impedance bridging matching circuit devices damping factor impedances dB decibel loss - There are no 4 ohm or 8 ohm amplifiers - voltage matching and bridging calculations calculation the damping loudspeaker speaker microphone - sengpielaudio
 
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Interconnection of two audio units ●
Only Voltage Bridging or impedance bridging Zout < Zin
 
In electronics, audio and sound recording, only a high impedance bridging, voltage bridging,
or simply bridging connection is used, which maximizes transfer of a voltage signal to the load.

Damping (signal loss) of an interface, when Zout and Zin meet.
Interface damping means voltage level damping compared to the open circuit case.
 
 
Z2 (Zout) is the small internal resistance (source impedance or output impedance) of the first unit.
Z1 (Zin) is the larger external resistance (load impedance, input impedance) of the following equipment.
 
There is no power matching or impedance matching in audio engineering. We use only voltage matching 
 
 
Z2 (Zout) is the small internal resistance (source impedance or output impedance) of the first unit and Z1 (Zin) is the larger external resistance (load impedance, input impedance) of the following equipment. With resistance R it is always meant the impedance Z. In recording studio technique the voltage bridging Z2 < Z1 is used for the interconnection in general, which is a voltage divider.
This are great advantages, because it is best for the large frequency bandwidth to be transmitted and by changing loads, by different cable lengths, and by parallel connection of several devices.
It keeps the voltage high at the input of the following gear.
The impedance matching concept Z2 = Z1 is expected to remain in telecommunications, digital technique, but not in analogue audio.
 
 
E guitars and microphones are sources. They can only show us their output impedances.
 
Amplifier inputs and loudspeakers are loads. They can only show us their input impedances
 
 
Calculation of the damping bridging circuit devices damping factor - sengpielaudio

    Microphone Microphone pre amplifier (mixer)
Mikrofon
Mikrofonvertaerker
Output impedance Zsource =   ohms    |     Input impedance Zload   ohms
 
  Signal or load loss Δ L   dB  ≡  %
  Damping factor DF   = Zload / Zsource = Z1 / Z2
 
In recording studio technique the microphone Zsource (Z2) is less than 200 ohms and Zload (Z1)
of the mixer (pre-amp) is between 1000 and 2000 ohms. A voltage loss by attenuation of less than 1 dB is acceptable in professional audio engineering.
The cable resistance (impedance) is a part of the output impedance of the amplifier. Because Voltage at the input of the amplifier = open-circuit voltage of the source × Zload/(Zload+Zsource)

Power Amplifier     Passive Loudspeaker
Leistungsverstärker
Passiver Lautsprecher
Output impedance Zsource =   ohms    |     Input impedance Zload   ohms
 
  Signal or load loss Δ L   dB  ≡  %
  Damping factor DF   = Zload / Zsource = Z1 / Z2
 
 
There is no impedance matching Zout = Zin between power amplifier and loudspeakers.
Power matching is a myth. We use voltage bridging Zout << Zin. The same goes for tube
amplifiers whose output impedance is about one tenth of the speaker impedance.
Thus we also have Zout < Zin
. That's a fact!
Please read this:
"8 Ohm Output" and "150 Ohm Input" - What is that?
 

The seldom specified source resistance Z2 (Zout) is hidden in the damping factor DF.
A damping factor of at least DF = 100 is entirely in order. Analog studio devices have
a source impedance Z2 of less than 40 ohms, with a load impedance of Z1 greater
than 10 kiloohms. Zsource << Zload.
Impedance matching (power matching) Z1 = Z2 on the other hand, is used in the
telecommunications and the RF technology applied to antennas.

Aha! Notice:
There are really no 4 ohm amplifiers and
there are no 8 ohm amplifiers for the
4 ohm or 8 ohm loudspeakers.

Who does not believe that, should quickly
click away and remain blind.
 
 
In sound engineering there is no Power matching or Impedance matching.
In audio we use only
Voltage bridging or high Impedance bridging.
 
 
 
In audio engineering, we use even in power amplifiers which operate the speakers, really only voltage bridging.
The frequent demand for "real" matching Zout = Zin is really wrong.

