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Old 7th April 2008, 09:45 PM   #1
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Default fe167e and Alpha 15a OB arrived

just got going a fe167e and Alpha 15a OB. Thanks MJK for your website.

sounds great so far and running them both fullrange till i get the x-over built. even with no x-over sounds very very good.

very open and airy. detailed. relaxed sound. bass is good for a passive ob.

probably go with the x-over MJK mentions if no one has anything that would work better.

maybe go with those phase plug things also.

any ideas for x-overs?

pictures to follow probably.
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Old 7th April 2008, 10:24 PM   #2
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Old 7th April 2008, 10:56 PM   #3
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NEAT!

How much power are you giving 'em?

Look forward to hearing your thoughts once you get the crossover in...
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Old 7th April 2008, 11:16 PM   #4
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err pp 6b4g's so 12 or 14W.

not too much.

my amp is in the picture along with cd player and passive pre.
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Old 7th April 2008, 11:38 PM   #5
MJK is offline MJK  United States
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The only potential problem I see with your set-up is that the FE-167E is 94 dB/W/m efficient and the Alpha 15A is 97 dB/W/m as predicted in infinite baffles. My original design targeted a 90 dB/W/m finished system efficiency with a smaller full range driver. You will need to be careful with the crossover to get them to blend and produce a flat SPL response. Maybe allow the FE-167E to run full range and only crossover the Alpha 15A so it helps offset the open baffle roll-off. Or maybe pad down the FE-167E a few dB and crossover both in the 200 Hz range similar to the original design with the FE-103E. The default set-up in my three driver OB worksheet uses the FE-167E and two Alpha 15A drivers and it is predicted to work extremely well (see the pdf on my Models page). If you can handle the level mismatch correctly, I think your system will be outstanding.
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Old 8th April 2008, 12:32 AM   #6
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Or as Martin's OB 3 model suggests, crossover bass at 200, fostex at 300 and pad down treble 5 db !

/Erling
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Old 8th April 2008, 12:51 AM   #7
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is that x-over points and padding down for 1 fe167e and 1 alpha15a per channel?

any ideas for what values of cap and inductor for the drivers?

or should i just use a notch filter on the fe1673 to reduce shout?

i want to filter the fostex for the bass.

listening right now i really do not feel that the fe167e is that more sensitive.

but padding down the fe167e might make it sound EVEN BETTER!!!
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Old 8th April 2008, 04:41 AM   #8
ronc is offline ronc  United States
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I totally agree with Martin. Please add an L pad.

ron
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Old 8th April 2008, 11:44 AM   #9
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Crossovers are Linkwitz-Riley 12 dB/octave. You can use the lowpass part from MJK's design. For highpass I suggest you use my values from 'The Volks-OB' :http://www.audiocircle.com/circles/i...?topic=46951.0 , 30 uF Obbligato capacitor and 8 mH inductor. Obbligatos are available from DIY Hi-Fi Supply and are really good and cheap: http://www.diyhifisupply.com/diyhs_ob_caps.htm. The L-pad could consist of 3.3 ohms in series and then 11.5 ohms over the Fostex, that should give an unchanged 8 ohm impedance for the crossover.

/Erling
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Old 8th April 2008, 01:20 PM   #10
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so for low pass use the 9mH and 68uF.

High pass use 8mH and 30uF. Use a l-pad of 3.3 and 11.5 ohms.

would these values work for my application?
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