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Eminence Delta Pro-8A 8" Midrange 8 Ohm

Brand:|Model: Delta Pro-8A|Part # 290-507
Eminence's Eminence Delta Pro-8A 8" speaker features a large 59 oz. ferrite magnet and thermally efficient cast aluminum basket, making it a top choice for pro audio loudspeakers, including line arrays.
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List Price$104.99
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Part # 290-507
  • Massive 59 oz. ceramic ferrite magnet
  • Die-cast aluminum basket
  • High power handling and efficiency

Product Details

Eminence Delta Pro-8A 8" Midrange 8 Ohm

The Eminence Delta Pro-8A 8" Midrange/Midbass driver is optimized for professional audio or MI (musical instrument) speaker system applications. Its truncated cast aluminum basket is great for stacking in a line array. The heat sink-style fins between the frame and magnet provide critical cooling to the voice coil, thereby reducing power compression and increasing wattage capacity.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)225 Watts
  • Power Handling (max)450 Watts
  • Impedance8 ohms
  • Frequency Response100 to 3,000 Hz
  • Sensitivity97.8 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight59 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)69 Hz
  • DC Resistance (Re)5.6=40 ohms
  • Voice Coil Inductance (Le)0.82 mH
  • Mechanical Q (Qms)6.43
  • Electromagnetic Q (Qes)0.22
  • Total Q (Qts)0.22
  • Compliance Equivalent Volume (Vas)0.65 ft.³
  • Mechanical Compliance of Suspension (Cms)0.28 mm/N
  • BL Product (BL)14.1 Tm
  • Diaphragm Mass Inc. Airload (Mms)19g
  • Maximum Linear Excursion (Xmax)3 mm
  • Surface Area of Cone (Sd)218.2 cm²
Materials of Construction
  • Cone MaterialPaper
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8.02"
  • Baffle Cutout Diameter7.36"
  • Depth3.75"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.04 ft.³
  • Sealed F3268 Hz
  • Vented Volume0.09 ft.³
  • Vented F3176 Hz
Eminence Delta Pro-8A 8" Midrange 8 Ohm
  • BrandEminence Speaker
  • ModelDelta Pro-8A
  • Part Number290-507
  • UPC876358001613
  • Product CategoryPro Woofers, Subwoofers & Midrange Speakers
  • Unit of MeasureEA
  • Product Rating
    (2 Reviews)
  • Weight11 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Eminence Delta Pro-8A 8" Midrange 8 Ohm
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Eminence Delta Pro-8A 8" Midrange 8 Ohm
Eminence Delta Pro-8A 8" Midrange 8 Ohm is rated 5.0 out of 5 by 2.
Rated 5 out of 5 by from Eminence Delta Pro 8aBought 4 for some small floor wedges, and these are excellent! Great for vocal and guitar monitors. My boxes are sealed and about a cubic foot each, so the volume drops off below ~200 Hz. Nice clarity and detail for vocals, keys and guitars, and now I have tiny, lightweight wedges.
Date published: 2013-08-18
Rated 5 out of 5 by from Superb detail - with guts!For something that can chase you out of the living room - this is a one beautiful sounding driver. I have it in a 2-way with the equally great Radian 475PB, using a second order Linkwitz-Riley design. Crossed at 1270Hz, the detail and smoothness of the Eminence is almost indistinguishable from the 475PB in the crossover range. Of course, I'm also using Alpha-Core foil inductors, Sonicaps and Mills resistors, so I'm getting great detail anyhow, but I'm still impressed with the effortless warmth and detail the Pro-8A produces.The only negative when using it as a residential speaker, is that with the bigger magnet and cast frame you get weight - especially considering that I'd like the option of using it as a large bookshelf unit. But my basic design uses an aluminum, skeletal frame with a separate, custom sound chamber, so I can somewhat work around the problem - but with the Radian, they're still heavy.My main goal, after all, was to have great sound with power and I don't think there's a better combination to produce that in a small package, than with both of these great American-Made drivers!
Date published: 2012-01-05
  • 2016-02-08T06:23CST
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  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
Eminence Delta Pro-8A 8" Midrange 8 Ohm

I have an existing cabinet w/ .145 cu ft internal volume. Would like to put in an Eminence Delta Pro-8. Front panel currently has 2 ports@ 1.5" dia. ea. Wondering what is the lowest frequency I can reasonable expect from this cabinet and at what power?

Asked by: rs18041
If that volume is accurate, you will not be able to get anything useful below about 100 Hz.With two 1.5" diameter ports at 4" long your tuning frequency is 130 Hz. The driver will handle 225 watts down to 100 Hz with this alignment.
Answered by: MattP
Date published: 2014-08-19

Can someone post the actual dimensions for this unit? Across the flats and overall diameter. And shame on Eminence for not providing this. 

Asked by: mmaki
The diameter of this driver corner to corner is 9-3/8" and flat edge to flat edge is 8".
Answered by: MattP
Date published: 2014-03-31

What's the best enclosure for this speaker? Please be detailed

Asked by: Bad Brad
The recommended enclosure for this driver is 0.35 cubic feet with a 3" diameter port that is 3" long. This will provide a tuning frequncy of 100 Hz which is about as low as you want this driver to play.
Answered by: MattP
Date published: 2013-01-21
  • 2016-02-08T07:09CST
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