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Old 11th October 2007, 05:14 PM   #21
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>>> I'll move them upstairs later...

Good luck!

Moving BIBs, back horns and pipes from my garage to my basement and finally into the rooms they were intended is a back breaking task.

But it's worth it of course! When i bought my new car i measured to make sure it would fit a typical BIB.

The Chang is a wild looking design! The Half-Chang is more typical of traditional back horns and quite handsome.

Scott, i was curious how you came up with the size of the top part of the cabinet. It's basically a 1.7 cubic foot slotted cab... but slotted into a large mouth. Sorry if i missed an explanation in an earlier post.

Thanks,
Godzilla
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Old 11th October 2007, 06:19 PM   #22
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I make no bones about it -these boxes were started as extremely simple fun boxes that took all of thirty seconds to design & sim (it helps that I've been working with BVRs for the best part of two years of course ). The upper box is in fact the Fostex Factory FE206E BR cabinet, with the driver repositioned & a completely different approach to the vents. I kid thee not. I designed the cabinet for the 206/7, so I figured why reinvent the wheel when a box of the 45litre volume I needed & of HxWxD dimensions ideal for my needs was there, just waiting for me to do evil things with it.
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Old 11th October 2007, 09:39 PM   #23
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Okay, they're connected to the Squeezbox and the Amp10 now and I've been flipping through a lot of different music for an hour or so.

Click the image to open in full size.

Here are some initial impressions (big caveat here - I am in no way an "audiophile". These are only my second pair of DIY speakers, the first being the Cyburgs Needles a couple of months ago. Before that I had a Cambridge Soundworks Ensemble II sub-sat system that left a lot to be desired. All my impressions are based on that experience only. Also take note that one side is simply clamped; there is no damping in the horn void, and the FE206s are still going to get puzzlecoat/phase plugs at minimum.)

Overall these are MUCH more efficent than the Needles (87db vs. perhaps 92-3db with the series resistance). I'm using lower volume settings and getting more sound - not surprising considering there's at least twice as much speaker volume.

LF is excellent - I will definitely retire the sub-woofer I had been using with the needles. Bass is musical and clear. This is not HT earth-rumbling and for my purposes that's very good.

Midrange is strong and detailed. This , I think, contributes to the much improves sound stage. Listening to live recordings (Tom Waits, Bill Evans) even with the less than ideal speaker placement right now reveals good location of instruments, vocals, background chatter, etc. I'm really looking forward to listening once these are tuned into the room some more.

High frequencies are still a bit much for me. It may be that they still need more break-in, or more (different?) damping, or the upcoming puzzlecaot/phase plugs, or EnABLing. Or it could be that I just need to get used to them. I suspect it's some combination of the above.

If it doesn't lead to marital strife, I'll leave them in place for a day or two and just listen. Until I do the puzzlecoat/phase plug mods I'm hesitant to change the damping, though with the side just clamped it's easy to fiddle with it if I get antsy.
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Old 11th October 2007, 09:48 PM   #24
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They look great! If you have kids tell them to be careful of the clamps please.

I really want to compare the 206e, 207e and B20 in these cabinets. I'm sure they will all sound different... but all very good.

Great picture too!
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Old 11th October 2007, 10:01 PM   #25
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Excellent work! You should be proud.

Gary
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Old 11th October 2007, 10:30 PM   #26
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Nice... I like. Oh yes.

Highs too strong for you? Phase plugs are your friend. Some more damping in the chamber wouldn't go amiss either -that cork is unlikely to be enough. I'd get some wool underlay, and cover the top, back and one side to start with & adjust from there. Should help smooth things out a little.
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Old 11th October 2007, 10:37 PM   #27
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Thanks all... no little kids (she's 30 this year and off on her own for quite a while now). I re-arranged the clamps after that photo to get them aimed away from traffic, though.

I'd be happy to take donations of FE207s and B20s - just send them and I'll try them .

Thanks especially to Scott and Dave for their designs, help and advice.

A bit more concerning the HF. I realized that I hadn't adjusted to the increased efficiency and was playing them fairly loud. Once I brought the volume down a bit some of the HF shout and harshness tailed off. I think that part of the problem is with my room(s). The ground floor of my house is semi-open space. You can see the ceramic tiled foyer to the left in the photo and just to the right of the bookcase in the photo, the wall opens up 11 feet into the dining/kitchen area, with all cherry flooring throughout. Looks like once I settle the driver mods I'll be suggesting to my wife that we consider some nice fiber art for the walls.
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Old 11th October 2007, 10:43 PM   #28
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bobtrancho,

If you feel that the high frequencies are a little shouty you could try a BSC filter to tame them a bit. I have a variable BSC filter in the basement that I put together for Jim Shearer to try on his Metronomes. The circuit can be inserted in the positive speaker lead outside the enclosure without any changes to the speaker or the rest of your set-up and is completely reversible. If you want to give it a try let me know, I live a few miles south in Clifton Park at Exit 8 of I-87.
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Old 11th October 2007, 10:54 PM   #29
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Quote:
I have a variable BSC filter in the basement that I put together for Jim Shearer to try on his Metronomes. The circuit can be inserted in the positive speaker lead outside the enclosure without any changes to the speaker or the rest of your set-up and is completely reversible. If you want to give it a try let me know, I live a few miles south in Clifton Park at Exit 8 of I-87.
Martin,

Thanks for the generous offer. I could see that we were "neighbors" from your profile. Let me settle my other issues (damping, driver mods, speaker placement) first and then, if I'm still unhappy with the high frequencies, I will certainly take you up on your offer. Heck, even if I don't think I need the BSC you're welcome to come by for a cup of coffee sometime!
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Old 11th October 2007, 11:46 PM   #30
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Quote:
Let me settle my other issues (damping, driver mods, speaker placement) first and then, if I'm still unhappy with the high frequencies, I will certainly take you up on your offer. Heck, even if I don't think I need the BSC you're welcome to come by for a cup of coffee sometime!
That would be great. I would be very interested in hearing the Fostex driver and a design like the one you built. If your interested, the invitation to come and hear my Lowther OB is always open.
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