- Built for the Road: Designed for motorcycles and powersports, this 8" midrange speaker is water-resistant (IP66 rated) and reinforced for harsh conditions and high-speed rides.
- High Output Performance: Delivers 500W max and 250W RMS with a 4 Ohm impedance, allowing you to push more power from your amp without bridging.
- Loud and Clear Sound: With 97 dB sensitivity and a frequency response from 65 Hz to 12 kHz, it delivers rich mids that cut through road noise and wind.
- Slim, Versatile Fit: Compact 2.5" mounting depth and 7" cutout diameter make it perfect for motorcycles, ATVs, and shallow installs where space is limited.
- Ferrite Motor Strength: Traditional ferrite magnet design offers stable power handling and durability in a rugged, high-vibration environment.
PRO 8" 250W RMS 4-Ohm Slim Water-Resistant Midrange Loudspeaker PRO-SM8.4
This listing includes:
- (1) DS18 8" Marine Speaker Waterproof PRO-SM8.4
Built for motorcycles, powersports, and other demanding open-air applications, the DS18 PRO-SM8.4 is designed to deliver strong, clear midrange performance in environments where standard speakers struggle. With 250 watts RMS / 500 watts MAX, this 8-inch shallow-mount loudspeaker gives riders the output they need while maintaining a slim profile for tighter installs.
The PRO-SM8.4 features a water-resistant paper cone, dust cap, and coated cloth surround, helping it stand up to rain, moisture, and harsh outdoor conditions. Its IP66 water-resistant rating adds extra confidence for motorcycle audio systems and other exposed setups. A 97dB sensitivity rating helps this speaker play loud and efficiently, making it a strong choice for systems where high output matters.
DS18 designed this speaker with a 1.5-inch Kapton voice coil, 25 oz ferrite magnet, and steel basket for reliable power handling and durability. The 2.5-inch mounting depth makes it easier to fit into shallow locations where deeper pro audio speakers may not work. Whether you're upgrading a motorcycle fairing system or building a custom outdoor audio setup, the DS18 PRO-SM8.4 brings strong midrange projection, weather-resistant construction, and installation flexibility.
Features
- 8" Shallow Midrange Speaker 500W MAX / 250W RMS
- 4-Ohm Impedance for Easy Amplifier Matching
- Water-Resistant Cone, Dust Cap, and Cloth Surround
- High Sensitivity (97dB) for Clear, Loud Output
- 1.5" Kapton Voice Coil with 25oz Ferrite Magnet
- 2.5" Mounting Depth for Versatile Install Options
Specifications:
- RMS Power: 250 Watts
- MAX Power: 500 Watts
- Frequency Response: 65Hz - 12KHz
- Voice Coil Diameter: 1.5" (38mm)
- Voice Coil Material: Kapton
- Winding Material: CCAW
- Cone Material: Water-Resistant Paper
- Surround Material: Coated Cloth
- Basket Material: Steel
- Basket Color/Finish: Gloss Red
- Nominal Impedance: 4 Ohms
- Sensitivity: 97dB
- Magnet Weight: 25 Oz
- Magnet Material: Ferrite
- IP66 Water Resistant
Thiele & Small Parameters
- Equivalent Volume: 24.96 L / 0.881 f3
- Excursion (one way): 1.3 mm
- Free Air Resonance: 110 Hz
- Mechanical Factor (Qms): 8.062
- Electrical Factor (Qes): 1.024
- Total Factor (Qts): 0.898
- Mechanical Mass: 10.132 g
- Mechanical Compliance: 0.416 mm/N
- BL Factor: 3.027
- Voice Coil Inductance: 0.364 mH
- Cone Area: 213.82 cm2
- DC Resistance: 3.2 ohms
- Mechanical Mass w/o Air: 9.98g
Dimensions:
- Overall Diameter: 8.23" (209mm)
- Overall Depth: 2.7" (69 mm)
- Front Mount Baffle Cutout: 7" (180 mm)
- Mounting Depth: 2.5" (63 mm)
- Motor Diameter: 4.72" (120 mm)
Accepted Payment Methods at Big Jeff Audio
At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:
Credit and Debit Cards
- Visa
- Mastercard
- American Express
- Discover
- Diners Club
Digital Wallets
- Amazon Pay
- Apple Pay
- Meta Pay (formerly Facebook Pay)
- Google Pay
- Shop Pay
- PayPal
International Payment Methods
Bank Transfers
Financing Options
We also offer financing options to make purchasing easier. Learn more about our financing options here.
- Klarna
- Affirm
- Sezzle
- Snap
- Acima
- Tiptop
If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.
Shipping Options and Delivery Time
Do You Offer Expedited Shipping?
Yes! At checkout, you can select from different shipping options:
- Standard Shipping: Free for orders over $100.
- Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.
How Long Does Delivery Take?
- Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
- Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.
What Happens If My Package Is Undeliverable?
If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.
Why Can’t I Track My Order?
If you're having trouble tracking your order:
- Make sure you’ve received the shipping confirmation email with the tracking number.
- Log into your account on our website and use the “Check Your Order Status” button.
- If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.
