Power Amplifiers Up To 300 W (4 ohm) finder
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Thomann's Cool Online Guides: PA-Amps

8. Working with your Amp

How loud can you go? In fact, in terms of the sound out front, you can keep your power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
turned up full, and regulate the actual sound level through the
ConsoleA device through which audio signals are routed for mixing, monitoring, processing and re-routed for either recording, amplification or both. A console contains a number of channel strips and a selection of auxiliary, monitoring and main outputs.
mixer
- provided, of course, that your speakers are up to the job.

As we have seen, the
KeyAn additional input on a dynamics processor such as a compressor or noise gate, enabling the dynamics of one signal to control the level of another. This can be used for many functions, including ducking (compressing a music signal when a DJ or announcer speaks), synchronised gating, and (in conjunction with an equaliser) de-essing.
key
question is concerned with
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
and power ratings. An
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
optimised for low
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
performance will not be able to deliver its maximum
RMSRoot Mean Square: a way of calculating the average power over time to give a meaningful value representing the power of an audio signal. Generally thought to be the most meaningful way of measuring amplifier power output.
RMS
power rating when connected to higher
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
speakers. Getting the match right also involves using the correct cables, because they too introduce resistance within the circuit – thick, low
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
cable kept as short as possible works best.

You should also consider how you are connecting your speakers. In parallel, that is each speaker receiving a direct signal from the
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
, each additional speaker actually progressively lowers the
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
presented to the
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
. A pair of 8
OhmsThe ohm is a unit used for measuring electrical resistance or impedance, named after the German physicist Georg Ohm. The rated impedance of a speaker (in ohms) tells us how much current it will draw when matching it with an amplifier.
Ohm
speakers connected in parallel for example, will represent 4
OhmsThe ohm is a unit used for measuring electrical resistance or impedance, named after the German physicist Georg Ohm. The rated impedance of a speaker (in ohms) tells us how much current it will draw when matching it with an amplifier.
Ohms
of resistance to the
AmplifierA device for increasing the power of a signal by taking power from a supply and shaping the output to match the input signal.
amplifier
, not 16
OhmsThe ohm is a unit used for measuring electrical resistance or impedance, named after the German physicist Georg Ohm. The rated impedance of a speaker (in ohms) tells us how much current it will draw when matching it with an amplifier.
Ohms
as you might think.

However, if you connect your speakers in series, or one after the other in a single (electrical) line from the
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
, each additional speaker adds to the total resistance. Three 8
OhmsThe ohm is a unit used for measuring electrical resistance or impedance, named after the German physicist Georg Ohm. The rated impedance of a speaker (in ohms) tells us how much current it will draw when matching it with an amplifier.
Ohm
speakers, for example, would give 24
OhmsThe ohm is a unit used for measuring electrical resistance or impedance, named after the German physicist Georg Ohm. The rated impedance of a speaker (in ohms) tells us how much current it will draw when matching it with an amplifier.
Ohms
of resistance. There are also various series/parallel configurations possible, for which the calculations are rather more complicated!

Placing the Power Amp

Distance equals resistance, as far as power amps are concerned. The further the
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
is from the speakers, the more loss of signal there is, with consequent detrimental
EffectsGeneral term applied to audio processors for dynamics, time, ambience and equalisation whether in the form of 19" rack units, guitar floor pedals, or software plug-ins.
effects
on the sound. You should use short cables with low
ImpedanceThe term for electrical resistance when applied to AC current.
impedance
, and a power
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
that sits as close to the speakers it is serving as possible – save your long cable runs for
BalancedTerm used to describe a system of audio connection that employs phase inversion noise cancellation. Using two signal wires and an earth, the audio is split and phase inverted in the second signal wire. On reaching the destination the second signal is re-inverted and combined with the first. Any electromagnetic interference is picked up equally by each signal cable and so will be cancelled out by the phase inversion. A balanced line requires balanced equipment at both ends.
balanced
line-level signals.

A rack is the best way to stow your
AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
amp
, not least because it makes it easier to
TransportThe mechanism by which audio tape is physically moved across the playback/record heads of the tape machine.
transport
.
KeyAn additional input on a dynamics processor such as a compressor or noise gate, enabling the dynamics of one signal to control the level of another. This can be used for many functions, including ducking (compressing a music signal when a DJ or announcer speaks), synchronised gating, and (in conjunction with an equaliser) de-essing.
Key
points to remember when choosing your rack are:

  • The depth of your amp, and the requirement for space for any other rack units.

  • The weight of the amp - do you need a rear rack rail to help distribute the load?

  • The strength and practicality of the rack - will it take the weight, and is it easy to move? (Castors with brakes are essential!)

  • Cooling requirements - remember to leave some space around the
    AmpereUnit of current; the amount of electricity flowing through a conductor. One Ampere is equal to the flow of 6.25x10^18 electrons through a conductor in one second.
    amp
    – separating multiple amps with
    Bass ReflexA system for increasing the low frequency efficiency of an enclosed speaker by placing a port or vent in the front or rear of the cabinet. The vent consists of a (usually) cylindrical tube, the length of which dictates the resonant frequency of the port. The resonance caused by the air moving inside the cabinet results in the bass frequencies being enhanced.
    vented
    blanking panels is ideal.
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