DS18 6.5” 250 Watts RMS 4-Ohm High-Sensitivity Pro Loudspeaker w/ Ferrite Magnet

• HIGH POWER MIDRANGE PERFORMANCE: DS18 6PRO500MR-4 delivers 250W RMS / 500W MAX for aggressive, high-output sound in pro audio and SPL systems
• EXTREME 103DB SENSITIVITY: Ultra-efficient design produces louder output with less power, making it ideal for high-volume builds
• CLEAR VOCALS AND STRONG PROJECTION: Wide 100Hz–12.5kHz frequency range allows vocals and instruments to cut through heavy bass systems
• FERRITE MOTOR WITH COPPER RING: Strong motor structure with demodulating ring reduces distortion and improves overall sound clarity
• HIGH-TEMP 1.75" VOICE COIL: Kapton former with CCAW winding increases durability and maintains performance under heavy load
• BUILT FOR LOUD SYSTEMS: Steel basket and cloth surround provide long-lasting reliability in daily and competition builds
• OPTIMIZED FOR PRO AUDIO APPLICATIONS: Designed for amplified systems requiring strong midrange presence and output
• REQUIRES HIGH PASS FILTER: Recommended crossover at 140Hz or higher to protect the speaker and ensure clean performance

DS18 6.5†250 Watts RMS 4-Ohm High-Sensitivity Pro Loudspeaker w/ Ferrite Magnet

This listing includes

• (1) DS18 6PRO500MR-4 6.5†Midrange Speaker

If your system sounds loud but your vocals disappear†this is the fix.

The DS18 6PRO500MR-4 is built for projection, clarity, and raw midrange authority.

103dB sensitivity means it doesn’t just play†it cuts through everything else in the system.

This is not a “fill speaker.â€

This is your front-stage weapon.

The DS18 6PRO500MR-4 is built for one thing—output. With 250W RMS power handling and ultra-high 103dB sensitivity, this 6.5†pro audio midrange cuts through any system with aggressive, crystal-clear sound.

Designed for high-output builds, it delivers strong vocal projection and instrument clarity while maintaining control at extreme volume levels. Whether you're building a loud daily or an all-out SPL setup, this speaker brings serious midrange authority.

Features:

• 250W RMS / 500W MAX power handling


• 103dB ultra-high sensitivity (LOUD with less power)


• Wide frequency response: 100Hz – 12.5kHz


• Ferrite motor for strong, consistent output


• Copper demodulating ring reduces distortion


• 1.75†Kapton voice coil (heat-resistant, efficient)


• Cloth surround for durability in high-output systems


• Built for SPL and aggressive daily builds

Specifications

• Nominal Diameter: 6.5" (165mm)


• Midrange Loudspeaker Speaker


• RMS: 250 Watts


• Max: 500 Watts


• Impedance: 4 Ohms


• Sold As: Single


• Sensitivity (1W/1M): 103 dB


• Frequency Response: 100Hz – 12.5kHz


• Recommended High-Pass Crossover: 140Hz


• Voice Coil: 1.75" Kapton / CCAW


• Magnet: Ferrite (48 oz)


• Magnet Type: Ferrite


• Magnet Weight: 48 oz


• Demodulating Ring: Copper Ring


• Voice Coil Diameter: 1.75" (44.5mm)


• Voice Coil Former: Kapton


• Winding Material: CCAW


• Cone Material: Paper


• Cone Shape: Curvilinear


• Surround Material: Cloth


• Spider Diameter: 3.8" (96mm)


• Dust Cap Material: Paper


• Basket Material: Steel


• Basket Finish: Black


• Speaker Terminals: Push Terminal (16ga compatible)


• Leads Connection: Spider Crossed

Thiele & Small Parameters

• Fs (Resonance Frequency): 130Hz


• Qms (Mechanical Factor): 1.17


• Qes (Electrical Factor): 0.32


• Qts (Total Factor): 0.25


• Vas (Equivalent Volume): 7.25L / 0.256 ft


• Xmax (One Way Excursion): 1.1mm


• BL Factor: 7.95


• Mms (Mechanical Mass): 7.59g


• Cms (Compliance): 0.19 mm/N


• Le (Inductance): 0.33mH


• Re (DC Resistance): 3.2 Ohms


• Sd (Cone Area): 165.13 cm

Dimensions:

• Overall Diameter: 6.85" (174mm)


• Overall Depth: 3.6" (92mm)


• Mounting Depth: 3.36" (85mm)


• Cutout Diameter: 5.9" (150mm)


• Motor Diameter: 5.5" (140mm)

What It Is Best For

• Loud door builds


• SPL setups


• Systems that need vocals to punch through bass


• Pairing with tweeters for full pro-audio front stage

Important Setup Note: These are NOT full-range speakers.

• You MUST run a high-pass crossover at 140Hz or higher


• Do NOT run off head unit power


• These are designed for amplified pro audio setups

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

• Bancontact
• iDEAL

Bank Transfers

• Zelle

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.