Forte Model 1A inputs max voltage

cuencano · 6th December 2005, 06:37 AM

Hello,

Anybody here knows what the max input voltage for the Forte model 1A is? I'm trying to match it with a dac, and want to make sure I can get as much volume as possible out of the setup...

The dac I'm looking at is a bel canto dac 1 (I think it is a 2 volt output)

Thanks

Nelson Pass · 7th December 2005, 06:19 PM

I seem to remember a 26 dB gain figure, so you would get
50 watts from a 20 volt output. As 26 dB is a factor of 20,
the input voltage becomes 1 volts rms, 1.4 volts peak.

cuencano · 17th December 2005, 08:20 PM

I did not understand anything from the math involved ( can't make sense of it even though there are only a couple of numbers) but I got the answer

1 to 1.4 max. Thaks,
Norberto.

jacco vermeulen · 17th December 2005, 08:33 PM

Double power is 3 dB more, 2 watts in your loudspeaker gives you 3 dB more sound pressure than 1 watt.

Double voltage is 6 dB more, from 1 to 2 volts is 6 dBV, from 2 to 4 is again 6 dbV.
From 1 volt to 20 volt is around 26 dB.

Input voltage of the Forte 1 (40 watts) was "about" the same.
Good thing Mr Pass built your 1A, not you.

cuencano · 23rd December 2005, 03:02 PM

Hello,

I got another question regarding this amplifier, Would it be driven by a DAC that requires a minimum 10k ohms input impedance (CAL dac)?

6th December 2005, 06:37 AM	#1
cuencano diyAudio Member Join Date: Nov 2003 Location: Atlanta	Forte Model 1A inputs max voltage Hello, Anybody here knows what the max input voltage for the Forte model 1A is? I'm trying to match it with a dac, and want to make sure I can get as much volume as possible out of the setup... The dac I'm looking at is a bel canto dac 1 (I think it is a 2 volt output) Thanks

17th December 2005, 08:33 PM	#4
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Double power is 3 dB more, 2 watts in your loudspeaker gives you 3 dB more sound pressure than 1 watt. Double voltage is 6 dB more, from 1 to 2 volts is 6 dBV, from 2 to 4 is again 6 dbV. From 1 volt to 20 volt is around 26 dB. Input voltage of the Forte 1 (40 watts) was "about" the same. Good thing Mr Pass built your 1A, not you. __________________ Looks like Sponge Bob has killed another thread.

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7th December 2005, 06:19 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	I seem to remember a 26 dB gain figure, so you would get 50 watts from a 20 volt output. As 26 dB is a factor of 20, the input voltage becomes 1 volts rms, 1.4 volts peak.

17th December 2005, 08:20 PM	#3
cuencano diyAudio Member Join Date: Nov 2003 Location: Atlanta	I did not understand anything from the math involved ( can't make sense of it even though there are only a couple of numbers) but I got the answer 1 to 1.4 max. Thaks, Norberto.

23rd December 2005, 03:02 PM	#5
cuencano diyAudio Member Join Date: Nov 2003 Location: Atlanta	Hello, I got another question regarding this amplifier, Would it be driven by a DAC that requires a minimum 10k ohms input impedance (CAL dac)?

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