 
 
There is an ineradicable myth. The output impedance of the amplifier is always a
tenth or a hundredth of the value of the loudspeaker impedance. The value of
the output impedance of the amplifier
Zsource is always hidden in the damping factor DF and can easily be calculated:
Zsource = Zload / DF.     Zload is the impedance of the loudspeaker.
The cable resistance (impedance) is a part of the output impedance of the
amplifier. Because of the high voltage of the source, cable screening (shielding)
is not necessary in this case.
 
The typical continuous query in the forums: "Can I use 4 ohm speakers to a
6 ohms amplifier?" (See reply under "Notice".)
 
These issues show that there must be storytellers underway. How can we get
rid of the nonsense of 2 to 16 ohms amplifiers?
The output impedance of an amplifier Zout is always smaller than 0.5 Ohm.
Zout << Zin.
 
Amateurs are happy to speak of an 8 ohm amplifier, if they think not correctly
that the amplifier output should be connected to "8 ohm speakers".
Dealers use exactly these unclear expressions. In reality, the speaker
impedance curve of a loudspeaker is never a straight line.

Typical loudspeaker impedance curves vs. frequency

Studio parts Output impedance
Zsource
Input impedance
Zload
Microphone 35 Ω to 200 Ω
Microphone preamplifier 1 kΩ to 2 kΩ
Power amplifier 0.01 Ω to 0.1 Ω
Loudspeaker 2 Ω to 16 Ω
Studio gear (mixer) 40 Ω 10 kΩ to 20 kΩ

Impedances behave like an unloaded voltage divider. Zload = Z1and Zsource = Z2.

Signal loss in dB: 20 log [Z1 / (Z1 + Z2)]
 
Damping factor: DF = Z1 / Z2
 
Source impedance in ohms: Z2 = Z1 / DF

Please enter two values, the third value will be calculated.

Damping factor DF    Magic Triangle DF
Load impedance Z1 = Zload      ohms 
 Source impedance Z2 = Zsource  ohms 
Calculation of the damping of impedance bridging or
power matching an interface connecting Zout and Zin


Calculations: voltage divider (potentiometer) -
damping pad - loaded and open circuit (unloaded)


8 Ohm Output and 150 Ohm Input - What is that?

Amplifier, Loudspeaker, and Ohms - How do they work together?

Please tell your friends: There are really no 4 or 8 ohms amplifiers to match the speakers.

Interconnection of two audio units equals a circuit of a voltage divider − Z2 << Z1.

Schnittstelle Sengpielaudio

Attention: The numbering of the impedances is inversely to a voltage divider.

Spannungsteiler

The two impedances Z1 and Z2 at one device

Calculation of the damping bridging circuit devices damping factor - sengpielaudio

The damping factor is usually given as numerical value, but also in decibels.

Enter a value in the left or right box.
The calculator works in both directions of the
sign.

Damping factor DF as number 
Zin / Zout
 ↔  Damping factor as dB value 
dB (positive)
Formula DF   Formula DF in dB
DF = 10 ≡ 20 dB                                    DF = 100 ≡ 40 dB

Calculation of the damping factor

How do I calculate the damping factor DF for example, at 1 kHz, if neither the impedance of the source Z2 nor the impedance of the load Z1 is known?
Allow the source to send out of a 1 kHz sine tone and measure the resulting voltageV0 at the output without any load. Then measure at this point the voltage VL, when the load is applied.
The damping factor is:

DF = VL / (V0VL)
 
(V0VL) is the voltage drop by the connected load.

Calculation: Cable Length, Cable Capacitance, and Treble Loss (Cutoff Frequency)

Aha!
 
The word "power amplifier" is a misnomer - especially in audio engineering.
Voltage and current can be amplified. The strange term "power amplifier" has become understood to mean an amplifier that is intended to drive a load such as a loudspeaker.
We call the product of current and voltage gain "power amplification".

 

Effect of the input impedance on guitar amps

Schnittstelle - Sengpielaudio

Influence of the amplifier impedance on the guitar pick-up

Guitar resonance - Sengpielaudio
 
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