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Old 2nd January 2015, 01:50 AM   #1
kevnaff is offline kevnaff  United Kingdom
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Default Is this signal path correct?

I am building a 2 way active studio monitor for a school project, however I am unsure about the signal path. My monitor is only going to have a Line input, and I want to be able to create a signal path from an audio interface to my monitor.

Here is my idea of how the signal path goes:

Output from audio interface (Line level) (Electrical energy)
Input at studio monitor (Line level) (Electrical energy)
Crossover unit (Line level) (Electrical energy)
Power amp (Line level to Speaker level) (Electrical energy)
Driver (Speaker level) (Electrical energy to Acoustic energy)


A few things on the matter

Does this signal path make sense?
Are there any other components or amplification processes that I need to consider, such as pre-amps?

Thanks!
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Old 2nd January 2015, 02:28 AM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by kevnaff View Post
Output from audio interface (Line level) (Electrical energy)
Input at studio monitor (Line level) (Electrical energy)
Crossover unit (Line level) (Electrical energy)
Power amp (Line level to Speaker level) (Electrical energy)
Driver (Speaker level) (Electrical energy to Acoustic energy)
Does this signal path make sense?
Are there any other components or amplification processes that I need to consider, such as pre-amps?
Seems ok. You do need a level adjustment on the tweeter. This can be at the input of the tweeter power amp. The crossover gain can probably be 0dB.
Normally, the tweeter will be more efficient than the woofer, so if the two amplifiers have the same gain, you will need to be able to attenuate the tweeter.

Last edited by rayma; 2nd January 2015 at 02:52 AM.
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Old 2nd January 2015, 02:50 AM   #3
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Let's briefly discuss terms for a moment.
An audio "interface" is a system used to connect output & input, one device to another, etc. So I believe you mean "audio source" in your number one entry above.

Now, your path does make sense, with a qualifier that the line level outputs from the crossover go to two power amps.
The power amps will have a sensitivity rating, i.e. what level of input signal is required for maximum output signal.
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Old 2nd January 2015, 03:46 PM   #4
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"Audio Interface" is a common pro audio component. It's similar to a hi-fi pre-amp with some added functions.

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Old 2nd January 2015, 04:08 PM   #5
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Thanks, I didn't know that (although for all intents and purposes it does conform to my definition). The OP's last question is what caused me to think he was referring to an audio playback source.
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Old 2nd January 2015, 04:32 PM   #6
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I didn't know about "Audio Interface's" until recently. More likely to see them in small musician/recoding rooms than in a larger recording studio.
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Old 3rd January 2015, 01:38 PM   #7
kevnaff is offline kevnaff  United Kingdom
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Thanks for the help, I am going to have a crossover gain of 0dB as suggested.

Any idea on how I can determine how much I need to attenuate the tweeter by compared to the woofer?

Thanks
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Old 3rd January 2015, 02:08 PM   #8
rayma is offline rayma  United States
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Originally Posted by kevnaff View Post
Any idea on how I can determine how much I need to attenuate the tweeter by compared to the woofer?
Just use a pot (which can go from no attenuation to complete attenuation), and there'll be a "right " point to set it, either by ear or measurement.
If you use a linear pot, it's likely that point will be near or below the center, but you don't know the acoustic output levels of the woofer and tweeter.
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Old 3rd January 2015, 04:06 PM   #9
kevnaff is offline kevnaff  United Kingdom
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Is there a certain name/value for a potentiometer that goes from no attenuation to complete attenuation?
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Old 3rd January 2015, 04:12 PM   #10
rayma is offline rayma  United States
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Quote:
Originally Posted by kevnaff View Post
Is there a certain name/value for a potentiometer that goes from no attenuation to complete attenuation?
They all will do that. Some are linear taper, some audio (log) taper. This affects how the level changes.
Turned to minimum (full counterclockwise), the amplifier input is shorted to ground, so there's no sound.
You likely need a linear potentiometer, maybe 5k to 10k in value. Can you post a schematic?
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