SoundXtreme 5x7/6x8 3-Way Car Speakers 350W Pair

These are SoundXtreme 5x7/6x8" 3-way coaxial car speakers, rated 350 watts peak per pair, built to replace factory units with clearer mids, tighter bass and a balanced PEI tweeter for crisp highs. Upgrading worn or weak factory speakers is the fastest way to improve in-car sound without a full audio overhaul. The SoundXtreme SX ST-680 pair fits common 5x7 and 6x8 openings and delivers a selectable operating range of 10–75 watts RMS per channel, making them compatible with most OEM head units and aftermarket amps. Their polypropylene mid-woofer, polyester-foam surround and PEI dome tweeter combine to broaden frequency response while keeping installation straightforward.

How do these speakers change everyday listening while driving?

These 3-way coaxial speakers separate midrange, low and high frequencies so vocals, guitars and cymbals sound more distinct in busy cabin environments. The extended voice coil (EVC) and neodymium motor structure increase dynamic control, reducing distortion at common driving volumes. Expect clearer midrange presence and more defined high end than typical factory cones.

• Balanced PEI dome tweeter for detailed highs and voice clarity
• Polypropylene mid-woofer with foam surround for durable mid-bass
• CEA-rated peak power 350W per pair, recommended 10–75W RMS

Will these fit my car and how hard is installation?

The ST-680 is sized for 5x7 or 6x8 mounting locations with a cutout dimension of approximately 5" x 7-3/16" and a shallow top-mount depth of 3/8", so they fit many door and rear-deck openings. The stamped steel frame and included screws and speaker wire let you swap them into place without special adapters for most vehicles. Always check your vehicle's mounting depth and cutout first and keep the user manual handy for wiring guidance.

• Cutout dimensions: 5" x 7-3/16" — measure your opening before buying
• Top-mount depth: 3/8" — designed for space-limited installations
• Includes screws, speaker wire and user manual for basic installs

What sound specs and hardware matter for daily use?

The ST-680 pair operates at 4 ohms impedance and offers a sensitivity of 90 dB, giving useful volume from lower-powered head units while remaining amp-friendly. Frequency response spans 45–20,000 Hz, covering essential bass through high frequencies for balanced playback of genres from podcasts to pop. The neodymium magnet motor and PEI tweeter add efficiency and clarity without excessive coloration.

• Impedance: 4 ohms for broad head unit compatibility
• Frequency response: 45–20,000 Hz for full-range coverage
• Sensitivity: 90 dB — good output with stock radios

How much power should I pair with these speakers?

SoundXtreme recommends a continuous RMS range of 10–75 watts per channel to get the best balance of headroom and safe operation. A factory head unit typically provides enough power for comfortable listening; adding a modest aftermarket amp (within the recommended RMS) improves dynamics and reduces clipping at higher volumes. Avoid overpowering beyond the recommended RMS to prevent damage over time.

• Peak handling: 350 watts per pair (CEA-rated)
• Recommended RMS: 10–75 watts per channel for reliable performance
• Use a compatible amplifier to maximize clarity without distortion

Who is this for? These SoundXtreme ST-680 speakers are aimed at drivers who want a noticeable audio upgrade without a full system rebuild: owners of older cars with weak factory speakers, budget-conscious audiophiles seeking clearer mids and highs, and DIY installers who need a low-profile, easy-fit 5x7/6x8 solution. They balance affordability with durable materials—polypropylene cones, foam surrounds, and PEI tweeters—so you get long-lasting, more musical sound at a modest price.

• Package contents: 1 pair SX ST-680 speakers, speaker wire, screws, user manual

FAQ

Q: Do these speakers fit a 5x7 opening?

A: Yes. The ST-680 fits 5x7 and 6x8 openings; cutout is about 5" x 7-3/16". Measure your mounting hole to confirm.

Q: What amplifier power is recommended?

A: Use 10–75 watts RMS per channel for optimal performance; the pair is rated 350W peak.