I just need some help to figure this out.
I have a old sony system with what apears to be labeled as a STK 4182 II amp that is rated at 80w + 80w @ 10%THD but when I search the chip model I get a 45w + 45w @ 0.4%THD Chip whats up with that I just want to know is the chip mislabeled because I did tests and I get 80w RMS sometimes I get close to 130w RMS when going into clipping So please just a little help I'm still new to all of this
I have a old sony system with what apears to be labeled as a STK 4182 II amp that is rated at 80w + 80w @ 10%THD but when I search the chip model I get a 45w + 45w @ 0.4%THD Chip whats up with that I just want to know is the chip mislabeled because I did tests and I get 80w RMS sometimes I get close to 130w RMS when going into clipping So please just a little help I'm still new to all of this
A lot depends on how you measure and interpret all this.
130wrms would imply around 32 volts rms developed across 8 ohms which would in turn need rails over -/+50 volts DC. For 4 ohm it would be 23 volts rms and rails of nearly -/+40 volts.
It was common for manufacturers to rate power output in less than realistic terms such as peak music power etc and also at very high levels of distortion.
So in order for you to say you have 80 wrms we need to also know at what load impedance you are measuring this and for you to do the calculation based on rms voltage measured across that impedance. We also ideally should know how distorted things are which even a scope check would show as basically OK or no good.
When you look at the chip data sheet you also need to look at the test conditions and the supply voltages and impedances it is tested at.
130wrms would imply around 32 volts rms developed across 8 ohms which would in turn need rails over -/+50 volts DC. For 4 ohm it would be 23 volts rms and rails of nearly -/+40 volts.
It was common for manufacturers to rate power output in less than realistic terms such as peak music power etc and also at very high levels of distortion.
So in order for you to say you have 80 wrms we need to also know at what load impedance you are measuring this and for you to do the calculation based on rms voltage measured across that impedance. We also ideally should know how distorted things are which even a scope check would show as basically OK or no good.
When you look at the chip data sheet you also need to look at the test conditions and the supply voltages and impedances it is tested at.
You could also leave out the blanks and even omit hitting the shift button when typing.
Best regards!
PART NUMBER VCC MIN VCC NOM VCC MAX. P. OHM CASE ORIGINAL
STK4182II — ± 33,5 ± 50 2X 45 8 4040
REPLACE PART
Усилитель на STK4182II
STK4182II — ± 33,5 ± 50 2X 45 8 4040
REPLACE PART
Усилитель на STK4182II
Last edited: