Hi everyone, I've been reading a ton about subs lately and have the increasing urge to finally build an active one. At the moment I have some Mackie CR3 speakers on my desk and a Jamo Sub210 8" under my desk hooked up to my PC. The subwoofer really fills the sound out but it doesn't really go far below ~50hz or so.
The room I'm in isn't large at all, 2.2mx3.2m roughly (plus a wardrobe, desk, a couple of PCs etc) which made me think about Hoffmans iron law. I dont need loud plus the room is small, I just need small and low! The Mackies max out at 97dB per pair, I rarely have them over halfway.
I have some experience using WINISD however I'm unsure of what I'm aiming for in terms of response. On the Transfer function mangitude graph, am I supposed to be making the longest flattest line possible with a steeper rolloff or a nice even curve?
I've been looking at the SB Acoustics SB29SWNRX-S75-6. If I go for a 1.75ft^3 (50L) box with a 24hz (4x30 inch port) tuning I get this
80W signal results ~103dB output -3dB being at ~23hz, port air velocity just under 16m/s.
I know it's almost pointless asking but how would this compare to the Jamo I already have? It's roughly a ported 12" Cube, 8" driver and boasts -3dB 38-200hz but there is already noticeably lower SPL below 50hz.
Also I keep reading that we don't perceive lower frequency waves as well so how would I work out how many dB I need to keep up with the 97dB Mackies?
I know it's a lot of questions at once so feel free to take a stab at any/all of them and I'm fully open to suggestions.
I'm also aware that this will most likely be an awful return on investment, especially as a first timer. I wouldn't mind spending up to £300ish if it will get me decent results.
EDIT: Not sure why the picture isn't loading up. Uploaded to imgur and inserted using the forum.
The room I'm in isn't large at all, 2.2mx3.2m roughly (plus a wardrobe, desk, a couple of PCs etc) which made me think about Hoffmans iron law. I dont need loud plus the room is small, I just need small and low! The Mackies max out at 97dB per pair, I rarely have them over halfway.
I have some experience using WINISD however I'm unsure of what I'm aiming for in terms of response. On the Transfer function mangitude graph, am I supposed to be making the longest flattest line possible with a steeper rolloff or a nice even curve?
I've been looking at the SB Acoustics SB29SWNRX-S75-6. If I go for a 1.75ft^3 (50L) box with a 24hz (4x30 inch port) tuning I get this
An externally hosted image should be here but it was not working when we last tested it.
80W signal results ~103dB output -3dB being at ~23hz, port air velocity just under 16m/s.
I know it's almost pointless asking but how would this compare to the Jamo I already have? It's roughly a ported 12" Cube, 8" driver and boasts -3dB 38-200hz but there is already noticeably lower SPL below 50hz.
Also I keep reading that we don't perceive lower frequency waves as well so how would I work out how many dB I need to keep up with the 97dB Mackies?
I know it's a lot of questions at once so feel free to take a stab at any/all of them and I'm fully open to suggestions.
I'm also aware that this will most likely be an awful return on investment, especially as a first timer. I wouldn't mind spending up to £300ish if it will get me decent results.
EDIT: Not sure why the picture isn't loading up. Uploaded to imgur and inserted using the forum.
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