Speaker enclosure build - 6.5" full range drivers

[aoc]

Darrylis,
Here is some finishing material http://www.parts-express.com/brand/vvivid-vinyl/631?N=4294961668+4294967118&No=0&Nrpp=16&Nrs=collection%28%29%2Frecord%5Bendeca%3Amatches%28.%2C"P_PortalID"%2C"1"%29+and+endeca%3Amatches%28.%2C"P_Searchable"%2C"1"%29%5D&PortalID=1&brandSelected=t

Alex

 

[GM]

VViViD Vinyl -- Premium film vinyl wraps for automotive, architectural, and custom speaker projects

Sweet! Wish that had been available 30-50+ yrs ago........

GM

 

[darrylis]

aoc,

Your link doesn't work.

 

[GM]

GM,

Thanks for the input, you've been really helpful. Will start putting together the materials. BTW, please explain what this means "two out three of an acceptable room ratio".

You're welcome!

Rectangular rooms ideally need to be sized to average out its eigenmodes, such as 1.0:1.17:1.47, so you could use driver/baffle offsets and/or width/depth of [ML]TLs or similar: 1/1.17 = 0.855:1.00 or 1/1.47 = 0.68:1.00.

The golden ratio is of course 0.618:1.00 and 1.000:2.618 = 0.382:1.000.

Googling gets you a lot of acceptable room ratios, the math to calculate your own to see how close your preferred location is to one: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=acceptable room ratios

........with the best known here: Room sizes compliance with international standards and recommendations

GM

 

[GM]

aoc,

Your link doesn't work.

The one in my previous post does.

Note that links 'usually' are fine when you view them in a quote, so just highlight it and either make it a link in a new post or let Google open it to view and save it to [re]post as I did.

GM

 

[darrylis]

Folks, I saw references on the web regarding a customizable port i.e. a port opening whose size can be changed on the fly to suit the room/preferences/environment etc. Is there an easy way to accomplish this (say with wood or something I can purchase) ? I looked on the web, but not easy to find, as I may be using the wrong jargon.

 

[chrisb]

something like this?
Speaker Cabinet Port Tube 2" ID Adjustable

that's easy enough to achieve with plastic tubing, a bit more of a challenge with wood.

 

[darrylis]

chrisb,

Thanks for the link, however, I saw that earlier as I was looking into it. I'm wondering if that customizable port can be changed constantly when moving from one environment to another ? Or once a design is settled upon, the port length/size should be fixed i.e. with glue or whatever ?

This is what I'm talking about for lack of a better way to describe it (it was a design by Dan Neubecker called Chamelions). This is how it is described:

Flexport Technology:With the turn of a knob, via an adjustable slot port, the speaker can be set to sealed or ported with a box tuning range of around 42hz-55hz, on the fly, as you listen. As a result, they can be tuned for various rooms or positions in the room, to music and listening preferences or for use with or without a subwoofer.
(source: Midwest Audio Fest 2012 - The premier gathering for audio enthusiasts featuring Speaker Design Competition, Auto Sound Challenge and Parts Express Tent Sale)

Here is a video demo of it at approx 1:13:
https://www.parts-express.com/Video.aspx?VideoID=1437

 

[darrylis]

GM,

Thanks for your note, I've been reading up on those links. Seems like there isn't and end to what can affect/constrain the design. I may have to keep this build simple as it is my first shot at it.

 

[GM]

Hmm, RCA offered a sliding plate over a large rectangular vent circa '50, later adding a slider level mechanism to improve cosmetics used until circa '67 when big, tall cabs pretty much disappeared from the consumer's lexicon.

Seems like one could adapt this to a knob adjustable vent: https://www.google.com/patents/US20110176701

GM

 

[GM]

GM,

Thanks for your note, I've been reading up on those links. Seems like there isn't and end to what can affect/constrain the design. I may have to keep this build simple as it is my first shot at it.

You're welcome!

Yep, the physical world is nothing if not complex, so one pretty much always has to choose from a host of compromises when trying to manipulate/control it and thankfully the KISS system [keep it simple, stupid] works well enough most of the time.

GM