Den stora Thomann Online-Rådgivaren: Ribbon Microphones

3. Working Principle

The Dynamic Principle

Ribbons belong to the category of dynamic microphones. Dynamic microphones are passive, i.e. they don’t require a power supply. The most common form of the dynamic microphone is the moving coil microphone. The ever popular Shure SM58, for instance, is a moving coil mic, as are many, many other stage microphones. Moving coil mics are similar to loudspeakers: There’s a coil affixed to the backside of a diaphragm, and this coil is surrounded by a magnet. When sound waves hit the diaphragm, the coil begins to move in its magnetic gap. This movement inside the magnetic field produces a small current in the coil that is in direct relation to the sound waves. And that’s exactly what a microphone is supposed to do: sound is turned into a small voltage, an electrical signal. If we take that voltage, amplify it and feed it to a loudspeaker, which, as has been said, is constructed very similarly, the exact opposite is going to happen: our electrical signal is turned into sound again. Ah, the wonders of technology!

The Ribbon Microphone in Particular

The ribbon microphone uses essentially the same working principle, but is far more delicate – both in sound and construction. One drawback of the moving coil microphone is that there is a relatively high mass that has to be moved by the sound waves. The diaphragm is relatively thick and has to bear a copper wire coil on its back. Instead of a diaphragm, the ribbon microphone merely uses an ultra-thin aluminium ribbon. This very light strip of aluminium is placed between two magnet poles. If sound waves hit the ribbon, it moves to their rhythm and a very, very small electric current is produced inside the ribbon. So there’s a good thing and a bad thing: on the one hand, the ribbon is incredibly light and can follow the sound waves very accurately, much more so than the heavy moving coil mic. But on the other hand, the amount of energy created is incredibly low. Too low, actually, to drive a microphone preamp.

Ribbon Mics Use Transformers

That’s why a ribbon microphone always includes a transformer. A transformer is basically just two coils in close proximity. If you feed an AC voltage (which is what the ribbon element produces) to the primary coil, you get an AC voltage on the secondary coil that looks (i.e. sounds) exactly like the one on the input. That’s pretty boring, so far. But it gets more interesting once one of the coils has more turns than the other. You know this from power transformers: 230 volts can be transformed into, say, 10 volts. That means the winding ratio between primary and secondary of this power transformer is 23:1. But a transformer can also work the other way around and transform a small voltage into a higher voltage. A ribbon mic transformer usually has a ratio between 1:20 and 1:40. As a side effect, the impedance is also transformed. The ribbon element itself has an impedance of less than 1 ohm. The transformer turns this into an impedance in the usual range of 200-600 ohms. Despite the powerful transformer boost, a ribbon is typically lower output than a moving coil dynamic mic, let alone condensers. So you need a decent microphone preamp to be able to take full advantage of a ribbon microphone.

New Development: Active Ribbon Mics

Because ribbon microphones are low output and require a lot of clean gain in many applications, some clever guys devised ribbon microphones with internal preamp electronics. There’'s hardly any microphone preamp or mixer that does not offer phantom power for condenser mics. So why not use that power for ribbons, too? The best known phantom powered active ribbon microphones are made by Royer Labs. But other manufacturers such as Sontronics have followed their suit. Beware: Do not apply phantom power to any ribbon microphone other than these active phantom powered ribbons. Normal passive ribbon microphones can be damaged by phantom power!

Din kontaktperson
Tel +49-9546-9223-30
Fax +49-9546-922328
PA
Tel +49-9546-9223-35
Fax +49-9546-9223-24
Hot Deals Beställ en gratis Hot Deal!

Över 9.200.000 musiker prenumererar redan på Thomann Hot Deals. Börja prenumerera gratis och få tillgång till mer än 400 aktuella erbjudanden!

Ribbon Microphones översikt

Harley Benton Fusion-HSH Roasted Maple Slate Digital ML-2 Alesis Nitro Kit Mesh Kit DPA 4066-OC-A-F10-LH Slate Digital ML-1 JHS Pedals The Bonsai Zynaptiq Intensity Sennheiser ew IEM G4 A-Band Showtec Compact Par 18 MKIII Tour Tech 21 DP-3X Harley Benton Fusion-HSH MN Aqua Stairville Wild Wash Pro 648 LED RGB DMX
Rekommenderat
Harley Benton Fusion-HSH Roasted Maple

Electric Guitar Ergonomically shaped mahogany body, "Ultra Flame" flamed maple veneer top, Matching headstock, Bolt-on neck from "roasted" Canadian flamed maple, "Roasted" maple fretboard, Neck shape: Modern C, Clay Dot fretboard inlays, 24 Medium jumbo stainless steel frets, Nu-Bone...

