X10, X12, X15 and XM15 - x12 ohms help

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x12 ohms help

Printed From: Speakerplans.com
Category: Plans
Forum Name: X10, X12, X15 and XM15
Forum Description: Discussion / Questions about the X10, X12, X15 and XM15
URL: https://forum.speakerplans.com/forum_posts.asp?TID=31213
Printed Date: 27 March 2026 at 7:15am
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Topic: x12 ohms help

Posted By: Barrington
Subject: x12 ohms help
Date Posted: 02 October 2009 at 11:32am

I have just built two x1 (15") subs and that is my only experience. I am planning to start building a pair of x12's for my year 12 major work. Just wondering about roger mogales x12 design. Whats the impedance (ohms) for each enclosure? Also, are the speakers/tweeters used in it 8ohms?

Need to know asap as I will be ordering the parts really soon. I wont be using the exact same speakers and stuff as used in the design, il be using cheaper eminence or selenium stuff as that is all I can afford.

Help will be greatly appreciated!

Replies:

Posted By: imageoven
Date Posted: 03 October 2009 at 3:07am

Ok as I understand it;

The X1 design is for an 18" speaker, if you have made one, but with a 15" rather than a 18"driver, the way the cabinet sounds and behaves will be very different from how it would be with an 18" driver (and not better).

The X12 as described on the plans section does not include a passive crossover (which would split the audio frequencies between the high and low frequency drivers) so is designed for use with an active crossover (which splits the audio signal into high and low frequencies before the amp) So the X12 would be driven by two separate amps, usually one amp would drive the two 12" drivers together (which, if they were two 8 ohm drivers wired in parallel would present a 4 ohm load to the amp) and a second amp would drive the single high frequency driver (these are usually rated 8-16ohm)

you should be aware that some combinations of box / drivers will work much better than others, obviously if you are on a very tight budget you may have to compromise to begin with, If this is a school project I'd recommend you look at a modelling program such as WINSID or bassbox pro, this helps you predict how a combination of speaker drivers/box size will respond/sound (you could input the theile small data {provided by the manufacturer) of different drivers and choose the best one for your chosen application. people on here will be able to offer good advice once you've got started.

good luck.