pedwar
Established Member
Hi Guys,
Thought I'd ask here as I'm sure there are people here with masses more knowledge than me on this subject...
I've got an SVS PB200 Pro Ported sub. My room is about 16ft x 11ft (with no door at the moment), no traps/treatment yet and has carpet and soft furnishings....
I've EQ'd things so I get a reasonable response at my MLP from a single sub (had to pull down (-12db) a large room mode at 37Hz and there's another I pickup at about 71hz in some areas but at MLP actually gives me a tiny dip so I EQ that up ~3dB).
My question is... Why EVEN when I put the UMIK-1 Mic ~4" from centre point between the cone and ports I still get a similar response curve to what I see in my room?
I also see the same if I put the mic 4" - 5" inside the port on the subwoofer.
Are room modes really that strong that cancellation is occurring 'inside' the sub's cabinet? I mean I guess the cabinet is only 25mm or so MDF so I would expect waves to bounce back through it, itself.
I see the same in other locations in the room as well.
I guess the term 'in-room' response literally means that in this case? i.e. it's not just performance at different points in the room... it's literally that units performance 'in-room' ? If so, I'm glad I went with the ported unit instead of sealed as I was actually worried it would give me too much low end
I was quite surprised I don't see any room gain in the lower region (although I probably need a bigger room for the very low frequencies which is why I'm seeing a 37Hz peak).
This is the curve I see from my MLP (neighbours were home so ignore the low dBs.. the curve is the same at higher volumes).
Yellow = Ported Mode, Green = Sealed mode (with bungs).
I mean I can EQ things up a bit with DynamicEQ or a house curve, but was surprised I don't see more naturally.
Thought I'd ask here as I'm sure there are people here with masses more knowledge than me on this subject...
I've got an SVS PB200 Pro Ported sub. My room is about 16ft x 11ft (with no door at the moment), no traps/treatment yet and has carpet and soft furnishings....
I've EQ'd things so I get a reasonable response at my MLP from a single sub (had to pull down (-12db) a large room mode at 37Hz and there's another I pickup at about 71hz in some areas but at MLP actually gives me a tiny dip so I EQ that up ~3dB).
My question is... Why EVEN when I put the UMIK-1 Mic ~4" from centre point between the cone and ports I still get a similar response curve to what I see in my room?
I also see the same if I put the mic 4" - 5" inside the port on the subwoofer.
Are room modes really that strong that cancellation is occurring 'inside' the sub's cabinet? I mean I guess the cabinet is only 25mm or so MDF so I would expect waves to bounce back through it, itself.
I see the same in other locations in the room as well.
I guess the term 'in-room' response literally means that in this case? i.e. it's not just performance at different points in the room... it's literally that units performance 'in-room' ? If so, I'm glad I went with the ported unit instead of sealed as I was actually worried it would give me too much low end
I was quite surprised I don't see any room gain in the lower region (although I probably need a bigger room for the very low frequencies which is why I'm seeing a 37Hz peak).
This is the curve I see from my MLP (neighbours were home so ignore the low dBs.. the curve is the same at higher volumes).
Yellow = Ported Mode, Green = Sealed mode (with bungs).
I mean I can EQ things up a bit with DynamicEQ or a house curve, but was surprised I don't see more naturally.