More SBL - Setup/ Bases (Question for Tom A)
Posted by: greeny on 29 May 2003
Sorry to start yet another topic on this subject but I didn't want to hijack the SBL vs SL2 thread.
A question for Tom Alves really. What size are the MDf bases you have under your SBL's. And how do you orientate your 3 screws in the floor (2 at back, 1 at front?)
The reason I ask is as follows:
Ever since I have rearranged my SBL's to fire down the room rather than accross I've had a Bass boom problem. Much of this has been addressed with changes to Furniture positioning, strategic cushion positioning etc and now it is only evidennt on maybe 5 - 10% of recordings. Please note this is not a huge problem, but I much prefer a lean fast bass to a thick/heavy bass.
I had been addressing the problem as a room mode issue (which it may be) but on reading a different thread about using paving slabs under SBL's I decided to give it a try.
I purchased 4 * paving slabs from B&Q and under the SBL's they went. They had previously been located on 4 cross head screws through the carpet and underlay into the Chipboard floor. I separated the paving slabs by 4 blobs of blue tack, the bottom slab laying directly on the carpet. Well the transformation was pretty significant, any hint of boom was gone to replaced by tight, fast, spacious bass, still deep but with more detail. Great I thought, jobs a good un, but... 1 day later and much of the improvement has gone, still slightly better than before but not the leap that I had experianced the day before. So what might have happened;
- Slabs have settled into the carpet/underlay and are now more coupled to the floor? - maybe
- Blue tack has compressed to such an extent that slabs are more coupled and this is adversley affecting things? - maybe
- I imagined it all? - I don't think so.
- The mains was just particularly good when I first did the experiment? - Maybe but I remain convinced there is some good results to be acheived by experimenting in this area.
In order to try to address the Blue tack issue I replaced the blue tack with a thin cork dinner mat, but this has not improved matters.
So I thought I might play around with some Ball Bearings/nuts and screws, but on reading Toms comments maybe I sould try an MDF solution. One concern I have is that the rear spikes on my SBL's are only maybe 1.5 inchs from the wall (skirting board) so I assume any Base would need its floor interface nearer the wall than this (to be stable) This would put it into gripper rod territory. I was also interested in the stability of a three point solution, hence the question to Tom.
Anyway - sorry to waffle on and hope you understand the query.
A question for Tom Alves really. What size are the MDf bases you have under your SBL's. And how do you orientate your 3 screws in the floor (2 at back, 1 at front?)
The reason I ask is as follows:
Ever since I have rearranged my SBL's to fire down the room rather than accross I've had a Bass boom problem. Much of this has been addressed with changes to Furniture positioning, strategic cushion positioning etc and now it is only evidennt on maybe 5 - 10% of recordings. Please note this is not a huge problem, but I much prefer a lean fast bass to a thick/heavy bass.
I had been addressing the problem as a room mode issue (which it may be) but on reading a different thread about using paving slabs under SBL's I decided to give it a try.
I purchased 4 * paving slabs from B&Q and under the SBL's they went. They had previously been located on 4 cross head screws through the carpet and underlay into the Chipboard floor. I separated the paving slabs by 4 blobs of blue tack, the bottom slab laying directly on the carpet. Well the transformation was pretty significant, any hint of boom was gone to replaced by tight, fast, spacious bass, still deep but with more detail. Great I thought, jobs a good un, but... 1 day later and much of the improvement has gone, still slightly better than before but not the leap that I had experianced the day before. So what might have happened;
- Slabs have settled into the carpet/underlay and are now more coupled to the floor? - maybe
- Blue tack has compressed to such an extent that slabs are more coupled and this is adversley affecting things? - maybe
- I imagined it all? - I don't think so.
- The mains was just particularly good when I first did the experiment? - Maybe but I remain convinced there is some good results to be acheived by experimenting in this area.
In order to try to address the Blue tack issue I replaced the blue tack with a thin cork dinner mat, but this has not improved matters.
So I thought I might play around with some Ball Bearings/nuts and screws, but on reading Toms comments maybe I sould try an MDF solution. One concern I have is that the rear spikes on my SBL's are only maybe 1.5 inchs from the wall (skirting board) so I assume any Base would need its floor interface nearer the wall than this (to be stable) This would put it into gripper rod territory. I was also interested in the stability of a three point solution, hence the question to Tom.
Anyway - sorry to waffle on and hope you understand the query.
Tom !
Do you have some picture of that?
I plan to do something like that for my Intros.
Thanks,
Ozren
Do you have some picture of that?
I plan to do something like that for my Intros.
Thanks,
Ozren
On a simple and purely Engineering principle
Three Point Location is always more stable
that any other number ,but if fiddling with
your balls keeps you happy, who am I to
question what you do behind closed doors
Oldie
Three Point Location is always more stable
that any other number ,but if fiddling with
your balls keeps you happy, who am I to
question what you do behind closed doors
Oldie
Mick,
OK, I wouldn't take your judgement for it (what with Sarah), but I'll take Vuk's.
Thomas
OK, I wouldn't take your judgement for it (what with Sarah), but I'll take Vuk's.
Thomas