HD Audio Rockford Stage 2 vs Stage 3 – We Found the Real Amplifier Upgrade Your Harley Audio Needs!

Everyone wants to know – if you spend $1,200 upgrading your Harley-Davidson’s Stage 2 to the factory Stage 3 audio kit, how much louder and better does it really get?

We put both systems to the test on a 2023.5 Harley with Skyline OS using:
• Frequency response testing with an RTA
• SPL (sound pressure level) measurements

The results? Stage 3 only gave us a 0.7 dB increase over Stage 2 – hardly worth $1,200 if you’re chasing volume and clarity.

But then… we swapped the factory “500-watt” amp for a Hertz SP4.900, added the SeirenHD HD-A2B8 interface, and tuned it perfectly for the Rockford Stage 3 speakers. The difference? Over 6 dB louder – and way cleaner.

If you’ve already bought a Stage 2 or Stage 3 system, this is the upgrade that will finally unleash your Harley’s audio potential.

📍 Learn more & get your Harley sounding right:
https://volunteeraudio.com/products/h...

👉 Whether you're upgrading your factory system or going full custom, this test gives you real data – not just opinions.

We build custom amplifier & speaker upgrade packages using the best brands for your Harley-Davidson®!
✔ 100% Plug & Play – No cutting, No splicing!
✔ DIY or Professional Installation Available
✔ Step-by-Step Install Videos at VolunteerAudio.com!

💰 Need Financing? Get 0% Interest for up to 24 months through Affirm or PayPal Credit!

More on Affirm here:
https://www.affirm.com/how-it-works

📞 Call us today at 1-844-30AUDIO for pricing, options, and installation appointments!

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