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HiVi SP10 DIY Subwoofer Project

Adam McCall   USA Flag     To email Adam, type out the email address.

HiVi SP10 DIY Subwoofer Project

This subwoofer was created to match and aid the 1.618 Hi-Vi 3-way tower loudspeakers. The main focus of the HiVi SP10 subwoofer was to reproduce ultra low frequencies that the 1.618 could not reproduce and aid in overall low end musical reproduction. Low, flat and not "boomy" was priority one. This DIY subwoofer project uses the HiVi SP10 10-inch subwoofer driver which can deliver plenty of bottom end.

General Info:

  • 10" HiVi SP10 4 ohm subwoofer
  • O-Audio 500 Watt plate amplifier
  • Freq Response: 25Hz up to chosen x-over point.
  • Overall Dimension: 21"x 12.75"x 20"

The enclosure design and model frequency response are shown below.

HiVi SP10 DIY Subwoofer Enclosure Drawing

Figure 1: HiVi SP10 DIY Subwoofer Enclosure Drawing

HiVi SP10 Subwoofer Model Response

Figure 2: Modelled Response HiVi SP10 Subwoofer Enclosure

DIY Subwoofer Enclosure Construction

The subwoofer enclosure construction is shown in the photographs below. I cannot begin to express how important it is to stuff the enclosure to the HILT with poly fill.

Subwoofer Box Assembly

Photograph 1: Subwoofer Box Assembly

MDF Subwoofer Box ready for Painting

Photograph 2: MDF Subwoofer Box ready for Painting

The finished subwoofer cabinet is then primed and painted using several coats of an oil based epoxy paint.

Primer and Epoxy Painting Subwoofer Cabinet

Photograph 3: Primer and Epoxy Painting Subwoofer Cabinet

The remainder of the subwoofer cabinet is finished with red oak trim.

DIY HiVi SP10 Subwoofer

Photograph 4: Finished DIY HiVi SP10 Subwoofer

O-Audio Subwoofer Plate Amplifier

Photograph 5: Rear View - HiVi SP10 Subwoofer with O-Audio Plate Amp

Measurements and Listening Notes - HiVi SP10 DIY Subwoofer

The measured in-room response of the HiVi SP10 DIY Subwoofer is shown in the plot below.

HiVi SP10 Subwoofer Measured In Room Response

HiVi SP10 DIY SubwooferFigure 3: HiVi SP10 Subwoofer Measured Room Response

INSANITY! This is a VERY powerful sub, and being involved for years with car audio, I mean that. The gain is about 1/4 of the way and I love it! Smooth, tight, accurate and excellent at reproducing lows. I only wish I didn't live in an apartment I could unleash this thing! It tries to move across my floor when turned up half way, and it has spikes on the base. Once I got it tuned they way I like it, it definitely adds to the 1.618 HiVi 3-way tower loudspeakers well.

Parts List and Costs - HiVi SP10 DIY Subwoofer

A list of the parts used for this project and corresponding cost is provided in the table below. With the excpetion of the O-Audio plate amplifier, All of the speaker parts for this project are available from Parts Express (USA). All prices are in US dollars and were last updated in Spetember 2011.

 Parts Express #  Description  Qty   Price (each)  Cost
Acousta-Stuff Polyfill 1lb
1/2" Super Toe Spike Set
Dayton 3" Outside Flare
 Dayton 3" x 15.75" Port Tube 
16awg Black Wire 100ft
16awg Red Primary Wire 100ft
HiVi SP10" Subwoofer
#8x 1" Screws - 100pc
O-Audio 500W Plate Amp

Speaker Parts Total: $569.92
Cabinets Materials (MDF, Red Oak, Screws, Caulking, Glue, Lexan, Screws, Stain, Paint, Wood filler): ~$100US
Total Project Cost: ~$670US

Note that the cost estimate is a little on the high side as some of the material (ie - 100 feet of wire, screws, glue, paint ...) was previously left over from the HiVi Tower build.

DIY HiVi Home Theatre Speakers

Photograph 6: DIY HiVi Home Theatre Speakers

The above photo shows the HiVi SP10 Subwoofer with the 1.618 HiVi 3-way Tower Loudspeakers and the 1.618 HiVi Center Channel Speaker.