Vented Specialist

Atohm LD180CR04

Best box: 13.9 L bass reflex tuned to 53.9 Hz · F3 54.8 Hz

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Comparable 7.5" Drivers

Drivers with similar piston area, resonance and Qts — useful alternatives when the Atohm LD180CR04 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.

SB Acoustics

7½″ SATORI MT19CP-8 / paper

7.5" · Fs 43.0 Hz · Qts 0.31 · Vas 37.1 L

Lowther

PM7A

7.5" · Fs 45.0 Hz · Qts 0.28 · Vas 45.0 L

JBL

LE8T

7.5" · Fs 45.0 Hz · Qts 0.49 · Vas 34.0 L

JBL Professional

LE8T

7.5" · Fs 45.0 Hz · Qts 0.49 · Vas 34.0 L

Dayton Audio

RS180P-8 7" Reference Paper Woofer 8 Ohm

7.0" · Fs 45.8 Hz · Qts 0.34 · Vas 22.1 L

JBL

112A

7.5" · Fs 40.0 Hz · Qts 0.21 · Vas 34.0 L

Compare them in the same box → Browse all 7.5" drivers → All Atohm drivers →

⚠️ Engineering Notice for Builders

Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.

Recommended Bass Reflex (Vented)

PORT BUILDABLE

Net Box Volume (Vb)	13.9 Liters
Tuning Frequency (Fb)	53.9 Hz
F3 (-3 dB Cutoff)	54.8 Hz
F6 / F10 Extension	48.1 Hz / 41.9 Hz
Port Inner Diameter ESTIMATED	Ø 7.5 cm
Port Physical Length	27.4 cm
First Pipe Resonance	627.0 Hz

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	6.3 Liters
System Q (Qtc)	0.707 (Butterworth)
System Resonance (Fc)	98.9 Hz
F3 (-3 dB Cutoff)	95.5 Hz
F6 / F10 Extension	73.1 Hz / 55.5 Hz
Air Spring Linearity	High (Zero port compression)

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Thiele/Small Parameters

Resonance (Fs)	46.0 Hz
Total Q (Qts)	0.32
Electrical Q (Qes)	0.348
Mechanical Q (Qms)	3.94

Equivalent Volume (Vas)	24.3 Liters
Diaphragm Area (Sd)	160.0 cm²
DC Resistance (Re)	3.6 Ω
Efficiency Bandwidth Product (EBP)	132.1

Linear Excursion (Xmax)	N/A mm
Thermal Power (Pe)	N/A W
Nominal Diameter	7.5"
Catalog Source	Load Forge catalog (manufacturer datasheets and retailer listings)

Frequently Asked Questions

What is the recommended ported (bass reflex) box volume for Atohm LD180CR04?

Load Forge's calculated alignment puts Atohm LD180CR04 in a 13.9 liter vented enclosure tuned to 53.9 Hz, reaching an F3 cutoff of approximately 54.8 Hz.

Can Atohm LD180CR04 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 6.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 95.5 Hz.

What port dimensions should be used for Atohm LD180CR04 to avoid port chuffing?

Xmax is not published for Atohm LD180CR04, so the port is an empirical estimate: a 7.5 cm diameter with a length of 27.4 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.

Shareable Acoustic Card for Forums & Social Media

Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.

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