Wednesday, April 29, 2015

Two Bass Channels For STEREO

Today, I finished up the first two lengths of the second bass horn and installed an eight inch bass driver.  Here are some photos of the work progress so far.

Four ribs are fastened to the larger flange.

Sound Transformer Second Bass Horn - Four Ribs Attached
Sound Transformer Second Bass Horn - Four Ribs Attached
 Then, the smaller flange is attached to the rib ends.


Sound Transformer Second Bass Horn - Smaller Flange Attached
Sound Transformer Second Bass Horn - Smaller Flange Attached
The other four ribs are fastened in.


Sound Transformer Second Bass Horn - Other Four Ribs Attached
Sound Transformer Second Bass Horn - Other Four Ribs Attached
After fastening two opposing trapezoids, a piece of corrugated cardboard is used to make a pattern for the curved sides.

Sound Transformer Second Bass Horn - Fitting The Cardboard Pattern
Sound Transformer Second Bass Horn - Fitting The Cardboard Pattern

The only tools required to fit the pattern edges to the curved trapezoids are a utility knife and a length of 50 grit sandpaper cut from a sander roll.


Sound Transformer Second Bass Horn - Tools For The Cardboard Pattern
Sound Transformer Second Bass Horn - Tools For The Cardboard Pattern
 For the first part of the second bass horn already completed, I used a scroll saw to cut out the sides.  This time, for the second part of the horn, I used a fine-toothed handsaw and it worked pretty well.


Sound Transformer Second Bass Horn - Handsaw For Cutting Panel
Sound Transformer Second Bass Horn - Handsaw For Cutting Panel
 Here is the mid section part of the second bass horn with three sides attached and the fourth one being fitted.  I cut them a little larger than the cardboard pattern.


Sound Transformer Second Bass Horn - Fitting The Fourth Side
Sound Transformer Second Bass Horn - Fitting The Fourth Side
Jumping ahead a little, here are the first two sections bolted together and ready for the eight inch driver installation.

Sound Transformer Second Bass Horn - First Two Sections Bolted Together
Sound Transformer Second Bass Horn - First Two Sections Bolted Together

Here are the two nearly identical stereo pair set up for listening tests.  They will be more identical after I build the third throat section for the second bass horn.  The second bass horn uses different panel stock than the first one.


Sound Transformer STEREO Version Ready For Listening Testing
Sound Transformer STEREO Version Ready For Listening Testing
It is 6:30PM and I don't have a lot of time to try this out right now.  Before closing up shop today, I did manage to listen to a little of Beatles' Yesterday and Today, Dire Straits' Brothers In Arms, and The Notorious Byrd Brothers.  I also listened to a vintage promotional stereo LP of big band music made by University Sound a long time ago.  This is all amazing sounding stuff played through this system.  I plan more testing tomorrow.

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