Half Chang build

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#441
As with BLH designs with rear firing mouths (such as the Buschhorn, Horn Shoppe, Austin, Frugelhorn, et al), I think you'll encounter boundary / corner loading effects. Indeed, the above class of designs specifically use the corner effect to complete the final section of expansion.

With any rear firing or bipole design you'd probably want to aim for reasonable symmetry of enclosure placement in relation to side / rear boundaries.
 
#442
thanks for the reply s

i might just be the first then.... but i have been looking on ways to improve the lower bass response.

keeping the speakers symmetrical in my room will pose no problems. but i plan on keeping them out of the corners.
 
#443
Hi
I am also a complete nube to DIY speaker building but do have some carpentry skills and wondered if I may ask for some opinons and advice.

I would like to build the HC's (the Full Chang is out do to their absolute lack of WAF) with either the Fostex FE207E, FE208ESigma or the FF225k. I'd like to include the Fostex FT96H super tweeter with whichever FR driver I choose. They'll be driven by a SET tube amp somewhere between 9-20 wpc depending on what I end up buying.

My room is 28'x14' with vaulted ceilings from 8' rising to 18' with hardwood floors. I listen to a wide variety of music with the exclusion of heavy metal & rap and only a little classical. I am a fan of strong vocals, particularly female. Do you guys think that I wlll be able to make this work, or am I mad to think so?

I have signed up for the Martin King worksheets and am trying to read as much as I can in the hope that at some point the varous measurements & charts will mean something to me!

Any and all advice you can give would be greatly appreciated.

Best reagrds,
Dave Atterbury.
 
#444
Of course it will work, and very well too -why on Earth would you be mad?

I designed it for the FE207E, so that would be the sensible choice of driver. The 208 & 225 are out, it won't work all that well with either, unless you Eq it (although admittedly most SET amps will go some way to providing that as they usually have quite a high output impedance). I'd still stick with the 207 though.
 
#445
atterbud,

The guys designing these speakers are light years ahead of the local hifi store, if you want good full range speakers, use the recommended driver and follow the plans and you won't be disappointed. If you deviate, you are on your own. Don't worry, the results will be good.

Ian.
 
#446
thanks to all

many thanks to all on this thread who have contributed their time, their expertise, and their enthusiasm to enable me to complete my project - 1/2 CH with B20, and the Dayton/PX cheepies with 2uf caps as per GY Chang - recently put them in my daughter's apt and was extremely pleased with the outcome, fit, finish, and non-technical listening experience all very satisfactory...again, heartfelt thanks to all...
happy holiday,
jorge
 

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#448
Ian444 said:
atterbud,

The guys designing these speakers are light years ahead of the local hifi store, if you want good full range speakers, use the recommended driver and follow the plans and you won't be disappointed. If you deviate, you are on your own. Don't worry, the results will be good.

Ian.
Click to expand...

Your speaker looks very professional indeed, looks excellent. My contribution here is minimal I happened to hit on the combination of the Dayton tweeter (was cheapest I found at that time around $4... but now higher) with the B20 by pure luck.

Main credit should go to Scottmoose, Dave at Planet10, who comes out with the science and practical way to distribute the knowledge to the street guy level.

gychang
 
#450
gychang said:
Your speaker looks very professional indeed, looks excellent. My contribution here is minimal I happened to hit on the combination of the Dayton tweeter (was cheapest I found at that time around $4... but now higher) with the B20 by pure luck.

Main credit should go to Scottmoose, Dave at Planet10, who comes out with the science and practical way to distribute the knowledge to the street guy level.

gychang
Click to expand...


thanks gy...call it serendipity, call it what you will, nevertheless, i value your contribution as i value scottmoose dave's technical expertise, and the cumulative knowledge of all who post here - we, the street guys are the grateful beneficiaries - again, many thanks to all...

jorge
 
#451
Sorry for this simple question, but ive seen many different types of internal padding in this thread. Im planning to build a pair of these with 207 drivers very soon and just wanted to clarify what would be best in terms of internal padding. What type of material should be used, how thick and where should it be placed?

Thanks
 
#452
beauistheman said:
Sorry for this simple question, but ive seen many different types of internal padding in this thread. Im planning to build a pair of these with 207 drivers very soon and just wanted to clarify what would be best in terms of internal padding. What type of material should be used, how thick and where should it be placed?

Thanks
Click to expand...

I used "felt carpet padding" from my local home center. It might be called "wool underlay" or something similar. It isn't really wool felt, but a synthetic material about 1/2" thick. I covered the top, one side, and the back.
 
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