Anand's Speakers '10: May 2010

Foam Stapled onto Wooden Template (#1)

SolidWorks Engineering Drawing

Tool List

I used the solder to tin the ends of the wires. I also used it to solder on the components.

I used the soldering iron to tin the ends of the wires. I also used it to solder on the components.

I used the wire cutters to cut the wires to length and also to strip the ends of the wires.

I used the Roland CX300 to cut out the circuit on my PCB Board.

These screws were used for screwing in the ports.

Masking tape was used to tape up the cabinets for spraying.

The spray-gun was used to spray the lacquer onto the front templates.

I used the rivet gun to stick rivets into the inside of the ports.

I used the belt-sander to sand down the edges of my template.

I used the glue to glue on the foam cutouts and the dial to the microwave.

I used the scroll saw to cut out the front templates for my microwaves.

I used the band saw to cut the ports to shape.

I used the drill press to cut out the port, tweeter and woofer holes on both templates.

I will use the drill to drill holes around the template, and then to screw in the screws. I will also use it to drill in the speaker terminals.

I used the 2.5mm drill bit to drill both the holes in the microwaves and templates.

I used the ruler to measure all the dimensions.

I used the set-square to make sure my edges were straight and the corners at right-angles.

I used the screwdriver to unscrew all the screws when taking the
microwaves apart.

I used the counter-sunc drill piece to counter-sync the template holes.

I used the craft knife and scissors to cut out my foam pieces. I also used the scissors to make the crosses on the three holes.

I used the staple-gun to staple the foam cutouts to the template.

I used the clamps to clamp the templates to the drill press before drilling the holes and to hold the foam in place.

I got terry to use the table saw to cut out the original template sheet and a port.

Bracing is an acoustic treatment of the box. It allows the box to stop the flexing waves forms that are reproduced inside it. The port is the 'interface' between the box and the outside. It counterbalances the moving of the voice coil by pushing out when the coil is moving in (through magnetism) and vice versa.

Carpet Underlay Notes

Carpet underlay is an absorber of unwanted frequencies inside the box. Low frequencies inside the box bounce of the wall of the box, hitting other frequencies that need to be reproduced, cancelling out the bass. The speakers sound tinny. The carpet underlay absorbs any unwanted frequencies.

Standing Wave/Phase Cancellation Notes

Standing waves are wave forms that 'stand' on the edge of the front plate, lingering around not dispersing properly. As they linger they interfere with other waveforms coming through, cancelling out waves that you want to reproduce. It produces a baseless speaker response.This is easily fixed by rounding the edges of the front plate. The standing waves will disperse outwards as they hit the edge, stopping any wave cancellation.