RS 40-1354
Specs of RS 40-1354A
Radio Shack SPECIFICATIONS for 5-1/4” HiFi Auto Speaker Cat. No. 40-1354A
Impedance 8 Ohms
Frequency response 50 - 14,000 Hz
Free air resonance 50 Hz
Efficiency (SPL at 1 Watt, 1 Meter) 90 dB
Nominal power 20 Watt
Maximum power 40 Watt
Magnet weight 10 oz
Speaker weight 30.6 oz
SPECIFICATIONS posted on Bottlehead Forum by Greg on 1.20.2000
Fs = 71.5
Vas = 7.3 liters
Qts = .49
Qms = 3.85 and he notes:
These should be enough to get you started. They seem to indicate a 14
liter ( .5 cu ft) box tuned to about 58 Hz.
Ported Box Calc
Golden ratio is 1.62
Box volume = 0.5 cubic ft * (1728 cubic inches / 1 cubic ft) = 864 cubic inches
9.0 * 14.5 * 6.5 = 848.25 - inside
10 * 15.5 * 7.5 - outside
baffle cutout
diameter 4.875 inch (4 7/8) - radius 2.4375 inch (2 7/16)
onlineconversion.com/circlesolve
Port calculation
1 inch diameter - 1 port - 0.5 cubic ft. - 58 Hz - 1.5 inch port length
1.37 inch diameter - 1 port - 0.5 cubic ft. - 58 Hz - 2.36 inch port length
Terminal Cup
$1.25 at Parts Express Parts Express Square Speaker Wire Spring Terminal Cup Part # 260-297
port tube
$2.57 at parts express Parts Express Speaker Cabinet Port Tube 1-3/8” ID Adjustable
grill foam
$10 at parts express Parts Express Speaker Cabinet Grill Foam 19” Wide x 31” Long x 3/8” Thick Black
mounting screws
$2.61/100 at parts express Parts Express #8 x 1/2” Deep Thread Pan Head Screws Black 100 Pcs.