Knocking/Whooshing sound on pss555-8 21"
So, I recently built a box around the pss555-8 21" "PA" subwoofer, and I've been having this like knocking/whooshing problem coming from the sub driver itself. I tuned the box around 33hz, made sure to have adequate supports and sound dampening foam. I used a slot port on the bottom of the box that is 22 1/2 inches wide and 3 inches tall, going around 17 inches deep. I have a 1 1/2 thick baffle, used MDF for the whole build. Another thing to mention is the amp that I'm currently using is the Fosi audio bt30d pro, Not a pa amp. Chat gpt told me on the 36v 5a power brick on 8ohms that i was getting no more than 100w out of the sub channel on that amp. I have zero eq on the sub as it is passive and directly plugged into the amp using the amps built in crossover. Where I'm currently at is that the amp may be clipping at higher volumes, and that I would need a better amp. The sub sounds great at lower volumes but all bass disappears at higher volumes and I get that whooshing / knocking sound. The sub has deep bass but lacks midbass output, is that an eq issue or do i just need more power into the driver? The driver is brand new and is rated 1000w rms, and it makes this knocking at 100w, I would like to send way more into it from a better amp, but unsure if the knocking/whooshing would sound worse. Lastly its currently in a basement with pretty horrible acoustics and nulls, so that may also be a large issue, although I do eventually plan to bring the sub outdoors.
I used win isd to tune the driver and got parameters from the Loudspeaker database
Any suggestions? anything would help, Thank you