Till produkter
406 €
(2)
Rekommenderat
Slate Digital ML-2

Small Diaphragm Condenser Microphone For Slate Digital VRS8 Thunderbolt audio interface, similar linear and flat frequency response to the Slate Digital ML-1, Allows microphone placement that is difficult or impossible for a larger microphone, Side mounted pad switch -...

Till produkter
159 €
Rekommenderat
Alesis Nitro Kit Mesh Kit

Alesis Nitro Mesh Kit, e-drum set for beginners, Mesh Heads for toms and snare, Nitro drum module with 385 sounds, 25 preset kits, 15 user kits, 60 songs, metronome, mono 1/4" jack outputs (L/R) to connect speakers or mixer, stereo...

Till produkter
385 €
Rekommenderat
DPA 4066-OC-A-F10-LH

DPA 4066-OC-A-F10-LH, d:fine CORE 4066 Omni Headset Mic, professional headset microphone with removable and adjustable neck holder for left or right-sided use. Omnidirectional, 20Hz-20kHz with 3dB boost between 8-20kHz, 144dB SPL max.,TA-4F Switchcraft connector for Shure Transmitter . beige, Great...

Till produkter
725 €
Rekommenderat
Slate Digital ML-1

Large-diaphragm condenser microphone Neutral ML-1 condenser microphone that can be combined with VMS hardware and software, Optional Neutral VMS preamp ensures minimal sound-colouration (not included!), Via VMS plug-in software, you can completely change the sound characteristics even after recording,...

Till produkter
855 €
(1)
Rekommenderat
JHS Pedals The Bonsai

Effect Pedal Overdrive, 9 Tube Screamer Overdrive modes, 5 Classic TS circuits and 2 popular mods, Analogue operation, True bypass, Volume, sustain and tone controls, 9-Way rotary control to select between Tube Screamer modes (OD-1 / TS-808 / TS-9...

Till produkter
259 €
Rekommenderat
Zynaptiq Intensity

Zynaptiq Intensity (ESD); enhancer plugin; innovative algorithm increases detail, clarity, density and loudness of any audio signal; suitable for single tracks, groups, mixbus or mastering; easy to us clearly arranged user interface; additional soft-knee saturating limiter at the output stage;...

Till produkter
150 €
Rekommenderat
Sennheiser ew IEM G4 A-Band

Evolution Wireless In Ear System Consists of UHF bodypack receiver (EK IEM G4), 9.5" transmitter (SR IEM G4) and IE4 earphones, Stereo / focus / mono modes, Up to 1680 frequencies in 42 MHz switching bandwidth, 20 Channel banks...

Till produkter
990 €
Rekommenderat
Showtec Compact Par 18 MKIII Tour

LED headlights Noiseless due to fanless cooling, Compact flat housing, Double bracket for upright and hanging mounting, Light source: 18x 3 Watt RGB 3in1 LED, Beam angle: 28°, Light output: 9600 Lux at 1 m, 4170 lux at 2...

Till produkter
193 €
Rekommenderat
Tech 21 DP-3X

Preamp for bass dUg Pinnick signature model, Controls: volume, chunk, high, mid, low, comp, drive, Gain switch, Mix button, Chromatic tuner, XLR DI output, TRS input / output, Headphone output, Dimensions (W x D x H): 19.7 x 6.4...

Till produkter
304 €
Rekommenderat
Harley Benton Fusion-HSH MN Aqua

Electric Guitar Ergonomically shaped mahogany body, "Ultra Quilted" plywood veneer top, Matching headstock, Bolt-on Canadian Hard Maple neck, Maple fretboard, Neck profile: Modern C, Clay Dot fretboard inlays, 24 Medium jumbo stainless steel frets, Nu-Bone nut, Nut width: 42...

Till produkter
304 €
(1)
Rekommenderat
Stairville Wild Wash Pro 648 LED RGB DMX

Multi-Functional LED Spotlight with 4 Effects in One DeviceWith its SMD LED equipment, the Wild Wash series is a magic box for events and shows of all kinds. Whether on small to large stages, in clubs of all sizes, exhibitions,...

Till produkter
249 €
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.