EP4000 input signal voltage - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 01-20-13, 07:59 AM
HTS Senior Moderator

Join Date: Apr 2006
Location: Katy, Texas
Posts: 8,809
Re: EP4000 input signal voltage

That’s because the signal from your ipod is incompatible with what the amp is expecting. Assuming you’re using the ipod’s headphone jack, it has a 3.5 mm TRS plug that’s sending this signal:
Tip – signal right (+)
Ring – signal left (+)
Sleeve – signal (-)
The amp’s 1/4" TRS jack is a balanced connection expecting this signal:
Tip – signal (+)
Ring – signal (-)
Sleeve – chassis ground
What you need is a 3.5 mm headphone splitter jack that breaks out to say, a pair of RCA connectors. Then you can send the two RCA’s to the amp’s inputs with a pair of RCA -> 1/4" cables.

Regards,
Wayne

Wayne A. Pflughaupt is offline
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Old 01-20-13, 11:40 AM Thread Starter
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Bubba

Join Date: Sep 2009
Posts: 177
Re: EP4000 input signal voltage

I will give that a try, thanks!

Anyone have any input on the correct input voltage for the EP4000?
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Old 01-20-13, 05:52 PM
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Stereodude

Join Date: Feb 2010
Posts: 261
Re: EP4000 input signal voltage

Quote:
black_z wrote: View Post
Anyone have any input on the correct input voltage for the EP4000?
Per the manual to achieve full power into an 8 ohm load (running stereo) it needs 1.23Vrms. It also states it has a max of 50x voltage gain. You can use Ohm's law (V=iR & P=iV) to figure out the amplifier's output voltage into a certain load at a given power level and then divide that by 50 to find the minimum needed input voltage to get that output?
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Old 01-21-13, 09:23 PM Thread Starter
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Bubba

Join Date: Sep 2009
Posts: 177
Re: EP4000 input signal voltage

Guess I need to dig that manual out! What's it say for 4 and 2 ohms?
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Old 01-22-13, 06:59 AM
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Stereodude

Join Date: Feb 2010
Posts: 261
Re: EP4000 input signal voltage

Quote:
black_z wrote: View Post
Guess I need to dig that manual out! What's it say for 4 and 2 ohms?
It doesn't. It will be less than the 8 ohm number by probably something like 10-15% for 4 ohms (stereo) and another 10-15% for 2 ohms (stereo). You can do the math if you want an exact number.

P=(Vout^2)/R

Vout=(P/R)^.5

Vin = Vout/50
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Old 01-22-13, 10:01 PM Thread Starter
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Bubba

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Posts: 177
Re: EP4000 input signal voltage

That's confusing. Why would it be less, for more power?
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Old 01-22-13, 10:11 PM
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Stereodude

Join Date: Feb 2010
Posts: 261
Re: EP4000 input signal voltage

Quote:
black_z wrote: View Post
That's confusing. Why would it be less, for more power?
Because the amplifier's power doesn't double every time the impedance is halved.
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Old 01-23-13, 12:06 PM Thread Starter
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Bubba

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Posts: 177
Re: EP4000 input signal voltage

Unfortunately, huh! Is measuring the volts as simple as using a multimeter on the wires supplying signal to the EP4000?
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Old 01-24-13, 04:49 PM
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Stereodude

Join Date: Feb 2010
Posts: 261
Re: EP4000 input signal voltage

Yes, and no. Yes, you just hook a multimeter up to the wires. Having the correct type of meter and interpreting the results correctly is the no. If you have a meter that does TrueRMS AC voltage readings you're part way there. You need to play low frequency sine wave test tones and measure those. Keep in mind even most TrueRMS multimeters do not specify the tolerance / error of voltage measurements of frequencies below 45Hz.
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Old 01-25-13, 03:31 PM Thread Starter
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Bubba

Join Date: Sep 2009
Posts: 177
Re: EP4000 input signal voltage

Uggghhhh... Doesn't sound like an easy way for me to do this, properly.
black_z is offline

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