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Re: i wanna feel the bass! [message #37334 is a reply to message #37315]

Mon, 15 July 2002 19:31

BillEpstein
Messages: 886
Registered: May 2009

Illuminati (2nd Degree)

If you search the archives for Titanic you can read the several posts between Wayne, Adam and myself re: the Titanic 12. The spec I finally used as recommended by Wayne:
PiAlign parameters then, are 9.89 cu. ft., 16Hz and 2.45. The cabinet PiAlign recommends is 4.0 cubic feet tuned to 15Hz with a 3.3" long x 1.6" dia cylindrical port or a 3" x 1.8" x 3.3" long rectangular port. This makes a nice flat response curve with -3dB at 25Hz, -6dB at 20Hz and -12dB at 15Hz.
You do really feel the bass and a candle held in front of the speaker or the port will blow out. (Okay, I was bored) But it's also musical, never calling attention to itself but really filling out the tracks on the Diana Krall "Live" DVD.
WTFDIK

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Re: You've got mail! [message #37336 is a reply to message #37325]

Mon, 15 July 2002 22:15

Wayne Parham
Messages: 18845
Registered: January 2001

Illuminati (33rd Degree)

PiAlign recommends this small box too. It provides excellent performance, but deeper bass response can be obtained using a larger box and different alignment. There are a handful of systems I've done this way; We recently discussed this on the post called "Omega Pro 18, Box Volume". Basically, all of my bass reflex speakers containg 18" woofers are designs to maximize extension, because I expect they will be used as subs and where deep bass response is top priority.

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Re: how big is the box [message #37338 is a reply to message #37333]

Tue, 16 July 2002 06:02

Adam
Messages: 419
Registered: May 2009

Illuminati (1st Degree)

Ohh.... You can't do that for those woofers. They don't have the frequency response.

These are for sub duty only.

Sorry, but it's nearly impossible to get good frequency response from 20-1.5 kHz from one driver :(. Very very difficut.

Adam

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Re: how big is the box [message #37343 is a reply to message #37331]

Tue, 16 July 2002 15:16

Jerry Parker
Messages: 58
Registered: May 2009

Baron

I personally have a Blueprint driver, the 1803. Their new website is www.missiondigital.net Yesterday I got its excursion up to around 3" peak to peak. It was WELL below tuning, 12hz, which I believe is the resonant frequency of the human body, otherwise with the low power I am giving it, I would never been able to make it excur so much.

Anyways, its really low efficiency. 93dB 1w/1m and has the cone area of a 15" speaker, yet the frame is for an 18" the surround is so large. It would match up well with a pair of Pi speakers, but only if you had 1kW or more going to the 1803.

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