Item #: EMI PJ8 LIST

Eminence Red Coat Private Jack 12 Inch Guitar Speaker 50 Watts

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MSRP: $129.99
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Product Description

The Eminence Private Jack is thick and smooth, with lots of mids and extended highs.
It's a very well balanced speaker with classic British flavor. The Private Jack is great for blues, indie and jazz. This great speaker features a 50 watt music program. Available in 8 or 16 ohms.

The Value of Eminence Eminence wants to make sure their customers know exactly what they are getting when they buy a speaker. Therefore, Eminence provides two different ratings to describe the power handling of all their speakers.

    Watts - the guaranteed long term power rating throughout the useable frequency range of the speaker. Translation: the speaker will operate continuously at any frequency within the speakers’ specified frequency range when driven at this power. The Watts rating is similar to RMS, but is really more indicative of long term thermal capability. Music Program - the speaker will safely and reliably handle the varying frequencies of musical content at this power rating.


    The Music Program rating is more indicative of what you can expect in the real world with the speaker operating within the appropriate enclosure reproducing music or vocal audio program.


Eminence is committed to quality and guarantees all of its speakers for 7 years. They build all of their speakers to greatly exceed customer performance expectations. Dollar for dollar against competitors, an Eminence speaker is well worth the money that you invest!
About Eminence
In 1966, Bob Gault founded what was to become the world's largest loudspeaker manufacturing company after working as an engineer for Magnavox and CTS (Chicago Telephone Supply). Ironically, Gault started Eminence hoping to maintain three 18" speakers per day, based on a commitment from Ampeg's Everett Hull. Under the leadership of Gault and most recently his son, Rob, the company's capacity has grown to over 10,000 speakers per day, employing nearly 200 people. Gault was the president of Eminence from the company's inception until 1992. He officially retired in 1993, but continued to make valuable contributions to the company. Gault passed away on Octoboer 4, 2002. he was a husband, father, and grandfather. Gault was also an avid golfer. He is greatly missed by his family, the music industry, and the Eminence community. Eminence, Kentucky (population 3000) is centrally located in the heart of Kentucky, between Louisville and Lexington, Kentucky and Cincinnati, Ohio. Bob Gault chose this location as it was ideally situated for shipping products all over the USA. The Eminence and Henry County community could also provide the labor needed to manufacture products on a large scale. After forty years, Eminence, Kentucky continues to provide ideal conditions for the manufacturing and distribution of the World's #1 Loudspeakers. The Eminence Factory
The first Eminence facility, located in downtown Eminence, employed around thirty people. The building was less than 6,000 sq. ft. and production was often less in one week than it is in one hour at our present facility. In 1972 Eminence Speaker moved to a new location in Shawnee Industrial Park on Mulberry Pike where we remain today. The facility has seen several additions. The first building in this location was just less than 30,000 sq. ft., but now has grown to include nearly 100,000 sq. ft. all under one roof.
How a Speaker Works
The key working components of a loudspeaker are shown in the diagram below. When an electrical current passes through a wire coil (the voice coil) in a magnetic field, it produces a force which varies with the current applied. The cone, connected to the voice coil, moves in and out, creating waves of high and low air pressure. The coil and magnet assembly are the 'motor structure' of the loudspeaker. The movement is controlled by the loudspeaker's suspension which comprises the cone surround and the 'spider'. The surround and spider allow the coil to move freely along the axis of the magnet's core (or 'pole') without touching the sides of the magnetic gap. Eminence technology and proprietary materials mean that age-old 'compromises' of durability against sensitivity, or power handling against precision of response, are more easily solved than you might imagine. Eminence


Heatsinks: In the quest for higher power density (more power and hence more sound from less space), Eminence has progressively introduced heatsink components to selected transducers e.g. cast frame neodymium products and Kilomax. The heatsinks pass through the pole of the transducer or are incorporated into the chassis of the loudspeaker to transfer heat away from the coil. The air currents caused by the cone movement cool the heatsink.

