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Date: November 24, 2014 at 08:27:07
From: WaltO, []
Subject: Newbie needs help

I am not an audiophile and know next to nothing
about speaker design and building, but I'm OK with
wood working. I just want better sound on my TV. I
have a ZVOX 555 soundbase that improved my TV sound,
but I wanted more bass. I bought a Polk PSW-10
subwoofer from Amazon and sent it back because it
sounded terrible.

I would like to build a powered sealed-box
downfiring subwoofer using one 8" Peerless 830667
subwoofer as the driver. I calculated the %sag
using the Parts Express formula and it was 1.7%
which would work for a downfiring design. I want
downfiring because I think I can make it look less
like a subwoofer, maybe more like a plant stand?

Here is my question. Can I simply build a box using
the optimum cabinet size as provided by Parts
Express? I'm assuming I have to account for the
displacement of the speaker and amplifier
components. Please let me know if you think this is
a bad idea and maybe provide some insight or
guidance if you'd like.

Thank you,


Here are speaker specs from Parts Express:
Nominal Diameter 8"
Power Handling (RMS)110 Watts
Power Handling (max)220 Watts
Impedance8 ohms
Frequency Response 36.5 to 2,000 Hz
Sensitivity 87.2 dB 2.83V/1m
Voice Coil Diameter 1.5"

Resonant Frequency (Fs)42 Hz
DC Resistance (Re)5.5 ohms
Voice Coil Inductance (Le)0.78 mH
Mechanical Q (Qms)5.7
Electromagnetic Q (Qes)0.75
Total Q (Qts)0.66
Compliance Equivalent Volume (Vas)0.93 ft.³
Mechanical Compliance of Suspension (Cms)0.41 mm/N
BL Product (BL)8.26 Tm
Diaphragm Mass Inc. Airload (Mms)34.78g
Maximum Linear Excursion (Xmax)8.41 mm
Surface Area of Cone (Sd)213.8 cm²

Sealed Volume 0.72 ft.³
Sealed F358 Hz
Vented Volume2.09 ft.³
Vented F328 Hz
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