Speaker cabinet: open back vs closed back vs closed back with foam
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- Опубликовано: 15 сен 2024
- I made a comparison video of my 1x12 speaker cabinet.
It's a comparison of an open back vs closed back vs treated closed back with acoustic foam.
Microphone is a Shure SM57
The amp used is a EVH 5150 III (red channel)
The speaker is a Celestion G12-50GL Lynchback
I've been curious how open back would sound if you scooped the mids and tried to take advantage of the extended low end.
Open back is clearly a no-no for metal. Unless, you know, there is a drummer and bassist, and the bassist accurately tracks the root notes of your chords, one octave lower. :)
The closed foam sounds best to my ear. Thanks for doing this
I've A/B'ed that in a Marshall 1936 2x12 (plywood not MDF) and an EVH 4x12, and in both instances it (to my ears) sounded worse. I shot about 20 IR's on the 1936, and even after months, when testing, it still sounded worse. It might be due to this being a different cab and a 1x12, but good quality acoustic foam or polyfil is a tone suck IMO.
Try a semi open back cab as it sounds the best.
I just shaped a flat piece of shipping foam I had laying around and wedged it into the open space on the back of my cabinet.
I just sat down, turned on my pc and read your comment.
To me the point of open vs. closed is defeated if you are placing a mic right in front of the speaker.
The benefit of an open cab is best realized in the room, not right in front of the speaker.
While it's true that the open back interacts with a room, the point is not defeated at the close mic position. The microphone clearly picks up a difference. The mic is sensitive to the bass cancellation of the open back, and can sense the reflections coming from the rear panel of the closed back, which are attenuated with the stuffing.
towads the end, no backing track, I cleaerly hear the difference. The bass response is noticable & sounds much beter closed.
Yup, can confirm this
Yes, because the open back allows bass to escape out the back and cancel with the bass at the front, since it is opposite phase: e.g. when the speaker compresses air at the front, it decompresses at the back, and that basically sucks the pressure from the front to back. You've never seen a subwoofer with an open back. A tuned port facing forward, maybe, which is different.
Closed back definitely has more balls lol
I couldn't really hear a difference. Could you demo it again only with zero distortion?
On what kind of speakers are you listening to this? Differences are subtle but definitely noticeable. With distortion you hear differences WAY better than cleans.
That would be even less informative. Distortion is like a wide spectrum noise that clearly lets you hear frequency response differences. Think about when you tweak guitar tone with an EQ. The same EQ device is much more drastic with distortion then with clean! You move the knobs or sliders just a little bit and there is a huge difference, which is not so apparent with a clean tone.
Is the cab ported? I don’t see any holes.
Hi James, no, it's not ported. When the back is closed, the whole construction is closed.
@@ThevonMusic that might be some of what you’re hearing. I built my cabs as well, using the Bogner Cube as reference. They have two 2” ports along the bottom, this should allow the speaker it’s full throw, the motion back and forth at the voice coil. When you open the back, I heard more range, a more complex bottom character. When you closed the back, the tone tightened up, as though some of the bottom was lost.
I’ve enjoyed all your speaker videos and appreciate your engineering post EQ, as many others have complimented, great job.
Do a little research on speaker porting, this is to facilitate the speaker motion. Kindly, James.
Cool, thanks for the info and complimenting!