Guitar / Bass
Patriot Series
820H
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.
| Specification | |
| Nominal Basket Diameter | 8", 203.2mm |
| Nominal Impedance* | 4 ohms |
| Power Rating** | |
| Watts | 20W |
| Music Program | N/A |
| Resonance | 143.55Hz |
| Usable Frequency Range | 80Hz - 4.6kHz |
| Sensitivity*** | 96.1dB |
| Magnet Weight | 15 oz. |
| Gap Height | 0.25", 6.35mm |
| Voice Coil Diameter | 1", 25.4mm |
| Thiele & Small Parameters | |
| Resonant Frequency (fs) | 143.55Hz |
| DC Resistance (Re) | 3.64 |
| Coil Inductance (Le) | 0.33mH |
| 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) | 36.7cc |
| Mechanical Compliance of Suspension (Cms) | 0.13mm/N |
| BL Product (BL) | 5.74 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 9.25 grams |
| Efficiency Bandwidth Product (EBP) | 155.7 |
| Maximum Linear Excursion (Xmax) | 1.59mm |
| Surface Area of Cone (Sd) | 230.9 cm2 |
| Maximum Mechanical Limit (Xlim) | 0mm |
| Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | N/a |
| Vented | N/a |
| Driver Volume Displaced | 31.12 cu.in. / 0.51 liters |
| Overall Diameter | 8.24", 209.3mm |
| Baffle Hole Diameter | 7.13", 181.1mm |
| Front Sealing Gasket | Fitted as standard |
| Rear Sealing Gasket | N/A |
| Mounting Holes Diameter | 0.22", 5.58mm |
| Mounting Holes B.C.D. | 7.75", 193.85mm |
| Depth | 3.06", 77.72mm |
| Net Weight | 3.1 lbs, 1.41 kg |
| Shipping Weight | 3.9 lbs, 1.77 kgs |
| Materials of Construction | |
| Coil Construction | Copper voice coil |
| Coil Former | Polyimide former |
| Magnet Composition | Ferrite magnet |
| Core Details | None-vented core |
| Basket Materials | Pressed steel basket |
| Cone Composition | Paper cone |
| Cone Edge Composition | Full paper cone |
| Dust Cap Composition | Zurette dust cap |
Footnotes
* Please consult www.eminence.com for specifications of models with alternative impedances.
** Multiple units exceed published rating evaluated under EIA 426A noise source and test standard while in a free-air, nontemperature-controlled environment.
*** The average output across the usable frequency range when applying 1W/1m into the nominal impedance. ie: 2.83 V /8 ohms, 4 V /16 ohms. 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 | Hafler P1500 Trans-Nova amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges).
**** BETA 8CX, 10CX, 12CX and ACOUSTINATOR™ CX 2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.
***** Multiple units exceeded published rating evaluated under AES 500 and AES 800 noise sources and test standards while mounted on Eminence's TI-2000 horn in a nontemperature-controlled environment.
****** The average on axis output across the entire usable frequency range when applying 1W/1m into the nominal impedance while mounted on a Community SH 494 horn measured with: LMS (software calibrated) using a 0.25" [6.4mm] supplied microphone mounted 1m from horn mouth, Hafler P1500 Trans-Nova amplifier, 2700 cu.ft. chamber w/fiberglass on all six surfaces (three with custom made wedges). Plane-wave tube response and impedance curves measured with LMS on a 0.75" [19.1mm] diameter tube with adapter to allow for smooth transition to throat diameter and 1W/1m into nominal impedance. Prices and Specifications Subject to Change Without Notice.
