BSC for Fostex FE127E Metronome

bluegti · 7th February 2008, 05:15 PM

My Metronomes made their public debut last week and were very well received. I was reviewing the plans when I noticed the Suggested Baffle-Step Compensation Starting Points.

Should I use the BSC for the FE126E, or are there different values I should use for the FE127E?

Also, do I need the Zobel too? If so, what values should I use?

Jeb-D. · 7th February 2008, 05:24 PM

BSC circuit value is determined by Baffle width and driver impedance. So if the drivers are the same impedance and baffles are the same width the circuit should be the same for both. People have had luck using no Zobel with the FE167E. Try with just a BSC and listen. If the highs are too much for your liking then add a Zobel.

1.5mH in parallel with a 6ohm resistor seems to be a common starting point for FE167E in most applications. However I noticed their suggested values are different. It depends how many dB of correction you want. Here is a calculator speadsheet:
http://www.quarter-wave.com/General/BSC_Calculator.xls

Usually 6dB is the most you would want. As that is the "open space" measurement. Bipolar designs don't need BSC.

7th February 2008, 05:15 PM	#1
bluegti diyAudio Member Join Date: Nov 2004 Location: Northern Virginia	BSC for Fostex FE127E Metronome My Metronomes made their public debut last week and were very well received. I was reviewing the plans when I noticed the Suggested Baffle-Step Compensation Starting Points. Should I use the BSC for the FE126E, or are there different values I should use for the FE127E? Also, do I need the Zobel too? If so, what values should I use?

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7th February 2008, 05:24 PM	#2
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	BSC circuit value is determined by Baffle width and driver impedance. So if the drivers are the same impedance and baffles are the same width the circuit should be the same for both. People have had luck using no Zobel with the FE167E. Try with just a BSC and listen. If the highs are too much for your liking then add a Zobel. 1.5mH in parallel with a 6ohm resistor seems to be a common starting point for FE167E in most applications. However I noticed their suggested values are different. It depends how many dB of correction you want. Here is a calculator speadsheet: http://www.quarter-wave.com/General/BSC_Calculator.xls Usually 6dB is the most you would want. As that is the "open space" measurement. Bipolar designs don't need BSC.

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