Compare AVT 6.5-inch and 8-inch ported speaker enclosure pairs for Road Glide fairing audio builds. Both are empty matching left/right pairs in matte black / charcoal ABS. Start with the motorcycle application and exact speaker clearance, then choose the enclosure size.
| Detail | 6.5-inch pair | 8-inch pair |
|---|---|---|
| Choose your size | Shop the 6.5-inch pair | Shop the 8-inch pair |
| Motorcycle application | Motorcycles using the same factory speaker enclosure as the 2017 Harley-Davidson Road Glide. Confirm replacement fairings and custom installations with AVT. | |
| Inner-fairing vent outlet | No modification required. | A small modification is required. |
| Speaker selection | PRV 6MR500-NDY-4, 4-ohm, is the documented prototype test pairing. Confirm clearance for other speakers. | Confirm the exact speaker's frame, mounting depth, magnet, terminals and mounting holes with AVT. |
| Included | One empty left/right ABS enclosure pair. Speakers, hardware, grilles, wiring and accessories are not included. Reuse stock enclosure mounting hardware. | |
| Development evidence | Historical models and 6.5-inch prototype measurements. | Historical multi-driver models and August 26, 2026 prototype measurements. |
Nominal speaker diameter does not establish fit. Development charts are not universal fitment lists or guaranteed production output ratings.
6.5-inch pair: $525. 8-inch pair: $575. Shipping included for both. Made to order. Ships in 2–3 days.
The 8-inch version requires a small modification to the inner fairing vent outlet. The 6.5-inch version does not require that modification.
The PRV 6MR500-NDY-4, 4-ohm speaker was used in the 6.5-inch prototype's installed acoustic testing. Historical enclosure and multi-driver models add context for midbass, cone motion and speaker selection. The 6.5-inch version does not require the inner-fairing vent-outlet modification.
See the 6.5-inch enclosure, charts and development evidence
The contoured 8-inch enclosure has an integrated scroll port. Its development comparisons show how different speaker choices change modeled response and output limits. August 26 on-bike cone/port and both-speaker rider measurements add real prototype evidence. Confirm exact speaker clearance with AVT and allow for the required small inner-fairing vent-outlet modification.
See the 8-inch enclosure and speaker/output comparisons
Each product page includes existing engineering comparison charts, a practical takeaway and links to full-size views. Modeled results are labeled with their assumptions and kept separate from each prototype's on-bike measurement history. Use them to plan the system with AVT; they are not a guaranteed output rating or a universal speaker-fitment list.
Both products are supplied as empty matching pairs. Select speakers, amplification, processing and wiring separately. The approved photographs and silent 360-degree views show the actual enclosure designs.
AMERICAN V TWIN / AVT ENCLOSURES
The enclosure is part of the audio system. Start with the motorcycle application, then confirm the exact speaker and the rest of the build.
$525 per empty pair including shipping. Matte black / charcoal ABS. Made to order; ships in 2–3 days.
No inner-fairing vent-outlet modification required.
One enclosure shown; sold as a pair.
$575 per empty pair including shipping. Matte black / charcoal ABS. Made to order; ships in 2–3 days.
Requires a small inner-fairing vent-outlet modification.
One enclosure shown; sold as a pair.