• 2018-04-24 first edition

Prejudice or preconceived idea

• There is prejudice.
• Do you know the Power Amplifier?
• Is that ture? Really?
• Do you have Power Amplifier for Loud Speaker? Right?
• Did you make sure of it?

Sound volume and Power

• The sound volume of loud speaker is given in proportion to electoric power.
• This is a scientific fact.
• The loud speaker works to make a sound.
• Therefor power amplifier is needed to drive the loud speaker.

What is the Power Amplifier?

• That outputs power.
• This is a scientific fact.
• The purpose is power output.

Now sold Amplifier

• Question:What is the now sold Amplifier?
• The answer:That is a Voltage Amplifier not Power Amplifier.
• The Voltage Amplifier gets voltage input and puts voltage output.
• The purpose is voltage output.

Power Amp. vs. Voltage Amp.

• The difference is what is output.

Power means electoric power

• P=electoric power

• For example
• where V=2.83[V]
• where impedance of loud speaker R=8[Ω]
• P=2.83×2.83÷8=1[W]

Power Amp. ≠ Voltage Amp.

• Voltage Amplifier is NOT Power Amplifier.
• Voltage Amplifier bases on fixed impedance.
• If R were fixed, Voltage Amplifier could work as Power Amplifier.

Impedance of loud speaker

• But the impedance of loud speaker changes in accordance with frequency.
• R is not fixed.
• Remember P=2.83×2.83÷R

Using Voltage Amplifier

• For example
• R=23Ω at 160Hz
• R=8Ω at 1KHz
• R=27Ω at 20KHz
• What is P=V×V÷R, where V=2.83[V]
• P=0.35[W] at 160Hz
• P=1[W] at 1KHz
• P=0.3[W] at 20KHz
• The power changes even if the input is fixed.
• Bad power causes bad sound.

Power base

• The loud speaker charactaristic are based on power.
• on condition that 1[W],1[m]
• You can see how to measure it.
• IEC 60268-5

Innovation

• Welcome to new era.
• from Voltage Amplifier(substitution) to Power Amplifier(genuineness)
• I had developed "genuine Power Amplifier".
• Would you like to enjoy the genuine sound?
• Amazing and awesome sound.
• Do you want to get genuine Power Amplifier?
• GPA1dc

Genuine Power Amplifier

• The genuine Power Amplifier puts right power output regaredless of impedance changes.
• Right volume and right sound
• LIIE technology
• Load Impedance Indepedent Engine