I found out sonosubs and older receivers confuse me more than anything. 03roadking prefers his sonosub with the port off on the top so it is more like an OB. There is a noticeable difference in sound. It sounds louder and kind of boomier with it off. I did not notice much of a difference in REW's waterfall graphs though. So either those nulls reduce a noticeable difference or we are sensitive in the time domain
Calibrated sound card with calibrated EMC800. Both were attached.
Chart 1 - The green and orange show both his seating locations with the port off (ob). I only went to 40 Hz since I didn't want to mess with the driver. The teal and purple show both seating locations with the port on top. With the port on, the response changes dramatically. What I am concerned about is the extension of the sub. (Not full sealed?)
Chart 2 - The pink line shows what he manually sets and prefers for sound with the ports off (OB). I believe he has boosts down to 20 Hz.
Chart 3 - I was planning on level matching the mains so I wanted to see what happened out further. There is about a 10 dB average droppoff from 330-500 Hz
Chart 4 - We should of moved the sonotube into the middle of the room but I was getting antsy since I had plans later. This shows two close mics with the mains on and two without the mains on. There is some strange cancellation that occurs around 70ish Hz. That null appears in the room response too with the port on. I should of took an OB close mic also.
Chart 5 - The blue shows the close mic near the ports and the green shows the close mic near the driver. I was expecting more extension with the blue measurement.
If anyone has any thoughts please help. He is happy with the top off though. I'm just worried about bottoming the driver during movies. I think the driver has a ton of potential. I do prefer working with sealed cabs though
It was funny running into your wife at Carlos last night. Her friend really embarrassed me when she said, oh he's the sound system guy haha