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I made wrong version of Cubo15

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Category: Plans
Forum Name: Other plans
Forum Description: Discussion / Questions about all the other plans
URL: https://forum.speakerplans.com/forum_posts.asp?TID=106074
Printed Date: 26 March 2026 at 6:51pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com

Topic: I made wrong version of Cubo15

Posted By: nemo
Subject: I made wrong version of Cubo15
Date Posted: 13 February 2021 at 5:24pm

Hi everyone!

Sorry if I make a linguistic mistake, I'm learning English.

A few years ago I build Cubo 15 STANDARD, and I used a driver where Qts x Vas = 50.3

So I should make a Cubo Extended or Extra Extended due to:

Qts x Vas > 120, Cubo Standard

Qts x Vas = 100 - 120, Cubo Extended or Standard

Qts x Vas < 100, Cubo Extended

Qts x Vas < 50; Cubo 15 Extra Extended

Anybody tell me a general difference between the Standard and Extended version when I use a driver which has Qts x Vas = 50.3 ?

I guess that this affects the frequency response, but how?

What else?

Thank you! :)

Replies:

Posted By: bass*en*mass
Date Posted: 13 February 2021 at 7:04pm

the extended versions are tuned lower in freq., which leads to a smaller+lower bandwidth by design - the lower they are tuned, the "weaker" the driver could be without having much of a negative impact on the natural response/bandwidth/they are more forgiving re. TSP.

Posted By: nemo
Date Posted: 14 February 2021 at 11:30am

Thank!

Compared to the vented box, I understand it like this: I made a port too short in a vented box, so for example f3 is on 50hz level but I should make a longer port to obtain f3 at 40hz level to obtain the correct and the best freq response.

So if I want to obtain lower bandwidth in my Cubo I should remake it from a Standard to an Extended version, yes?

Posted By: bass*en*mass
Date Posted: 21 February 2021 at 10:17pm

with your driver, extra extended might be best..

if you post what driver it is exactly it would help.