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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. |
2 Attachment(s)
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NEAT!
How much power are you giving 'em? Look forward to hearing your thoughts once you get the crossover in... |
err pp 6b4g's so 12 or 14W.
not too much. my amp is in the picture along with cd player and passive pre. |
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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Or as Martin's OB 3 model suggests, crossover bass at 200, fostex at 300 and pad down treble 5 db ! ;)
/Erling |
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!!! |
I totally agree with Martin. Please add an L pad.
ron |
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 |
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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