twin Sound Devices MixPre-3 Yamaha Stagepas 400BT
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Alesis Vortex Wireless 2

Alesis Vortex Wireless 2; USB/MIDI Keytar Controller with Accelerometer; Portable Performance Keyboard with Shoulder Strap, 37 touch sensitive keys with aftertouch; Eight touch sensitive RGB illuminated Performance Pads, Eight illuminated faders for volume or parameter control; Programmable tilt sensor with...

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266 €
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Alesis Surge Mesh Kit

E-Drum Set 385 Sounds, 40 kits, 60 songs, Additional input for a fourth tom and a second crash pad, 2 Master outputs 6.3 mm mono jack, Headphone output 3.5 mm stereo jack, Aux input 3.5mm stereo jack, MIDI input...

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609 €
(1)
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Adam T5V

Active Nearfield Monitor Equipped with: 5" woofer and 1.9" U-ART ribbon tweeter, 2x Class-D amplifiers: 50W RMS woofer, 20W RMS tweeter, Frequency range: 45 - 25000 Hz, Crossover frequency: 3 kHz, Maximum input level: 106 dB (1m/pair), Rear bass...

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169 €
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Subpac M2X

Subpac M2X, Mobile tactile bass system, SubPac adds real depth, connection and enjoyment to whatever you play through it - your music and media comes to life with the added dimension of physical bass. Frequency Response: 1hz-200hz, Wired Input: 3.5mm...

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399 €
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Roland R-07 black

Portable MP3 / WAV Recorder with Bluetooth Functionality Stereo recordings up to 24 Bit / 96 kHz in WAV format or up to 396 kbps in MP3 format on microSD / SDHC card, Built-in stereo microphone, Integrated hybrid limiter,...

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229 €
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Yamaha Stagepas 600BT

Mini-PA System with Bluetooth Function Consisting of 2x passive 2-way boxes and 10-channel power mixers, Power mixers and speaker cables can be stored in the boxes for transportation, Successor of the Stagepas 600i, Including 2 speaker cables, each 6...

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798 €
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Arturia Minibrute 2

Arturia Minibrute 2; analog semi-modular Synthesizer; Combination of classic and modular Synthesizer; 25 note Keyboard with Aftertouch; Brute-Oscillator; Steiner-Parker-Filter; additional Loop-Envelope; linear FM; Hardsync; two free assignable LFOs; integrated Step Sequencer; Arpeggiator; 48 point Patchbay; Pitch- and Modulation Wheel; Connections:...

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666 €
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Focal Listen Professional

Headphones Closed, Circumaural, Conversion technology for acoustic transparency and dynamics, Impedance: 32 ohms, Sensitivity (@ 1 kHz - / 1 Vrms): 122 dB SPL, THD (THD, @ 1 kHz / 100 dB SPL): 0.3%, Frequency range: 5 Hz to...

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248 €
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Heritage Audio HA-73 EQ Elite

Heritage Audio HA-73 EQ Elite; 1-Channel Mic-Preamp wit EQ; based on the 1073; hand wound Carnhill Transformers; 3 stage fully discrete class A mic preamp; max. Gain: 80 dB Mic and 50 dB Line; -20 dB Pad; LO-Z switches the...

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945 €
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Focal Shape Twin

Active Near Field Monitor Tweeter with low directivity for flexible listening position, Closed design with two passive membranes for easy installation near the wall, 2.5-Way concept for optimal control of the bass and lower mids, Optimal integration through extensive...

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845 €
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Sound Devices MixPre-3

Sound Devices MixPre-3; portable audio recorder with USB audio interface; 5 tracks: stereo mix + 3 isolated tracks; Kashmir microphone preamp with 76db gain; equivalent Input Noise: 128dBu max (A-weighting, gain=76dB, 150 Ohm source impedance); limiter per channel; low cut...

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775 €
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Yamaha Stagepas 400BT

Mini-PA System Bluetooth Function Consisting of 2x passive 2-way boxes and 8-channel power mixers, Power mixers and speaker cables can be stored in the boxes for transportation, Successor of the Stagepas 400i, Including 2 speaker cables, each 6 m...

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555 €
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