See all items from Eminence
Helpful Info about the Manufacturer
Phone:  502-845-5622 Warranty:  Warranty: 7 years

Product Specifications

Product Specifications

Eminence Private Jack 8 Specifications

  • Nominal Basket Diameter: 12 inches, 304.8mm
  • Nominal Impedance*: 8 ohms
  • Power Rating Watts: 50W Music Program
  • Resonance: 96Hz
  • Usable Frequency Range: 70Hz-5kHz
  • Sensitivity***: 101
  • Magnet Weight: 38 oz.
  • Gap Height: 0.312 inches, 7.92mm
  • Voice Coil Diameter: 1.75 inches, 44.5mm


  • Resonant Frequency (fs): 96Hz
  • DC Resistance (Re): 7.01
  • Coil Inductance (Le): 0.49mH
  • Mechanical Q (Qms): 18.19
  • Electromagnetic Q (Qes): 0.72
  • Total Q (Qts): 0.69
  • Compliance Equivalent Volume (Vas): 33.7 liters / 1.2 cu. ft.
  • Peak Diaphragm Displacement Volume (Vd): 64cc
  • Mechanical Compliance of Suspension (Cms): 0.09mm/N
  • BL Product (BL): 13.5 T-M
  • Diaphram Mass inc. Airload (Mms): 31 grams
  • Efficiency Bandwidth Product (EBP): 134
  • Maximum Linear Excursion (Xmax): 1.2mm
  • Surface Area of Cone (Sd): 519.5 cm2


Recommended Enclosure

  • Sealed: Acceptable
  • Vented: Acceptable
  • Overall Diameter: 12.02 inches, 305.3mm
  • Baffle Hole Diameter: 10.97 inches, 278.6mm
  • Front Sealing Gasket: fitted as standard
  • Rear Sealing Gasket: fitted as standard
  • Mounting Holes Diameter: 0.25 inches, 6.4mm
  • Mounting Holes B.C. D.: 11.63 inches, 295.4mm
  • Depth: 5.1 inches, 130mm
  • Net Weight: 8 lbs., 3.6 kg
  • Shipping Weight: 9.8 lbs., 4.5 kg


  • Coil Construction: Copper voice coil
  • Coil Former: Paper former
  • Magnet Composition: Ferrite magnet
  • Core Details: Non-vented core
  • Basket Materials: Pressed steel basket
  • Cone Composition: Paper Cone
  • Cone Edge Composition: Paper cone edge
  • Dustcap Composition: Zurette dust cap

* Please consult 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, non-temperature controlled environment.
*** The average output across the usable frequency range when applying 1W/1M into the nominal impedance. Ie: 2.83V/8ohms, 4V/16ohms. 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 | 2ft. X 2ft. 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™ CX2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.

Customer Reviews

Review: Len Matthies from Smithville, Mo. USA Submitted: 6/30/2013

Product Rating5 out of 5 stars.

verified buyer


Got my sound!
Product Rating

Your general opinion of this product.

I bought a Blackstar HT5 mini stack but wasn't real set on the sound and the started to growl out at. 3/4 volume. I went looking for some Celestions to replace the Black Bird 50's but decided to take a chance on these. I was glad. It gave my mini stack a more melodic sound. Nice, crisp sound on lead and at 3/4 volume this mini roars. It was a very good improvement to the original sound. You buy a Blackstar mini stack- order 2 of these with it.

They are made very well and look sharp.

A very melodic sound with bright, snappy highs.

Speaker really stands out in looks.

I think they will pull the load when called on.

Review: Norm from New Mexico Submitted: 2/4/2012

Product Rating5 out of 5 stars.


Great Vintage Tone

No probs

had them 2 years now just got better with time

Your general opinion of this product.

Just as good if not better than Greenbacks


Great as i said they get better with time

Review: Eric Erickson from Roswell, Georgia Submitted: 6/27/2008

Product Rating4 out of 5 stars.


Great speaker

Very high... The two speakers I received were made several months apart. Regardless, their AC impedance, DC resisitance and inductance were all within 2%.


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