Does Port Length Really Matter?

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silby101

Member - Posts: 2

Joined: October 18, 2004

Location: Canada

Posted: October 18, 2004 at 12:47 AM / IP Logged

I am designing a box for 2 JL 10" subs and have a question. Does port lenght really matter? I ask this since all the things I read say that you should use the calculators or the manufactures suggested lenghts but here is the problem.

Bose wave radios work on a design which is one huge port. I have one and it's amazing. The bass that I get from these 2.5" speakers are amazing. But the port lenght is just as long as what is suggested for my 10" sub. So what gives? Does a longer port take away from the bass or enhance it? Bose gives the analogy of a whisper in a flute can fill up a concert hall with sound. Small movment but a long focusing chamber or port. What are some peoples ideas about this?

Thanks for the input!

Francious70

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Joined: July 26, 2004

Location: United States

Posted: October 18, 2004 at 1:48 AM / IP Logged

Don't believe what BOSE says. It's all marketing hype.

Don't believe me?? Check this out.

BOSE Acoustimas Review

Or this.

http://www.audioholics.com/forums/showthread.php?t=3266

Paul

Steven Kephart

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Joined: November 06, 2003

Location: Oregon, United States

Posted: October 18, 2004 at 2:45 AM / IP Logged

The problem is that Mr. Bose doesn't have an engineering degree. He has a marketing degree. They make the cheapest possible stuff and market it to make people think they are getting something incredible for their huge sums of money. And they are hugely successful at it. I could let you listen to our cheap $150 kits and you would be blown away by how much better it sounds than the wave radio, or anything Bose makes for that matter.

Steven Kephart

Adire Audio

outtaluck72

Copper - Posts: 155

Joined: August 04, 2003

Location: United States

Posted: October 18, 2004 at 7:19 AM / IP Logged

they say it's not really the size that matters, it how you use it. Sorry, I had to say that. Does Port Length Really Matter? -- posted image.

DYohn

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Joined: April 22, 2003

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Posted: October 18, 2004 at 8:20 AM / IP Logged

Port length is a critical part of what determines the tuning frequency for the enclosure. Yes, port length matters.

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haemphyst

Platinum - Posts: 5,059

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: October 18, 2004 at 9:16 AM / IP Logged

Also, the Acoustimass system is NOT a ported system. It is a quasi-transmission line. Look it up, I don't want to get into it right now - too early. Does Port Length Really Matter? -- posted image.

(Also, it's a HUGE chunk of ****, and Dr. (yes, he's got a label) Bose saw you and a million other "audiophiles" coming - sorry, man) Seriously, though, if you like it, keep it. It's just that I disagree with the company, and they would never get a dime of my money, and their systems sound awful to me.

Bose uses over 80% of their annual revenue for MARKETING. It is the only company on the face of the planet to do so, and because it is a small company (employee-wise) they can still afford to do this.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Steven Kephart

Platinum - Posts: 1,737

Joined: November 06, 2003

Location: Oregon, United States

Posted: October 18, 2004 at 11:24 AM / IP Logged

haemphyst wrote:

and Dr. (yes, he's got a label) Bose saw you and a million other "audiophiles" coming - sorry, man)

That's right, it was Doctor. I think it was our Doctor that told me that it was in marketing, not engineering.

But anyway as they said, if you like it then ignore what we say about the company. You have a product you enjoy, and that's all that matters.

Steven Kephart

Adire Audio

tbirdman74

Copper - Posts: 164

Joined: August 22, 2003

Location: United States

Posted: October 18, 2004 at 11:35 AM / IP Logged

Amen to the Crap, err.. Bose opinions. But back to port length as DYohn said, port length is critical to tuning the frequency of your enclosure. Ported boxes can sound amazing if they are properly contructed and tuned. The only problem is that it only takes a little miscalculation to screw up a days work, so build it carefully.

If it don't fit, Force it.

If it breaks, You needed a new one anyway!

chrane

Member - Posts: 27

Joined: October 18, 2004

Location: Canada

Posted: October 18, 2004 at 12:27 PM / IP Logged

yes port length matters alot. length and width and port displacement (air volume inside the port) in calculated ratio to the volume of air and the theile small parameters of your speakers determins the tuning frequency.... with the BOSE system you are talking about they are trying to mimic a "transmision-line" box... thats a whole nother storry, if you dont know about tuning frequencies dont bother trying to understand what a trans-line box is

Aaron

gus1

Gold - Posts: 1,013

Joined: October 15, 2003

Location: Canada

Posted: October 18, 2004 at 1:42 PM / IP Logged

Ahh... BOSE. "Better Sound Through Propaganda" However, there are a lot of interesting physics going on in behind the advertising. Their home audio kinda sucks... but, head over to the commercial side of things. Hook up a Panarray system, feed it with 2.5K RMS of good clean power, and listen to it hammer. As a live audio tech, I have used a lot of their commercial stuff, and, when properly deployed, it works exactly as it says it does. Good dispersion, good pattern control, decent fidelity. Not saying it's the best stuff out there, but it isn't the worst either.

Gus

Wherever I go, that is where I end up......

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