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Old 2nd March 2013, 03:32 PM   #971
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Since I've been in the single driver, low wattage amplifier camp for some 3 to 4 years now , i've gained alot of fidelity in my sytem . This Frugalhorn , voigtpipe venture has seemed to have advanced that fidelity greatly although sadly my voigt pipes (no H) were destroyed in a fire . the frugalhorns filled in nicely despite the second set of fostex"s that fell to improper EnABL information I recieved . With the FE126en being the most sensitive and easiest to drive with my 2.3 watt SET"s I just wonder if theres anymore work to do on these cabinets. also in a small room 9x13 with corners. What is the advantage of baltic birch over MDF??? The cabinet itself is not perfectly cut ,no CNC here,just the best I could do with the tools I have . I even drew the print dimensions on the outside of the side pieces 18mm. also used quarter inch cork up the whole front baffle , so this is a work in progress like this whole site is . And some great sound its producing. I plan building more of these whether out of expensive baltic birch 13 ply marine quality, or just MDF!!!!!!! They were a fun build . easy. Try to keep things in laymans terms we are not all PHD's. Thanks

Last edited by kevner1954; 2nd March 2013 at 03:35 PM.
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Old 2nd March 2013, 04:27 PM   #972
Toppsy is offline Toppsy  United Kingdom
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The debate of Batic Birch Ply verses MDF will go on forever me thinks with both sides of the camp championing one over the other.

For large cabinets I am in the opinion that BBP is superior in performance over MDF. Especially in such designs were the larger sized drivers exert more energy over the smaller FR divers. In the likes of the FH3 which are quite small and well braced I have found no benefit in using BBP over MDF, as long as you use quality 18mm thick MDF. I must say though that the price difference between 18mm BBP and 18mm MDF here in the UK is around 20 (UKP). and if you use 15mm BBP aound 14 difference. So not a lot if you factor in the O/A cost of the speakers.

I have built and compared both BBP and MDF FH3's fitted with the same drivers and honestly cannot hear any sonic difference in sound.

I'm sure there are others that will disagree with my findings but we are talking small 4" FR drivers here and they do not exite the cabinets in the way say a larger 8" mid-woofer does.
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Old 2nd March 2013, 05:26 PM   #973
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Thanks for that Toppsy, the only thing thats annoying about MDF is the dust at cutting requires partical masks. The knuckle rap test gives me assurance that the cabinet is solid too. thanks again
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Old 3rd March 2013, 11:15 AM   #974
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A few more questions , and maybe they're answered in the other 972 threads. with the drivers sensitivity do we gain any more in this cabinet, sensitivity that is . and frequency response, and this may be damping dependent . as far as the FE126en is concerned. youve already dazzled me with brilliance now baffle me with BS.??????? thanks
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Old 3rd March 2013, 06:46 PM   #975
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The horn can only provide efficiency gains within its bandwidth (<~300Hz) so no BSC is required. The efficiency ends up as that of the driver in the mid0band.

dave
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Old 8th March 2013, 09:36 PM   #976
tlarwa is offline tlarwa  United States
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Default Efficiency with MA CHP-70eN ?

I'm curious what the efficiency rating is of my FH3's. I'm using enabled CHP-70 drivers. Any idea? I'm driving them with an MP-301 amp at 6W, and while they sound great, I'm starting to crave a little more oomph.

Tom
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Old 8th March 2013, 09:44 PM   #977
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Quote:
Originally Posted by tlarwa View Post
I'm curious what the efficiency rating is of my FH3's. I'm using enabled CHP-70 drivers.
Tom,

The same efficiency as the CHP drivers. The horn only gives gain in the LF area.

dave
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Old 9th March 2013, 03:30 AM   #978
tlarwa is offline tlarwa  United States
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Can you tell me what that is? I looked and didn't see it. Maybe I'm not sure what I'm looking for
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Old 9th March 2013, 03:42 AM   #979
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From the data sheet, 86.5 dB/1 watt

dave
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Old 9th March 2013, 03:05 PM   #980
tlarwa is offline tlarwa  United States
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What can I expect the differences to be if I try the Fostex Fe126En in place of the CHP-70eN drivers I have installed now? Both in terms of efficiency (I'm driving them with a 6W tube amp) and in sound characteristics? I'm looking for more SPL, but not at the expense of SQL of course. My room is 12' x 17' and while it gets loud enough, I sometimes feel the need for more power to adequately support the music. The other option, of course, is to buy a more powerful amp. I will do that at some point, but that's a much more costly alternative!

Thanks,

Tom
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