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Old 21st December 2010, 02:39 AM   #1
syyma is offline syyma  United States
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Default Need help to pick a Chang plan

I ordered a pair of Pioneer B20FU20-51FW/Dayton ND20FA-6 combo and a handful of capacitors from PE recently. The full range always intriguing me for some time. I search the forum found several plans for the BOFU build. The Nelson Pass TL pretty easy to build but the depth of the enclosure is 20" and not easy to get the approval from the boss of the house. The BOFU BIB just way too big and tall. The Chang Family plans are very interest, praticularly the Half Chang, G Chang and Curvy Chang.

I use the Tubelab SSE to drive a pair of Dayton III MTM. I believe the SSE could capable to drives the Changs, or I might over estimate. Are there any sonic and sensitivity difference between these Changs? Any suggestions are more than welcome.

Regards,

Sidney
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Old 21st December 2010, 11:25 AM   #2
jimbro is offline jimbro  United States
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I'm no expert but I do know this size of your room and the listening distance play a major role. So give us your room dimensions please. Also if you search on any of the Changs you'll find lots of discussion on this. One option is to build mock-ups out of osb and try it for yourself.
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Old 21st December 2010, 03:07 PM   #3
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Quote:
Originally Posted by syyma View Post

I use the Tubelab SSE to drive a pair of Dayton III MTM. I believe the SSE could capable to drives the Changs, or I might over estimate. Are there any sonic and sensitivity difference between these Changs? Any suggestions are more than welcome.
I drive a pair of BOFU-equipped Half Changs, with my Tubelab SSE. The room is smallish (12'x15'), but I can't even come close to taxing the amp, even using the EL34 tubes that I use for most of my listening.
Do add the "helper tweeter", BTW. It makes a very noticeable improvement.
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Old 21st December 2010, 03:21 PM   #4
syyma is offline syyma  United States
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The room is 12'x19' with vaulted ceiling. I like the idea of OSB and seen one of the fellow member applied to the BIB.

Jimbro, I do have the Dayton Neo tweeters when I ordered parts from PE. Any pictures about your built?
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Old 21st December 2010, 03:24 PM   #5
Tom V is offline Tom V  United States
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Great minds think alike!!!

I too have just gotten delivery on my Bofu's and ND20FA tweets and am planning to build a half Chang, either straight or modified.

They will be shop speakers because I have run out of places for speakers upstairs!

Does anyone have a recommended (simple) crossover for the tweeters? In one thread GY Chang mentioned a 2.2uf cap in series with the tweet. Sounds right? Does the relative efficiencies of the Bofu and the Dayton play well together or is more required?

These will be driven with a T-amp, either a Sure, or the dirt cheap ($20) Lepai at PE.

Thanks!

-Tom-
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Old 21st December 2010, 05:07 PM   #6
jimbro is offline jimbro  United States
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My build is not finished yet. Kinda busy this time of year. On which wall will your system be? How far away from that wall will your ears be? As I understand it in order for the 2 mouths of the taller Changs to 'integrate' you need to be a least 10'-12' away. That's why I went with the half-changs in a slightly smaller room than yours.
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Old 21st December 2010, 11:34 PM   #7
syyma is offline syyma  United States
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which wall will your system be?
It will place on the long side of the wall.

HTML Code:
How far away from that wall will your ears be?
It will be about 8-9" away from the speaker.
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Old 21st December 2010, 11:58 PM   #8
jimbro is offline jimbro  United States
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I assume you meant ' (feet) not " (inches) . From everything I've read, it sounds like the half-changs would be the best choice. You better not be finished before me.
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Old 22nd December 2010, 02:52 AM   #9
syyma is offline syyma  United States
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Jimbro,

Oops, it just a typo I meant feet.

Where you going to mount your tweeter? Are you offset the reinforcement brace?
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Old 22nd December 2010, 10:42 AM   #10
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Originally Posted by Tom V View Post
Does anyone have a recommended (simple) crossover for the tweeters? In one thread GY Chang mentioned a 2.2uf cap in series with the tweet. Sounds right? Does the relative efficiencies of the Bofu and the Dayton play well together or is more required?
I used 2.0 uf, but 2.2 should work just fine.

The efficiencies of each component is such that I haven't seen the need for any more adjustment. It truly is a magical combination.
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