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