SoundQubed HDX Series 3.5" Midrange Speakers (pair)

Product Overview

Give vocals and instruments a dedicated place in your car audio system with the SoundQubed HDX Series 3.5" midrange speakers. This 1-way, 4-ohm pair uses glass fiber cones, rubber surrounds, and 310g barium ferrite magnets, with 40W RMS power handling per speaker.

Key Features & Benefits

• Dedicated midrange design: The 1-way driver has no integrated tweeter, so you can build around separate midrange, tweeter, and woofer drivers.
• Glass fiber cone and rubber surround: These materials support detailed midrange reproduction with controlled resonance.
• 40W RMS power handling: The 4-ohm speaker is rated for 40W RMS and 120W maximum power.
• 140 Hz recommended high-pass: Use a high-pass crossover at 140 Hz to keep the driver within its recommended operating range.
• Compact mounting footprint: The 3.50" / 89mm overall diameter and 2.80" / 71mm baffle cutout help with planning a custom installation.
• Pair quantity: Two midrange drivers are included for a pair-based front-stage setup.

Technical Specifications

Driver Specifications

Thiele & Small Parameters

Speaker Measurements

Why Choose This Product?

The HDX Series 3.5" is built for systems that use a separate driver for midrange frequencies rather than relying on a full-range speaker. Its 86 dB sensitivity rating, 120 Hz–20 kHz frequency response, and compact size make it a focused option for a custom front-stage build.

For a three-way setup, the supplied pairing guidance calls for a dedicated 6.5" or 6x9" woofer with an 80–100 Hz low-pass crossover and a dedicated tweeter. The SoundQubed HDX Series 2.2" Titanium Dome Tweeter is suggested as a companion, with a 3.8 kHz high-pass crossover.

Installation & Compatibility Notes

• Use a high-pass crossover: Set the recommended high-pass crossover at 140 Hz. The driver is a dedicated midrange, not a full-range speaker.
• Plan the opening: Allow for a 2.80" / 71mm front-mount baffle cutout and 1.52" / 38.7mm mounting depth. Overall depth is 1.65" / 42mm.
• Choose a mounting location: A-pillar pods and custom mounts are identified as common installation locations. Check available space and mounting requirements for your vehicle.
• Account for the grille: No grille is included, so plan the mounting location and pod or baffle design accordingly.
• Match amplifier and crossover settings: The supplied guidance recommends a dedicated channel of a SoundQubed 4-channel amplifier, with the high-pass set at 140 Hz. For an active three-way build, it recommends a DSP to manage crossover points.

Frequently Asked Questions

Is the HDX Series 3.5" a full-range speaker?

No. It is a 1-way dedicated midrange driver with no integrated tweeter. Use a high-pass crossover at the recommended 140 Hz and pair it with a dedicated tweeter for a complete front stage.

What is the power rating and impedance?

Each speaker is rated at 40W RMS and 120W maximum, with a nominal impedance of 4 Ohms.

What cutout and mounting depth should I allow?

The front-mount baffle cutout is 2.80" / 71mm, and mounting depth is 1.52" / 38.7mm. Overall depth is 1.65" / 42mm.

Does the pair include grilles?

No. The specifications state that a grille is not included.

What tweeter and crossover guidance is provided?

The suggested companion is the SoundQubed HDX Series 2.2" Titanium Dome Tweeter, with a 3.8 kHz high-pass crossover. For an active three-way system, the supplied guidance recommends using a DSP to manage crossover points.

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