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Thank you for explaining that your house party had the sound system playing much too loud (you said it was blasting) which luckily blew up only the fuse in the transformer and not the entire circuit and speakers.
Don't forget that it is a computer sound system, not a home sound system.
i personally feel that your right would cause damage to the entire system. perhaps you forgot that you should limit the input signal to the system before being able to raise the volume control to full.Yeh, I know now, the safe bet is to keep the volume always within 50%, but when there is a volume knob, you have the right to play at any volume you want.
.......
Also 2 X TDA7296 for the sub will produce how much power with acceptable distortion? I wonder? Only you guys can help me out.
i wondered the way you took close shots of many, many things
and uploaded.
at times i felt whether you used factory photos, but the mats below indicated that it could be domestic atmosphere.
All the best for the neat restoration of the z-2300.
i personally feel that your right would cause damage to the entire system. perhaps you forgot that you should limit the input signal to the system before being able to raise the volume control to full.
the spec gives a input limit
so your rights are limited and of course out of ignorance one can kill a working system. but it is not expected of persons like RishiGuru LoL.
The datasheet for the TDA7296 shows that its output power is only 38W RMS into 8 ohms at low distortion when it has a plus and minus 26VDC supply that you have. The 60W rating is Mickey Mouse Music Power for a duration of only 1 second at high distortion when its power supply voltages are higher which is not real power. Real power is continuous RMS power at low distortion.
So each satellite speaker would get 38W if the transformer was more powerful.
The woofer is driven from two bridged ICs for an output of about 120W RMS at low distortion if the transformer was more powerful.
If the transformer was more powerful then the total power would be 196W plus an additional 196W making heat, but the transformer can supply only about 180VA when overloaded so the total output power of the amplifiers will be about 90W which is 55W for the woofer and 17.5W for each satellite.
Maybe the system was designed with a 400VA transformer and the spec's were written for it. But then they used a smaller transformer but didn't correct the spec's?
Then Logitech is a liar and a cheater.
maybe 7295 is more reliable at high power then the 7296 and Maybe the same pcb is used on several model of logitech with higher power they just change the transformer capacity and voltage.
if used within the spec, i really feel even the present one serves well for you in a domestic atmosphere, unless you have halls of size of a theatre or mini.
all the best. RISHI jee
leave it
high or low volumes depend on personal habits and also changing age
when i was at 23 or so i too liked blasting music and especially SoulDrums and Superdrums, Let there be Drums, teen tall etc of SANDY NELSON in 1970s
No.1) Applying 2 X TDA7295 for the sub woofer produces 38 X 2 = 76W @ 0.5% THD @ 26VDC.
No.TDA7296 at +/- 24V produces 46W power output at a certain point
The percentage of the volume, bass or pc volume controls do not allow you to calculate how much output power. The controls are logarithmic, not linear and the input signal level is not controlled by anything.Currently playing a Kenny G "Paradise" track at 25% volume, 50% bass with PC volume set at 50%.
No.
Bridging two amplifiers almost doubles the output voltage swing and almost doubles the current in the speaker. So the output power is (almost 4 times) a little more than 3 times as much as with a single amplifier (120W instead of 38W). Each TDA7296 has an output of 60W RMS which is too high for them. TDA7295 ICs would still be overloaded but would be more reliable. But the puny transformer limits the output power to about 55W/2= 27.5W for each IC in the bridged amplifier which is fine.
No.
A single TDA7296 clips when its output is only 38W into 8 ohms with your plus and minus 26V supply (not 46W). Its power dissipation (heating) shows to be 16W so its efficiency is 70% which is pretty good for a class-AB amplifier. The power dissipation increases when the output power is reduced to half.
The datasheet does not have enough details about bridging so I guessed that the output will be somewhere from 96W at 0.09% distortion to 120W at 0.5% distortion. You can't hear any difference between 96W of music or 120W of music since our hearing's sentitivity to loudness is logarithmic. Ten times the power sounds only twice as loud.You said before: "The datasheet for the TDA7295 amplifier IC shows that it begins to clip when the bridged amplifier for the sub-woofer has an output of only 96W into 8 ohms."
That is correct now that we looked at the 70% efficiency when the amplifiers are just clipping a little.So, the sub gets (126/5) * 3 =~ 76W while each satellites get 25W
It is probably 70% like the weaker one.3) What is the efficiency of the TDA7295 at the clipping point @ 8 ohms @ 26 VDC? I cannot find it from the graphs of the spec sheet.
I didn't look to see if the more powerful TDA7294 will work in the circuit for the weaker ones. They all might be the same and are tested to see their max voltage, max current and max power. If they are all the same then the TDA7294 ICs will not make any difference because the puny cheap transformer is limiting the continuous output power.4) Lastly, if I replace all this 60W TDA7296 chips with 100W TDA7294 chips, will it harm the other components of the amplifier? Or rather will the amplifier be more robust ?