Speaker Asylum

I looked in Bullock, Beranek, and Marshall Leach and couldn't find anything.

99.16.141.181

andy_c

In Reply to: RE: No one knows? posted by Timbo in Oz on June 13, 2012 at 16:01:02

It makes sense what you're saying though.

Sounds like a DIY project. Is the vent removable such that you could just measure the box tuning frequency via voice coil impedance measurements and tweak the vent length to get it to the desired value?

Follow Ups:

Neither could I, once I found my Bullock! - Timbo in Oz 16:29:18 06/13/12 (2)
Andy,

It is a DIY project a 3-way column with two bass enclosures, BUT ... the enclosures were OEM'd, concrete spheres. ?*

The ports (PVC plumbers pipe) are cemented in, so all I can do is turn one pair over (on the blocks I have made) onto a 24inch round paver and measure how deep they go.

If I decided to tune the down-facing pair lower I'd not be going any lower than 2/3rds the Fs of 38hz = 27Hz. A right-angle bend to fit over the back end of the port is a snap. How low will depend on what effect the acoustic loading has. May not have to retune.

* the second matching pair of spheres? one of each will sit on top of a down-facing sphere. ???? Cut-down basketball hoops on an adjustable column on rollers, and gravity will hold them in place, plus a small ball of blutak.

The third smaller sphere on top running from ~400-6kHz will be mounted in the same way. Moving them will be doable, as will be working on them.

Note that a post in response is preferred.

Warmest

Timothy Bailey

The Skyptical Mensurer and Audio Scrounger

And gladly would he learn and gladly teach - Chaucer. ;-)!

'Still not saluting.'
- Concrete spheres? Holy moly! - andy_c 16:39:14 06/13/12 (1)
  I was trying to picture what each complete system would look like, and then I thought... a snowman? Would be interesting to see pics of these.
  - When I'm happy, yes I'll report - Timbo in Oz 17:08:10 06/13/12 (0)
    It will be tri-amped.
    The current single pair in use is biamped.
    
    Note that a post in response is preferred.
    
    Warmest
    
    Timothy Bailey
    
    The Skyptical Mensurer and Audio Scrounger
    
    And gladly would he learn and gladly teach - Chaucer. ;-)!
    
    'Still not saluting.'
    - the current system (Open in New Window)
    Edits: 06/13/12

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Amplified Parts