Name: XMAXXX Monster 18″ Car Subwoofer | 4000 Watts RMS | Dual Voice Coil 1 Ohm or 2 Ohm
Brand: American Bass
SKU: XMAXXX-1811-A
Price: 1729.75 USD
Rating: 4.0 (2 reviews)

Product info
MPN	XMAXXX-1811
UPC	860013728304
Brand	American Bass
Option	1 Ohm / Grade A – Factory Sealed

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1811

The American Bass XMAXXX Monster has arrived, and it is ready to dominate any car audio system. With an iconic look and a serious build usually reserved for the pros, this subwoofer won't disappoint. The perfect balance of fit, finish, and functionality of the XMAXXX will guarantee that your audio system will benefit from the added performance of the true power this sub provides.

The blue powder-coated basket and matching surround with blue stitching give this subwoofer a classic look and will draw attention from anyone who passes by your ride. But looks aren't everything, and that's why the powerful voice coil on these subs is sure to turn up your sound output.

So if you're looking to add some serious high-powered bass to your vehicle, then grab an American Bass XMAXXX Monster today! It's sure to give you superior performance, no matter what kind of music you play or what kind of environment you find your car audio system in. Your neighbors won't be happy, but that's alright - with the Monster installed, you’ll have the meanest car audio system on the block.

Product info
MPN	XMAXXX-1822
UPC	860013728311
Brand	American Bass
Option	2 Ohm / Grade A – Factory Sealed

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1822

Product info
MPN	XMAXXX-1811
Brand	American Bass
Option	1 Ohm / Grade B – Open Box

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1811

Product info
MPN	XMAXXX-1811
Brand	American Bass
Option	1 Ohm / Grade C – Open Box + Minor Damage

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1811

Product info
MPN	XMAXXX-1822
Brand	American Bass
Option	2 Ohm / Grade B – Open Box

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1822

Product info
MPN	XMAXXX-1822
Brand	American Bass
Option	2 Ohm / Grade C – Open Box + Minor Damage

XMAXXX Monster 18″ Subwoofer

SKU: XMAXXX-1822

Condition
Vault SKU	XMAXXX-1811-A

Disclaimer: Vault products may differ from current retail versions in power ratings, specifications, or model revisions. As these items may be older versions or returned products, please review the product details and condition notes carefully before purchasing. Product images may not exactly reflect the item you receive.

Power & performance
Size (in)	18
Impedance (Ω)	1+1
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	86.5
SPL (dB)	86.5
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	31.76
Qes	0.59
Qms	5.55
Qts	0.53
BL (T·m)	23.95
Mms (g)	855
Vas (L)	53.57
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Power & performance
Size (in)	18
Impedance (Ω)	2+2
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	87.2
SPL (dB)	87.2
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	32.5
Qes	0.47
Qms	6.17
Qts	0.43
BL (T·m)	38.12
Mms (g)	929
Vas (L)	46.98
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Power & performance
Size (in)	18
Impedance (Ω)	1+1
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	86.5
SPL (dB)	86.5
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	31.76
Qes	0.59
Qms	5.55
Qts	0.53
BL (T·m)	23.95
Mms (g)	855
Vas (L)	53.57
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Power & performance
Size (in)	18
Impedance (Ω)	1+1
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	86.5
SPL (dB)	86.5
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	31.76
Qes	0.59
Qms	5.55
Qts	0.53
BL (T·m)	23.95
Mms (g)	855
Vas (L)	53.57
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Power & performance
Size (in)	18
Impedance (Ω)	2+2
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	87.2
SPL (dB)	87.2
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	32.5
Qes	0.47
Qms	6.17
Qts	0.43
BL (T·m)	38.12
Mms (g)	929
Vas (L)	46.98
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Power & performance
Size (in)	18
Impedance (Ω)	2+2
RMS power (W)	4,000
Peak power (W)	8,000
Sensitivity (dB)	87.2
SPL (dB)	87.2
Xmax (mm)	22.5
T/S parameters
Fs (Hz)	32.5
Qes	0.47
Qms	6.17
Qts	0.43
BL (T·m)	38.12
Mms (g)	929
Vas (L)	46.98
Construction
Voice coil (in)	4
Voice coil wire	Hi-temp 4-layer voice coil wire
Cone	Carbon fiber enforced non-pressed paper cone
Cone material	Carbon-fiber reinforced non-pressed paper
Surround	Over-sized fat foam surround
Basket	Blue powder-coated heavy-duty basket (metal frame)
Magnet	Triple-stacked high-energy magnets
Install
Mounting depth (in)	11.5
Cutout diameter (in)	16.8

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

Support
Spec sheet	Download PDF
Email	hello@americanbassusa.com
Phone	440-409-7932
Fit questions	Ask before you buy. All sales are final.
Arrived damaged?	Report within 7 days

Before You Buy FAQ

HOW THE VAULT WORKS

From returned gear to tested equipment at a lower price.

Gear comes back

Open-box and returned products arrive at our Ohio warehouse.

We test and grade it

Every unit is inspected, function-tested, and graded by condition. Items that don't meet our standards aren't sold.

You save

Each item is priced according to its condition, below regular retail pricing.

Ships in 3–4 business days.