Thanks Scottmoose. I will take your word for it because I follow what everyone else is doing, you have great knowlege about this subject.
I was thinking of using a different material for the front baffle. 1/4" T6061 aluminum with some dampening material to control reflection on the inside and outside if needed. Cleat mount the front baffle for easy mods. I think the aluminum is much stiffer then ply. Back mount the speaker and cut a 1/4"bevel for the speaker. What do you think?
Peter C.
I was thinking of using a different material for the front baffle. 1/4" T6061 aluminum with some dampening material to control reflection on the inside and outside if needed. Cleat mount the front baffle for easy mods. I think the aluminum is much stiffer then ply. Back mount the speaker and cut a 1/4"bevel for the speaker. What do you think?
Peter C.
while not Scott, I'd opine that the aluminum would work very well as proposed and is thin enough that beveling would not be necessary
I don't have any materials density charts etc. to hand with MOE values (what I had was on an old Zip disc, long since dead, along with the drive), but something like 12ga CRS would make a fantastic box, & I see no reason why aluminium should not do the same. Rings like a bell, but so far out of the box's functional BW it will be very easy to damp. Go for it. 🙂
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Hello chrisb: The 6061 1/4" is nice stuff to work with. It can be cut with a circular saw with a carbide blade. The beveling is to make it look good.
Scottmoose: Thank you for the "Go for it"
-Rings like a bell, but so far out of the box's functional BW - Sorry, but I don't know what functional BW means.
I plan to use the brace and screw the aluminium to it with 1/32" black rubber between the brace and the baffle to act as a bit of a anti ringing system. I am still planning as I have other things to do, but the planning stage of this Chang is lots of fun. See what everyone is doing and using ideas to combine them into something what I will be proud to build.
Peter C.
Scottmoose: Thank you for the "Go for it"
-Rings like a bell, but so far out of the box's functional BW - Sorry, but I don't know what functional BW means.
I plan to use the brace and screw the aluminium to it with 1/32" black rubber between the brace and the baffle to act as a bit of a anti ringing system. I am still planning as I have other things to do, but the planning stage of this Chang is lots of fun. See what everyone is doing and using ideas to combine them into something what I will be proud to build.
Peter C.
Providing they are outside the cabinet's operating BW, it doesn't matter if the material has strong resonant modes, since there won't be anything to excite them.
1/4" 6061 is nice. Machines easily, takes as nice a finish as you want - from brushed to mirror. Not the cheapest stuff in the world. While other alloys are more expensive, 6061 will still make baltic birch look like a bargain.
A 10" X 34" X 1/4" plate is 85 Canuk Bucks. The ply is, depends from where I buy it from, $80 to $120 4' X 8' X3/4" sheet in Toronto.
First I will make the cabs. without the baffle then take precise measurements of the opening to fit the baffle. I presion cut the plate to fit. In case of offsets. With cleat mounts I can change the baffle to other materials as suited.
Nice to see input!
Peter C.
First I will make the cabs. without the baffle then take precise measurements of the opening to fit the baffle. I presion cut the plate to fit. In case of offsets. With cleat mounts I can change the baffle to other materials as suited.
Nice to see input!
Peter C.
if using a 207 fostex speaker with a fostex FT17H tweeter, what sort of crossover is recommended to start at? 2uf?
I would also like the plans for this but everytime i try the link i get handbag websites, i think it has been hijacked, could we try again please or just post a link without linking if you see what i mean? regards, Nick
Respectfully disagree, a tube amplifier with the small Karlson with FE-166En (that I built many years back) gave chest thumping bass. The cone hardly moves. Kids now have them with a solid state amplifier and could not be happier (combined with enabled FE-127E for mid-high). At the moment I am listing to the FE-167E with an Audio Note push pull clone and am more than happy.
AM
20 July 2008!!!!!
My opinion has not changed. I use a wide-range 4" over an 8" woofer. The bigger the wide-range, the more dispersion (lack of) problems you get.
