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Product Details

Description

The 820H 8" Lead / Rhythm Guitar Speaker - Hemp is an Eminence guitar speaker for musicians, builders, and repair technicians seeking a purposeful replacement or new-cabinet driver. 4 ohm hemp cone speaker with rich, warm, full bodied tone with fat, punchy lows, smooth, but defined highs, and a nice break up. Prominent mids, but with a warm, smooth texture. Key specifications include 20 W power handling, 4 Ω nominal impedance, 80 Hz - 4.6 kHz usable frequency range, 96.1 dB sensitivity.

Its construction features a ferrite magnet, a hemp paper cone, a 1", 25 mm voice coil, supporting reliable performance in compatible cabinets and amplifiers. Use it for amplifier upgrades, custom cabinet projects, tonal experimentation, or restoring a working rig with a speaker selected for its musical response. Before installation, confirm the amplifier's impedance requirement, available mounting depth, cabinet cutout, and power compatibility. For best results, choose an enclosure and amplifier pairing appropriate for the published specifications and the desired playing style.

Characteristics

Filter series

Patriot

Model

820H

Characteristics application

8" Open or Closed Back

Configuration

1, 2, or 4 x 8"

Low end response

Aggressive

High end response

Moderate

Overall coloration

A rich, warm, full bodied tone that emulates a larger cone, with fat, punchy lows, smooth, but defined highs, and a nice break up. The mids are prominent, but with a warm, smooth texture.

Break up modes

Balanced

Characteristics power range

20

Instrument

Lead/Rhythm Guitar
Harmonica

Characteristics genre

Blues
Country
Jazz
Rock

Specifications

Nominal basket diameter

8", 203mm

Nominal impedance

4 Ω

Power rating program power

40 W

Power rating watts

20 W

Resonance

144 Hz

Usable frequency range

80 Hz - 4.6 kHz

Sensitivity

96.1 dB

Gap height

0.25", 6.4 mm

Voice coil diameter

1", 25 mm
Thiele & Small Parameters

Resonant frequency fs

144 Hz

Dc resistance re

3.64

Coil inductance le

0.33

Mechanical q qms

18.78

Electromagnetic q qes

0.92

Total q qts

0.88

Compliance equivalent volume vas

9.62 liters, 0.34 cu.ft.

Peak diaphragm displacement volume vd

36.7 cc

Mechanical compliance of suspension cms

0.13 mm/N

Bl product bl

5.74

Diaphragm mass inc airload mms

9

Efficiency bandwidth product ebp

156

Maximum linear excursion xmax

1.59 mm

Surface area of cone sd

230.9 cm²
Mounting Information

Recommended enclosure volume sealed

Acceptable

Recommended enclosure volume vented

Acceptable

Driver volume displaced

0.018 cu.ft. / 0.51 liters

Overall diameter

8.24", 209.3 mm

Baffle hole diameter

7.13", 181.1 mm

Front sealing gasket

Yes

Mounting holes diameter

0.22", 5.6mm

Mounting holes b c d

7.75", 196.9mm

Depth

3.06", 77.7 mm

Net weight

3.1 lbs, 1.41 kg

Shipping weight

3.9 lbs, 1.77 kgs
Materials of Construction

Coil construction

Edgewound copper

Voice coil former

Polyimide

Magnet material

Ferrite

Basket material

Pressed steel

Cone composition

Hemp paper

Surround

Paper

Dust cap composition

Zurette
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