Versatile Load

REDCATT 155FIND

Best box: 133.2 L bass reflex tuned to 34.0 Hz · F3 47.7 Hz

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Comparable 15.0" Drivers

Drivers with similar piston area, resonance and Qts — useful alternatives when the REDCATT 155FIND does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.

REDCATT

DR-15-013-8R-B2-C0001

15.0" · Fs 40.0 Hz · Qts 0.73 · Vas 166.5 L

REDCATT

154FIND

15.0" · Fs 38.0 Hz · Qts 0.4 · Vas 187.2 L

REDCATT

DR-15-012-8R-B2-C0001

15.0" · Fs 38.0 Hz · Qts 0.4 · Vas 187.2 L

Celestion

PULSE XL 15.25 15" 700 Watt Professional Woofer 8 Ohm

15.0" · Fs 39.9 Hz · Qts 0.68 · Vas 193.1 L

P.Audio

IMF HP15W V3

15.0" · Fs 41.0 Hz · Qts 0.7 · Vas 135.9 L

PRV Audio

15W1000v2 15" Professional Woofer 8 Ohm

15.0" · Fs 39.6 Hz · Qts 0.68 · Vas 206.4 L

Compare them in the same box → Browse all 15.0" drivers → All REDCATT drivers →

⚠️ Engineering Notice for Builders

Large enclosure volume (133.2 L) requires extensive internal matrix bracing to prevent panel resonance.

Recommended Bass Reflex (Vented)

PORT BUILDABLE

Net Box Volume (Vb)	133.2 Liters
Tuning Frequency (Fb)	34.0 Hz
F3 (-3 dB Cutoff)	47.7 Hz
F6 / F10 Extension	39.6 Hz / 30.5 Hz
Port Inner Diameter	Ø 10.0 cm
Port Physical Length	8.1 cm
First Pipe Resonance	2113.0 Hz
Estimated MOL @ F3	117.0 dB SPL

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Sealed (Acoustic Suspension) — compromise

SUITS INFINITE / OPEN BAFFLE

With Qts 0.73 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.032; for a flat response this driver is better used on an infinite (IB) or open baffle.

Net Box Volume (Vb)	166.5 Liters
System Q (Qtc)	1.032 (above Butterworth: Qtc cannot fall below Qts (0.73))
System Resonance (Fc)	56.6 Hz
F3 (-3 dB Cutoff)	46.0 Hz
F6 / F10 Extension	38.0 Hz / 30.5 Hz
Air Spring Linearity	High (Zero port compression)

Simulate This Sealed Box in App →

Thiele/Small Parameters

Resonance (Fs)	40.0 Hz
Total Q (Qts)	0.73
Electrical Q (Qes)	0.781
Mechanical Q (Qms)	11.1

Equivalent Volume (Vas)	166.5 Liters
Diaphragm Area (Sd)	881.0 cm²
DC Resistance (Re)	6.2 Ω
Efficiency Bandwidth Product (EBP)	51.2

Linear Excursion (Xmax)	4.8 mm
Thermal Power (Pe)	800.0 W
Nominal Diameter	15.0"
Catalog Source	Load Forge catalog (manufacturer datasheets and retailer listings)

Frequently Asked Questions

What is the recommended ported (bass reflex) box volume for REDCATT 155FIND?

Load Forge's calculated alignment puts REDCATT 155FIND in a 133.2 liter vented enclosure tuned to 34.0 Hz, reaching an F3 cutoff of approximately 47.7 Hz.

Can REDCATT 155FIND be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 166.5 liters with a Qtc of 1.032 (above Butterworth: Qtc cannot fall below Qts (0.73)), the system exhibits an F3 of 46.0 Hz.

What port dimensions should be used for REDCATT 155FIND to avoid port chuffing?

Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 8.1 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.

Shareable Acoustic Card for Forums & Social Media

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