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Speaker Box Designs

Some of these Bass Guitar Speakers Box Designs below are my own creation.  However, I have utilized the engineering provided by the manufacture for these systems (See BassLightCabinetDesigns.pdf document).  The first system considered here is a 8x10 modular system, which is really four 2x10 cabinet boxes stacked.  This is in part based on emulating the Ampeg 8x10 bass speaker system for the famous SVT bass head.  Some of the original systems had a 32 ohm cabinet, which indicates that the speakers were 4 ohm and likely wired in series.  This of course was designed to match the amplifier's output transformer.  Also, the Ampeg speaker cabinet used Eminence 10 inch woofers, and the cabinet was divided into 4 compartments, with two 10 inch woofers in each section, which would handle 75watts at the full output of the amplifier.  Each 2x10 compartment was an infinite baffle type system (i.e. enclosed box, not ported in any way).   If you have never used one of these systems, you have no idea what a great bass system these are.  They are the Holy Grail for most bass players.  Even a "not so great bass" usually sounds much better on one of these systems.  This is due to two main factors:  1) the all tube amplifier, and 2) the large speaker cone area.  This modular speaker box design of mine gets you half way there!

Below are the designs for some cabinet systems:

   2x10 Eminence Bass Cabinet Infinite Baffle

   4x10 Eminence Bass Cabinet Ported Design

   Folded Corner Horn (Klipsch Design)

The 4x10 Ported design above, is again not my specific design, but is just one possible way to build according to the specifications of the Eminence speaker designer. 

The folded Corner Horn (Klipsch Design) is my favorite.  I have built three sets of these boxes, and they are not for the novice builder.  But they are very rewarding if you know what you are doing.  You can actually use a variety of speaker sizes for drivers in the bass cabinet portion.  As I have experimented with 12, 15, and 18 inch woofers in these cabinets.  The most important factor seams to be making sure that the resonant frequency (Fs) of the woofer is significantly below the lowest frequency of the horn itself (F3), which is 40hz.  By experimentation, I have found that even woofers with Fs of 36Hz, are not low enough for this system.  This is likely due to the physical loading of the woofer cone by the air mass in the horn itself.  Most designers, familiar with these systems, recommend using 4 ohm woofers, because of the air mass loading, which changes the impedance of the speaker to a higher number, approximately 8 ohms.  There are number of interesting facets about these speakers: 1) the are not linear in there reproduction of frequencies, since they have two very notable spikes at 80hz and 300hz, 2) No insulation is needed in the space behind the woofer, since it is so odd shaped, 3) The frequencies developed by the entire system are mechanically delayed and approximate the effect of BBE sonic maximizer, where the highest frequencies are heard first, followed by the mid range, and then then the bass notes.  This delay is in the single digit milli-seconds and is not generally perceived most people. 

Below is the 3/4 inch plywood I used for my 2x10 cabinet project, and some left over 10 inch woofers I had laying around, just to get me motivated for this project.  What a beautiful site!

 

Below, these are Eminence CA2010 in a 4x10 design of mine.  This is a vented cabinet

 

 

More Designs are coming soon!

 

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