5 out of 5
Eminence Beta-8A 8" Midrange/PA Driver
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Pricing Note
Product Description
Manufacturer Part Number: Beta-8A
Eminence's durable and efficient Beta-8A 8" speaker features extremely smooth frequency response and high power handling. Its performance rivals that of speakers costing much more!
Key Features:
Overview:
Eminence Beta-8A 8" Midrange/PA Driver
The Eminence Beta-8A 8" Midrange/PA Driver's performance is optimized for midrange use between 400 Hz and 4 kHz in multiway systems. The Beta-8A is also suitable for vocal PA, keyboards, stage monitors, and bass guitar.
Specification:
Manuals & Resources:
Eminence's durable and efficient Beta-8A 8" speaker features extremely smooth frequency response and high power handling. Its performance rivals that of speakers costing much more!
Key Features:
- Kapton coil former
- Polyamide-imide coated copper voice coil
- Ferrite magnet
- Pressed steel basket
- Paper cone
- Cloth accordian surround
- Solid composition paper dust cap
Overview:
Eminence Beta-8A 8" Midrange/PA Driver
The Eminence Beta-8A 8" Midrange/PA Driver's performance is optimized for midrange use between 400 Hz and 4 kHz in multiway systems. The Beta-8A is also suitable for vocal PA, keyboards, stage monitors, and bass guitar.
Specification:
Product Details | |
|---|---|
| Brand | Eminence Speaker |
| Model | Beta-8A |
| Part Number | 290-404 |
| UPC | 876358000067 |
| Unit of Measure | Each |
| Weight | 7 |
Product Specifications | |
|---|---|
| Nominal Diameter | 8" |
| Power Handling (RMS) | 225 Watts |
| Power Handling (MAX) | 450 Watts |
| Impedance | 8Ω |
| Frequency Response | 78 to 4,500Hz |
| Sensitivity | 95.1dB 2.83V/1m |
| Voice Coil Diameter | 2" |
Thiele-Small Parameters | |
|---|---|
| Resonant Frequency (Fs) | 65Hz |
| DC Resistance (Re) | 5.99Ω |
| Voice Coil Inductance (Le) | 0.49mH |
| Mechanical Q (Qms) | 4.95 |
| Electromagnetic Q (Qes) | 0.42 |
| Total Q (Qts) | 0.38 |
| Compliance Equivalent Volume (Vas) | 0.82ft³ |
| Mechanical Compliance of Suspension (Cms) | 0.37mm/N |
| BL Product (BL) | 9.6T·m |
| Diaphragm Mass Inc. Airload (Mms) | 16g |
| Maximum Linear Excursion (Xmax) | 3mm |
| Surface Area of Cone (Sd) | 210cm² |
Materials of Construction | |
|---|---|
| Cone Material | Paper |
| Surround Material | Cloth |
| Voice Coil Wire Material | Aluminum |
| Voice Coil Former | Kapton® / Polyimide |
| Basket / Frame Material | Steel |
| Magnet Material | Ferrite |
Mounting Information | |
|---|---|
| Overall Outside Diameter | 8.24" |
| Baffle Cutout Diameter | 7.13" |
| Depth | 3.5" |
| # Mounting Holes | 8 |
Parts Express Staff Recommended Enclosure Volume | |
|---|---|
| Sealed Volume | 0.4ft³ |
| Sealed F3 | 150Hz |
| Vented Volume | 0.6ft³ |
| Vented F3 | 75Hz |
Manuals & Resources:
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Need more information?
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Our staff are available to answer any questions you may have about this item
Customer Reviews
By Bruce Leonard
Date: November 26, 2025
Awesome sound, worth every penny.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By A Customer
Date: May 24, 2025
Killer Speaker
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By gorilla
Date: May 06, 2025
It works in my old Mackie, but if it gets too loud with even coming close to lets say 34;half way34; in terms of the bass adjustment... it starts popping bad.
Rating: 
[3 of 5 Stars!]
[3 of 5 Stars!]
By Ozzie Smith
Date: February 24, 2025
I liked the ease of installation of this speaker to a cabinet purchased in 1973. I am glad to know that I can find replacement speakers if needed in the future.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Danny
Date: January 01, 2025
Whenever you need a very good top-end speaker for your music system, this is the speaker to have. The voice quality is superb. Just make sure that your top-end power amps is of good quality (e.g Crown power amps) to deliver the quality sound.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By A Customer
Date: December 17, 2024
Perfect fit and sound..
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]