AsciLab F6B Bookshelf Speaker Review

[Gremlins]

Sorry to be a prick, but i see différent cabinets than the ones sold on audiophonics

 

[MarkS]

‘Given’ I wish, I sadly have never been given anything by anyone but the stands are properly engineered and I wanted to see if they made any difference under the Mesanovic RTM10s we had at the time.

And did they?

 

[amirm]

Are these the same cabinets as on audiophonics with rounded edges?

That is just the lighting and resolution of the picture. All are the same with rounded corners.

 

[Purité Audio]

And did they?

No.
Speakers should be designed so that they do not store energy that could lead to audible resonance, but properly engineered products in the first instance.
Keith

 

[Lars Risbo]

In theory higher sensitivity speakers produce less distortion and suffer less compression for a given SPL.

that is not generally true. depends on the construction. In many cases, sensitivity can be traded for lower distortion, eg linearising Bl(x) comes at a loss of peak Bl etc

 

[Matt_Holland]

that is not generally true. depends on the construction. In many cases, sensitivity can be traded for lower distortion, eg linearising Bl(x) comes at a loss of peak Bl etc

Fair comment. To clarify my overly simplified post, it was based on the proviso that higher sensitivity arises from the use of more drivers compared to a lower sensitivity speaker, e.g. 3-way versus 2-way, where it is often the case that additional dedicated bass drivers of the 3-way reduce distortion at low frequencies, as well as allowing the mid driver to require less baffle step loss equalisation, therefore increasing overall sensitivity.

 

[AsciLab]

Fair comment. To clarify my overly simplified post, it was based on the proviso that higher sensitivity arises from the use of more drivers compared to a lower sensitivity speaker, e.g. 3-way versus 2-way, where it is often the case that additional dedicated bass drivers of the 3-way reduce distortion at low frequencies, as well as allowing the mid driver to require less baffle step loss equalisation, therefore increasing overall sensitivity.

That can’t be a fair comparing. To be fair it should be compared as driver itself in same size and same DCR.

 

[Matt_Holland]

That can’t be a fair comparing. To be fair it should be compared as driver itself in same size and same DCR.

But for your fair comparison you will sacrifice bandwidth to achieve higher sensitivity.

Anyway I take your point. I’m talking about typical product choice comparisons. Within a manufacturer’s range as we increase cabinet size and driver quantity we usually gain sensitivity and reduced distortion.

 

[sceptical1]

If the two drivers are physically aligned and there is an LR4 crossover why is the step response not perfect?

 

[AudioJester]

Sorry to be a prick, but i see différent cabinets than the ones sold on audiophonics

Do you see dead people as well? (Poor attempt at humor)

They clearly have rounded corners. Is that a purchasing decision for you?

 

[AsciLab]

Are these the same as on audiophonics with rounded edges?

Some of previous version models were sold in Korea as edged corner shape. All global selling speakers will be rounded.

 

[AsciLab]

If the two drivers are physically aligned and there is an LR4 crossover why is the step response not perfect?

Step response means phase. LR4 has phase delay. What you see is the phase delay. Step response can’t be a single triangle as passive speaker with proper crossover. It can be only achieved by FIR.

 

[Gremlins]

Some of previous version models were sold in Korea as edged corner shape. All global selling speakers will be rounded.

Ok got it thanks

 

[Thomas Savage]

Given’ I wish, I sadly have never been given anything by anyone

Iv got some fetching swimwear i could gift you , Amirm gave the little number to me years ago . After somewhat shamefully putting on a lot of fat recently I no longer look good in the outfit or if am being honest i cant even stretch it over my lardy frame ! The G-string slices me like im some pastrami at Katz's deli .

Just pm me address details !

 

[JohnnyNG]

The G-string slices me like im some pastrami at Katz's deli .

Next time I'm in Katz's I'll have that vision in my head.

 

[Lars Risbo]

If the two drivers are physically aligned and there is an LR4 crossover why is the step response not perfect?

physical alignment does not equal phase linear and LR4 sums into an all pass which is not phase linear, ie delays the bass but not the treble. then you have the bass response which is a minimum phase high pass which again is not phase linear. a phase linear high pass has pre ringing. now is that a perfect transient response ? all of this is generally misunderstood.

 

[bmc0]

If the two drivers are physically aligned and there is an LR4 crossover why is the step response not perfect?

This question has already been addressed, but I thought some plots might be helpful. Here's the summed magnitude and phase response of an ideal 1kHz LR4 crossover:

And the corresponding step response:

Add a 4th-order highpass to approximate the bass response plus a little high frequency shelving and we get this:

Which is fairly close to the measured step response.

 

[jEDGEc0m]

Such a compelling proposition, these speakers.
If valuing value for money, I'm finding it hard to figure a compelling case to get the C6B over the F6B. Measurements so similar... and will have eq/room correction anyway.
Thoughts?

High SPL unlikely to be required - for bedroom size, with sub(s).

I understand the cabinets are structurally identical..?

F6B has a higher minimum impedance, which seems like it might not be a bad thing, right? (Will power them each separately with a stereo Fosi v3, but just running one channel. 32v 5A)

F6B in cart... might sleep on it some more yet. If nothing else, the colour choice consideration. And I wonder how smashed with orders they are...

(These would displace a pair of JBL Studio 630 which have been modified to into bi-amp and active Xover and room correction. Ports plugged, with subs, XO 70hz. Very interested to hear if they will be dramatically different if result is otherwise a similar in-room frequency response).

 

[FERCSA]

Such a compelling proposition, these speakers.
If valuing value for money, I'm finding it hard to figure a compelling case to get the C6B over the F6B. Measurements so similar... and will have eq/room correction anyway.
Thoughts?

Distortion

 

[jEDGEc0m]

Distortion

Ah, good point. Not a huge difference though, right? Reckon if not really pushing the SPL limits anyway, this would be an inaudible non issue? Fair to say much of the music I listen to is sooo laden with saturation anyway!