Why 5A fuses for 2ohm speakers?
If the 5A fuses will pass 10Arms to the 2ohm load then maximum power is only 200W into 2r0 and that only needs +-35Vdc
Now if 20Arms were to pass to the load then maximum power would be 800W into 2r0. and that needs +-65Vdc
To get the benefit of your +-100Vdc supply rails the fuses would need to pass ~30Arms to the 2ohm speaker load. Giving ~1800W into 2r0.
Can your 5A fuses pass ~42Apk to the loading?
BTW,
6ohm speakers will run from F5A fuses.
If the 5A fuses will pass 10Arms to the 2ohm load then maximum power is only 200W into 2r0 and that only needs +-35Vdc
Now if 20Arms were to pass to the load then maximum power would be 800W into 2r0. and that needs +-65Vdc
To get the benefit of your +-100Vdc supply rails the fuses would need to pass ~30Arms to the 2ohm speaker load. Giving ~1800W into 2r0.
Can your 5A fuses pass ~42Apk to the loading?
BTW,
6ohm speakers will run from F5A fuses.
Last edited:
the link says http://www.zosilnovace.eu/Zosilnovac700W.htm
Zosilòovaè 700W
Technical parameters:
Supply voltage: max. + /-80V
Current protection: 2x15 fast Fuses
Output: 680W/2R, 450W/4R, 260W/8R (measured 550VA transformer with voltage 2x54V empty)
Frequency response: 10 to 180 000Hz/-3dB
Harmonic distortion: 0.034% in 480W/1kHz; 0.07% at 480W/10kHz
Intermodulation distortion: 0.037% at 300W / 80 +7 kHz
Impedance: min. 2R
Speed course (SR): 35V/us
Input sensitivity: about 1.1 V for full excitation
PCB dimension: 90x260 mm
Note: Measured performances are measured on a 550VA transformer as stated in the note. Output power is measured for max. 50-10 minutes because the transformer is considerably overloading. When properly sized to about 1 kVA transformer is not a problem to achieve performance 800W/2R.
Zosilòovaè 700W
Technical parameters:
Supply voltage: max. + /-80V
Current protection: 2x15 fast Fuses
Output: 680W/2R, 450W/4R, 260W/8R (measured 550VA transformer with voltage 2x54V empty)
Frequency response: 10 to 180 000Hz/-3dB
Harmonic distortion: 0.034% in 480W/1kHz; 0.07% at 480W/10kHz
Intermodulation distortion: 0.037% at 300W / 80 +7 kHz
Impedance: min. 2R
Speed course (SR): 35V/us
Input sensitivity: about 1.1 V for full excitation
PCB dimension: 90x260 mm
Note: Measured performances are measured on a 550VA transformer as stated in the note. Output power is measured for max. 50-10 minutes because the transformer is considerably overloading. When properly sized to about 1 kVA transformer is not a problem to achieve performance 800W/2R.
37 is the AC voltage from the transformer when fed with rated input voltage and loaded to deliver exactly 15Aac.
The peak of a sinewave waveform is Vac*sqrt(2)
A 37 Vac transformer will have a peak output voltage of ~52.3Vpk when driven at rated voltage and loaded to rated current.
You cannot get 80Vac nor 80Vdc from your transformer.
However, if you series connect the secondary for 74Vac and increase the supply voltage you can get a single 80Vac, if you are careful to avoid overheating.
The peak of a sinewave waveform is Vac*sqrt(2)
A 37 Vac transformer will have a peak output voltage of ~52.3Vpk when driven at rated voltage and loaded to rated current.
You cannot get 80Vac nor 80Vdc from your transformer.
However, if you series connect the secondary for 74Vac and increase the supply voltage you can get a single 80Vac, if you are careful to avoid overheating.
