Can I use your N22 amplifier with the HDP6?
The N22 can work with the HDP6s, but we would recommend using the speakers with an amplifier that can provide more power to the speakers than the N22 can provide.
Support Type: HDP6 Passive Speakers|Knowledge Base
Why don’t the HDP6 speakers have built in amplifiers similar to the A2+ and A5+ Classic active systems?
The HDP6 came about from requests from customers that already have our powered speakers and/or have a music system and needed speakers but wanted the same Audioengine sound from a passive speaker.
Can I use the HDP6 passive speakers with the Audioengine S8 sub?
Yes! You would just need an amp to supply power to the HDP6 speakers and connect to the S8.