6.5" 125W RMS 8 Ohm Low Mid Frequency Loudspeaker Sealed Back APMB-6SB-E

• 6.5 inch low mid frequency loudspeaker designed for strong midbass and vocal clarity
• Handles 125W RMS and 250W max with high efficiency 91 dB sensitivity
• Sealed back steel basket isolates rear wave for clean sound and easy installs
• 1.5 inch high-temperature KSV voice coil with improved ventilation for durability
• Ideal for vehicle doors, pro audio builds, and tight mounting locations

6.5" 125W RMS 8 Ohm Low Mid Frequency Loudspeaker Sealed Back APMB-6SB-E

This Listing Includes:

• (1) APMB-6SB-E 6.5 inch Low Mid Frequency Loudspeaker

The APMB-6SB-E is a 6.5 inch low mid-range loudspeaker engineered for powerful midbass performance, clean vocal reproduction, and reliable operation in demanding audio systems. Designed as part of the Low Mid-Range Series, this speaker uses a cloth edge surround to enhance low-frequency response while maintaining clarity across the midrange.

Its sealed back steel basket design isolates the rear wave, protecting the speaker from external interference and eliminating the need for additional enclosure volume. This makes it ideal for tight installations, door panels, pro audio builds, and vehicle applications where space and control matter.

At the core is a 1.5 inch high-temperature KSV voice coil with improved ventilation, delivering consistent performance and durability under continuous power. With 125 watts RMS handling, 250 watts peak power, and high sensitivity, the APMB-6SB-E delivers strong output with excellent efficiency.

Easy-mount installation points, a rigid steel basket, and a 20 oz ferrite magnet complete a speaker built for performance, reliability, and clean sound reproduction.

Specifications:

• Model: APMB-6SB-E


• Speaker Size: 6.5 inch


• Nominal Impedance: 8 Ohm


• RMS Power Handling: 125 Watts


• Maximum Power Handling: 250 Watts


• Sensitivity: 91 dB (1W/1m)


• Frequency Response: 350 Hz – 5 kHz


• Voice Coil Diameter: 1.5 inch


• Voice Coil Former Material: KSV


• Winding Material: EISV


• Cone Material: Paper


• Surround Material: Cloth


• Basket Material: Steel


• Magnet Material: Ferrite


• Magnet Weight: 20 oz


• Design: Sealed back steel basket

Thiele and Small Parameters:

• Vas: 0.31 ft


• Fs: 470 Hz


• Qms: 2.05


• Qes: 1.76


• Qts: 1.0


• Mms: 24 g


• Cms: 63 m/N


• BL: 12


• Le: 0.18 mH


• Sd: 137 cm


• Re: 7.4 Ohms


• Mmd: 20 g

Dimensions:

• Overall Diameter: 6.6 inch (167 mm)


• Overall Depth: 2.5 inch (64 mm)


• Mounting Depth: 2.4 inch (60 mm)


• Front Mount Baffle Cutout: 5.7 inch (145 mm)


• Motor Diameter: 4.5 inch (115 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

• 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.

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