Pro Audio

Tour Grade

Cab Design Spec Sheet


21-inch Tour Grade - American Muscle Arguably the best 21-inch subwoofer on the market. Advanced measurement systems and FEA optimization tools were implemented on this next generation of tour grade worthy subwoofers by Eminence. The result is absurd, unrivaled displacement and exceptionally high power handling with top of the line performance in small to large vented enclosures.

Suggested Retail  $939.99
Your Price  $879.99

For contiguous USA shipments only.

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  • 7-Year Warranty*
*Warranty policy may vary outside the USA.
This table charts the specifications for the NSW6021-6 speaker
Speaker Detail
Nominal Basket Diameter21", 533 mm
Nominal Impedance*6 Ω
Power Rating*
Program Power5000 W
Watts2500 W
Resonance29 Hz
Usable Frequency Range25 Hz - 0.6 kHz
Sensitivity*97.0 dB
Magnet Weight45 oz.
Gap Height0.75", 19 mm
Voice Coil Diameter6", 152 mm
Thiele & Small Parameters
Resonant Frequency (fs)29 Hz
DC Resistance (Re)3.8 Ω
Coil Inductance (Le)1.38m H
Mechanical Q (Qms)15.35
Electromagnetic Q (Qes)0.31
Total Q (Qts)0.31
Compliance Equivalent Volume (Vas)224.58 liters / 7.93 cu.ft.
Peak Diaphragm Displacement Volume (Vd)3448.2 cc
Mechanical Compliance of Suspension (Cms)0.06 mm/N
BL Product (BL)33.79 T-M
Diaphragm Mass Inc. Airload (MMs)508 grams
Efficiency Bandwidth Product (EBP)94
Maximum Linear Excursion (Xmax)21 mm
Surface Area of Cone (Sd)1642 cm2
Maximum Mechanical Limit (Xlim)40.4 mm
Mounting Information
Recommended Enclosure Volume
Sealed N/a
Vented 155.74-481.39 liters / 5.50-17.00 cu.ft.
Driver Volume Displaced0.379 cu.ft. / 10.72 liters
Overall Diameter21.65", 549.9 mm
Baffle Hole Diameter19.83", 503.7 mm
Front Sealing GasketYES
Rear Sealing Gasket
Mounting Holes Diameter0.34", 8.6mm
Mounting Holes B.C.D.20.67", 525mm
Depth10.39", 263.9 mm
Net Weight48.1 lbs, 21.82 kg
Shipping Weight51.6 lbs, 23.41 kgs
Materials of Construction
Coil ConstructionI/O Copper voice coil
Coil FormerFiberglass former
Magnet CompositionNeodymium magnet
Core DetailsVented motor
Basket MaterialsDie-cast aluminum basket
Cone CompositionWet pressed, X5 cone pulp
Cone Edge CompositionAdvanced Polycotton surround
Dust Cap CompositionWet pressed, X5 dust cap pulp

Multiple units exceed published ratings evaluated under EIA 426A specification while tested in a free-air, non-temperature-controlled environment. Multiple compression drivers exceeded published ratings evaluated under EIA-426A or AES specification while mounted on Eminence’s H290, H290S, or H2EA horn in a non-temperature-controlled environment.

The average output across the usable frequency range when applying 1W/1m into the nominal impedance. i.e: 2.83V/8Ω, 4V/16Ω. Eminence response curves are measured under the following conditions: All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance | LMS using 0.25" supplied microphone (software calibrated) mounted 1m from wall/baffle | 2 ft. x 2 ft. baffle is built into the wall with the speaker mounted flush against a steel ring for minimum diffraction | Yamaha P3500S amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges). Compression drivers were tested using a 2ft x 2ft baffle built into the wall with horn front mounted.

BETA 8CX, 10CX and 12CX are coaxial speakers with tweeter sold separately. The data for these coaxial woofers was calculated with the ASD:1001 driver screwed into the woofer, but not active.

Prices, specifications and product cosmetics are subject to change without notice.