How to choose speakers and power amplifiers

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Lessons for Beginners
PA System Course
How to choose speakers and power amplifiers

■Points in deciding the power amplifier to be combined with your speakers

"Maximum Allowable Speaker input (PGM: program)> Rated output of power amplifier (RMS: effective value)"

1.Check speaker impedance and allowable input

Example) CLASSIC PRO CSP 10
impedance: 8 Ω, Maximum Allowable input: 500 W (PGM)
2.Check the rated output of the power amplifier

Example) CLASSIC PRO CP1000
8 Ω at 340W + 340W (RMS)

Inputting a signal larger than the speaker's Maximum Allowable input or inputting a large signal with an output close to the speaker's Maximum Allowable input value for a long time can cause damage to the speaker.

If the power amplifier exceeds the maximum output, the output signal will clip. A signal whose waveform has changed like a rectangular wave by clipping may cause the speaker to be damaged, such as causing the driver to have a large amplitude or generating harmonics that cause burnout. Therefore, it is important to choose a suitable power amplifier, as it makes it easier to clip large speakers with a small amplifier, which can increase the risk of speaker damage.

■Parallel connection to connect speakers

"Total Allowable Inputs of Connected Speakers> Rated Output of Power Amplifier at Lowered Impedance"

[With parallel connection]

It is a connection method that can sound multiple speakers by connecting the speakers.
Generally, 8Ω speakers are often connected to each other. For example, if two 8Ω speakers are connected, it will be used as a 4Ω system.

【Important point】

Is the power amplifier compatible with the lowered impedance?
For CLASSIC PRO / CP1400
8Ω 560W + 560W → 4Ω 900W + 900W
Is the total value of the Maximum Allowable inputs of the two speakers above the amplifier output value as a guide?
CLASSIC PRO / CSP12 2 pcs
Maximum Allowable input: 600W+600W＝1200W
Output power at 4Ω of CP1400: 900W> Total allowable input of connected speaker: 1200W

I want to know the standard of W value !!

The target W number is said to be "one spectator = 1 W" for speech events and "one spectator = 3 W" for events where sound pressure and volume such as live shows are required. Also, in outdoor events, unlike indoors, the sound spreads, so try to use twice the W value as a guide. However, depending on various conditions, the way you hear the sound changes, so please use it as a guide only.

100W	300W	500W	1000W

Indoor speech: 100 people Outdoor Speech: 50 people Indoor live: 30 people Outdoor live: 15 people	Indoor speech: 300 people Outdoor Speech: 150 people Indoor live: 100 people Outdoor live: 50 people	Indoor speech: 500 people Outdoor Speech: 250 people Indoor live: 160 people Outdoor live: 80 people	Indoor speech: 1000 people Outdoor Speech: 500 people Indoor live: 350 people Outdoor live: 170 people
conference room Over-the-counter sales Club activities Acoustic live	Wedding party karaoke Sports day Street live	Rehearsal studio Sports day Club DJ School Festival Live show	Yosakoi Live house Outdoor event Live outdoors