Bob
My opinion has not changed. I use a wide-range 4" over an 8" woofer. The bigger the wide-range, the more dispersion (lack of) problems you get.
Bob
Hi guys,
Did someone compared sounding of Half Chang and Dallas II enclosures?
Obviously both with the same driver, preferably Fostex FE206en.
Did someone compared sounding of Half Chang and Dallas II enclosures?
Obviously both with the same driver, preferably Fostex FE206en.
Probably not; note that the former was not designed for the FE206E[n] -those were merely option drivers that requires some series R or an amplifier with a high / adjustable output impedance for proper function. Beyond that, since the alignments and design goals are fundamentally different, comparisons in essence simply illustrate that, i.e. they're different. Technically Dallas II is a superior design for the 206, at the price of greater size and complexity.
Hi Scottmoose,
thanks for swift response. I'm entirely aware, that Half Chang was initially designed for FE207, however after reading all this thread I expect to get good results with FE206en, obligatory with BSC circuit.
The amplifier I have is tube EL84 based and has 4 and 8Ohm outputs.
The reason why I'm looking at the Half Changs is that they are more slender that other projects, which are in majority too huge for my room.
Are you able theoretically compare Half Chang and Dallas II in terms of sound quality and attributes?
thanks for swift response. I'm entirely aware, that Half Chang was initially designed for FE207, however after reading all this thread I expect to get good results with FE206en, obligatory with BSC circuit.
The amplifier I have is tube EL84 based and has 4 and 8Ohm outputs.
The reason why I'm looking at the Half Changs is that they are more slender that other projects, which are in majority too huge for my room.
Are you able theoretically compare Half Chang and Dallas II in terms of sound quality and attributes?
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FE207E rather than the FE207 (a slightly earlier driver).
A baffle step compensation (low pass shelving) circuit is not obligatory: as noted though, some series R or a high / adjustable output impedance amplifier is, for the alignment to work roughly as designed. Baffle step isn't a major issue with this enclosure if it's near room boundaries, although the same circuit topology can be used to flatten the naturally rising HF response of the 206E[n] (separate issue).
Unfortunately not, since sound quality is subjective until it's defined technically. So it depends how you define it in terms of, say, frequency response, distortion, acoustic efficiency &c. Dallas II is the more efficient load & operates over a significantly wider BW, with all that entails.
A baffle step compensation (low pass shelving) circuit is not obligatory: as noted though, some series R or a high / adjustable output impedance amplifier is, for the alignment to work roughly as designed. Baffle step isn't a major issue with this enclosure if it's near room boundaries, although the same circuit topology can be used to flatten the naturally rising HF response of the 206E[n] (separate issue).
Unfortunately not, since sound quality is subjective until it's defined technically. So it depends how you define it in terms of, say, frequency response, distortion, acoustic efficiency &c. Dallas II is the more efficient load & operates over a significantly wider BW, with all that entails.
Hi,
thank you for clarification.
As to the sound quality/attributes, I had in my mind i.e. FR linearity, audible stage effect depth and width.
I'm aware that your impression might be just theoretical. I just want to know whether Half Chang is able to present full performance of FE206en.
Alternatively maybe you could suggest some other well performing enclosure for this speaker, similar to the HC in terms of dimensions.
thank you for clarification.
As to the sound quality/attributes, I had in my mind i.e. FR linearity, audible stage effect depth and width.
I'm aware that your impression might be just theoretical. I just want to know whether Half Chang is able to present full performance of FE206en.
Alternatively maybe you could suggest some other well performing enclosure for this speaker, similar to the HC in terms of dimensions.
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I have half changs with fe206ens and my wife and I are both wowed by the sound. No sub needed at all. A quick search will yield similar experiences. I'd like to try them in dallas IIs but life keeps getting in the way. It's always something. Are your drivers broken in? If not, expect not to like it for the first 100 hrs or so.
Hi jimbro,
Thanks for sharing your opinion. I bought my drivers as used, so I suppose that they have aleady been turned over.
Thanks for sharing your opinion. I bought my drivers as used, so I suppose that they have aleady been turned over.