EE / Mu 107 Project

Update: As of April 2011, 2 of the 4 subwoofers built through this project have returned home to Ricketts Hovse.

GROUP MEMBERS:

Lu Gan (right)

Christoph Baranec (middle)

Ben Gudlewski (left)

PURPOSE:

We have undertaken this project to design a speaker using an 18 inch driver. It will function as the main bass unit or woofer in a full-range speaker setup. Its main purpose is to reinforce the low frequency sounds that are usually inadequately reproduced by smaller drivers. The background for the speaker design was based on The Loudspeaker Design Cookbook, written by Vance Dickason. To facilitate simulations of frequency response curves, we used the MS Excel spreadsheet and equations written by Brian Steele @ www.diysubwoofers.org (Readme) (XLS).

MATERIALS AND METHODS:

The following materials were used or consumed in construction:

Driver:

18” Dayton Audio Cast Iron Driver, [295-085, PE*, $150].

Panels:

1” MDF², sold in 49” x 97” sheets, 120 Lbs per sheet [CWS, $60/sheet].

Panel Damping Material:

Soundcoat self-adhesive sheets, sold in XX” x YY” sheets. [SC, $XX]

Internal Damping Material:

Dacron Fiberfill, sold in rolls, 5 Lb., [SC, $XX per 10 Lb. Roll].

Handles:

Black steel, recessed bar handles, [SH-3025, SC, $6.60].

Ports:

6” PVC Pipe. Outer diameter: 6 5/8”, Inner Diameter 5 XX”, [OSH, XXX$/foot].

Speaker – Neutrik Cable:

Monster Cable OMC (10 gauge), 3 ft. [GG, $1.30/foot].

Connector:

Neutrik Speakon^Ò 4NFLC female receptacle, round end, [092-054, PE, $5].

Grills:

18” 1.1mm thick square mesh, [260-397, PE, $11].

Corners:

2” Black steel corners, 4 [SC, $2.90].

¼ – 20 Bolts:

Length	Usage	# Needed	Retailer, Price
1.5”	Handles	40	CWS, $0.1 each
2”	Driver	8	CWS, $0.1 each
2.25”	Grill	4	CWS, $0.1 each

T – Nuts:

Length	Usage	# Needed	Retailer, Price
¼”	Driver	8	OSH, $0.35 each
½”	Handles, Grill	44	SC, $0.12 each

Screws:

Type	Usage	# Needed	Retailer, Price
1” self-tap	Neutrik connector	4	CWS, $1.22 / box of 100
½” self-tap	Corners	24 (6 each)	CWS, $1.22 / box of 100
2” dry wall	Panels	Lots