Do I need a Zobel network?

Do I need a Zobel network?

Zobel network is needed to correct some instabilities of the amplifier, because of (imprevisible) phase variations caused by wires or/and crossovers, drivers, etc. Problems are occuring at high fréquencies (10 Mhz or so…), and cause some sound harshness. This can vary from case to case, from time to time.

What does a Zobel network do?

A Zobel network is used to flatten a driver’s impedance (usually a woofer or mid-range), therefore making the filter (usually low-pass) more effective. Their values are chosen to minimize the impedance rise of a driver above the resonant frequency.

What is a Zoble?

A Zobel is a series resistor-capacitor (R-C) network that is connected in parallel with a loudspeaker driver in order to neutralize the effects of the driver’s voice coil inductance L(e).

What is a Zobel crossover?

Zobel networks for impedance linearization. Useful in some cases for designing crossovers. A Zobel network is a series resistor-capacitor (Req-Ceq) network that is connected in parallel with a loudspeaker driver in order to neutralize the effects of the driver’s voice coil inductance Le (see note below about Le).

What is Thiele network?

The main function of the Thiele network is to isolate the external load capacitance, Cload, from the amplifier output at HF.

How do I reduce the sensitivity of a tweeter?

There are only a few steps you’ll need:

1. Find the resistors you need based on the tweeter impedance (Ohms) and the tweeter volume, in decibels, you want to decrease.
2. Buy power resistors needed.
3. Connect the resistors using a reliable connection as shown in the diagram.

What is a Zobel circuit?

A Zobel is an impedance matching circuit often used with loudspeakers. A Zobel circuit is also known as a Boucherot cell or somewhat incorrectly as an RC snubber. The nominal impedance of a loudspeaker is not constant, and rises significantly at the upper end of the audio band.

What is a Zobel network in audio?

For example, when using passive crossovers in multi-way speakers the impedance reaches minimum values below 2 Ω, which needs to be compensated. This is done by a so called “Zobel” network (Figure 10) to achieve a flat impedance curve for the required frequency range of the speaker.

What is ZB = Z0 in a Zobel filter?

The purpose of setting ZB = Z0 is to make the filter section symmetrical. This has the advantage that it will then present the same impedance, Z0, at both the input and the output port. A Zobel filter section can be implemented for low-pass, high-pass, band-pass or band-stop.

What is a Zobel equaliser used for?

BBC engineers equalising audio landlines circa 1959. The boxes with two large black dials towards the top of the equipment racks are adjustable Zobel equalisers. They are used both for temporary outside broadcast lines and for checking the engineer’s calculations prior to building permanent units