AsciLab F6B Bookshelf Speaker Review

[tw 2022]

Tons of retailers in Germany have the DBR62 for like 350-400€ per pair.

It's been at that price for ages, so I'm not sure I would attribute high prices elsewhere directly to Elac.

They are $800 A pair currently in the US, I know that recent geopolitical events have caused some of this.. But they have been steadily going up for the last 2-3 yrs....along with that: they rarely go on sale anymore , the uni - fi .2's that were panned seem to be on sale more often than not these days, make of it what you will...

 

[Deleted member 88295]

I started really enjoying the speakers after I EQ'd bass for my room.

Then I started thinking why waste free energy so I removed the PR from one the speakers and added extra weight.

EQ flat, I compared the speaker to stock and the difference was way beyond my expectations. The extra weight made the speaker go deeper and removed the unwanted bass, it also sounded much bigger. I added the same weigth to the other PR and am very happy with how the c6b sound in my room.

Absolutely no need to mess with subwoofer(s) what I initially had planned.

 

[Purité Audio]

You removed the passive radiators and added weight to the top of the speakers?
Keith

 

[Deleted member 88295]

You removed the passive radiators and added weight to the top of the speakers?
Keith

There are 2 disks (10g and 5g) bolted (m6) to the PR, I added 10g.

 

[Purité Audio]

Can you post a photograph?
Keith

 

[staticV3]

FYI, this will shift the PR's resonant frequency down, extending LFX but leaving a hole in the response where woofer and PR cross over.

 

[Deleted member 88295]

Can you post a photograph?
Keith

No I am not opening it up again.

The PR is the 5×8″ SB15SFCR-00 / Paper

This picture should be pretty self explanatory

 

[ShadowBoxer]

PR manufacturer (SBA) description:
"Easily adjustable moving mass".

 

[jEDGEc0m]

There are 2 disks (10g and 5g) bolted (m6) to the PR, I added 10g.

Cool. Interesting. In room measurements would be cool and interesting to see.

FYI, this will shift the PR's resonant frequency down, extending LFX but leaving a hole in the response where woofer and PR cross over.

Since the room does such drastic things down in the low end, could it not be entirely plausible that their change ends up being flatter as well as lower extension?

 

[staticV3]

Since the room does such drastic things down in the low end, could it not be entirely plausible that their change ends up being flatter as well as lower extension?

Yes, it's possible that the added response dip just happens to counteract a room mode you have at your MLP.

It's equally possible that it makes an existing room mode even more pronounced.

And it's just as possible that there is no room mode there and you'll hear the dip as-is.

 

[jEDGEc0m]

Yes, it's possible that the added response dip just happens to counteract a room mode you have at your MLP.

It's equally possible that it makes an existing room mode even more pronounced.

Would be interesting to see measured response / change.

I guess it's proven that subjectively, they like it better (Even if it's technically worse

My room seems unlikely to behave well without other location/sources of bass, and I'd prefer not to ask speakers of this size to do full range. I think I listen about up to about 85Db A-weighted, at about 2m in a 3.5x3.5x2.4m room. Sometimes quieter, rarely louder for very long.

 

[staticV3]

I guess it's proven that subjectively, they like it better (Even if it's technically worse

Not until they've done blind tests.

Don't underestimate cognitive bias.

If people could fairly judge their own mods, then there wouldn't be thousands of them online, convinced that their random audio mods unlocked new fidelity heights.

 

[Deleted member 88295]

It's not really a mod, just EQ but by different means. I don't need blind tests to tell if the bass sounds different.

When you do normal EQ you "mod" too, even toeing in or out is modding. Think of it as what Kef offers with their reference series where the user can swap the bass port.

 

[Robbo99999]

It's not really a mod, just EQ but by different means. I don't need blind tests to tell if the bass sounds different.

When you do normal EQ you "mod" too, even toeing in or out is modding. Think of it as what Kef offers with their reference series where the user can swap the bass port.

It would have been interesting to have in room measurement comparisons of your mod though, that's a good way of being sure, especially if you have speakers and mic in exactly the same position & no other change to the room.

 

[Bucking]

How would these do on a Denon X3800H with a 5.4 setup?

 

[Deleted member 88295]

It would have been interesting to have in room measurement comparisons of your mod though, that's a good way of being sure, especially if you have speakers and mic in exactly the same position & no other change to the room.

I was planning on getting a mic to measure my room. It won't be before and after but still nice to see.

 

[Robbo99999]

I was planning on getting a mic to measure my room. It won't be before and after but still nice to see.

It'll be useful to help sort out the bass. But yeah, if it's not before & after the mod then I don't think you'll be able to make any accurate inferences on what the exact frequency response effect is of the mod.

 

[SorenTyson]

I was planning on getting a mic to measure my room. It won't be before and after but still nice to see.

Sorry, I don't get it. You buy a speaker with great measurements like this, confirmed with Klippel, and then change it randomly (meaning without measuring pre/post).

 

[MarkS]

Sorry, I don't get it.

Apparently not!

You buy a speaker with great measurements like this, confirmed with Klippel,

Those are anechoic measurements. @Raiju thought the sound in his room could be improved.

and then change it randomly (meaning without measuring pre/post).

The change was not random, it was a guess for a physical change that would modify the bass response. The pre/post evaluation was done by ear, the exact same method speaker designers used for many decades before easy cheap measurements became available.

Long ago I owned some VMPS speakers that had passive radiators with spirals of putty at their centers to add mass. Designer Brian Cheney encouraged owners to try adding or removing some of the putty to modify the bass response to better fit the owner's room and/or taste.

 

[Purité Audio]

Not something I would advise but if the process is reversible ( without damage to the speaker) I don’t see any harm.
Keith