﻿ Gain into 4 ohm?

July 08, 2020, 03:38:45 PM

### Author Topic: Gain into 4 ohm?  (Read 817 times)

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#### Adrian ##### Gain into 4 ohm?
« on: April 02, 2017, 12:13:33 PM »
The product page says the gain is 8 into an 8 ohm load.
I assume this is with the output transformers connected for 8 ohms.

What would be the approximate gain if the outputs are connected for 4 ohms feeding 4 ohm speakers?

VPI Prime w/Ortofon Quintet Black MC/Rothwell MCL Lundahl SUT/EROS/Submissive (3 output mod)/Mainline/Crack - Speedball/S.E.X. 2.1 - C4S/S.E.X. 3.0 - C4S/Paramounts - Blumenstein 2.2 Mini-Max w/DOF mod -Senn HD600/Viso HP50/Focal Elear.

#### Paul Joppa

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•     • • Posts: 5063 ##### Re: Gain into 4 ohm?
« Reply #1 on: April 02, 2017, 01:26:02 PM »
The voltage gain would be about 0.7 times 8, or 5.6 - 0.7 being about the square root of 1/2.
Paul Joppa

#### Adrian ##### Re: Gain into 4 ohm?
« Reply #2 on: April 03, 2017, 03:06:31 PM »
Got it:
assume power (watts) constant with v_1=8; R_1=8; R_2=4
w=v^2/R.
(V_1^2)/R_1 =(V_2^2)/R_2
v_2=v_1 √(R_2/R_1 )
v_2=8√(4/8)=5.66

(I think?)
« Last Edit: April 03, 2017, 03:10:46 PM by Adrian »

VPI Prime w/Ortofon Quintet Black MC/Rothwell MCL Lundahl SUT/EROS/Submissive (3 output mod)/Mainline/Crack - Speedball/S.E.X. 2.1 - C4S/S.E.X. 3.0 - C4S/Paramounts - Blumenstein 2.2 Mini-Max w/DOF mod -Senn HD600/Viso HP50/Focal Elear.

#### Rocketman248 ##### Re: Gain into 4 ohm?
« Reply #3 on: April 03, 2017, 04:47:46 PM »
....I understood some of those words. Nick DeBrita
Yokosuka, Japan

#### Paul Joppa

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• Hero Member
•     • • Posts: 5063 ##### Re: Gain into 4 ohm?
« Reply #4 on: April 03, 2017, 05:56:18 PM »
Got it:
assume power (watts) constant with v_1=8; R_1=8; R_2=4
w=v^2/R.
(V_1^2)/R_1 =(V_2^2)/R_2
v_2=v_1 √(R_2/R_1 )
v_2=8√(4/8)=5.66

(I think?)
Looks like you got it!
Paul Joppa