FST Midrange Driver in 800D

[nick.h]

Does the 803s/803d/802D/801D/800D all use the same crossover for the FST Midrange?

Or for the 802D and up having the Sphere the crossover frequencies are different?

[nick.h]

Well I have answered my own question, yes they do use the same frequency crossovers for the 803s to the 800d

[ChrisssB]

if this is the case, then 804S should be included

[chinets]

Yes, 804s should be included!! How about the 804N and 803N etc.. The Nautilus series do they include the same frequency crossovers ?? How about the Nautilus SNAIL???
New questions to ponder!!
Cheers

[Kal Rubinson]

Well I have answered my own question, yes they do use the same frequency crossovers for the 803s to the 800d

Not according to the B&W 800 Series book I am looking at. The following all have crossovers at 350Hz and 4KHz: 804S, 803D, 802D, 801D, 800D. The odd man out, unless it is a typo, is the 803S which has 250Hz and 4KHz. I am betting it is a typo.

Kal

[Karma]

HI Kal,
For the 805S, yes it is a typo. That speaker only has one crossover frequency and it is 4kHz.

Sparky

[Kal Rubinson]

HI Kal,
For the 805S, yes it is a typo. That speaker only has one crossover frequency and it is 4kHz.
Sparky

I was excepting the 803S, not the 805S.

Kal

[RebelMan]

Not according to the B&W 800 Series book I am looking at. The following all have crossovers at 350Hz and 4KHz: 804S, 803D, 802D, 801D, 800D. The odd man out, unless it is a typo, is the 803S which has 250Hz and 4KHz. I am betting it is a typo.

Kal

There are a few specification typos in that book. The most acurate information can be found on their website, which shows the 803S with the correct 350Hz and 4KHz crossover points.

[joetama]

The 703 is also at the 350Hz and 4KHz...

[chinets]

Joetama,
What!!! The 703 has the 350Hz and 4KHz, but not the 800 Nautilus series or the Nautilus snail??? I can't believe it??
Can you explain?
Chinets

[james_dmi]

It should be noted that although the 703 has the same crossover frequencies that response slopes of the drivers will be different. The 800 range all use lower order crossovers then the other ranges and then the previous 800 range which will give them shallower response curves.

"The Nautilus" (Snail) will be completely different firstly its a four way design so it will have 3 crossover frequencies and secondly it uses a line level active crossover between the pre-amp and power amps which has phase compensation and far more complex circuits to very aggressively control the response curves.

[ChrisssB]

hmmm I wonder ......
same crossover frequencies......
Does this mean that someone could replace tweeters lets say on his 804S with diamond ones and make them 804D's .......?????
some1 should e-mail that question to B&W ....
I won't! they might send me a shrink :lol:

[chinets]

Yeah, but are the crossovers of the 804N equal to the 804s or the 803N,803s and 803D???
Inquiry minds want to know?
Cheers,
Chinets

[Kal Rubinson]

When I asked about the differences among the 800 series in terms of capacitors, I was told that the quality was identical but the values were not. That, I suspect, means that drivers are 'probably' not swappable.

Kal

[joetama]

I would agree with Kal that the drivers would not be “swappable”. There are many more factors to consider in changing out a driver than "crossover" points. The impedance and phase of the driver could have extreme differences especially since the tweeter material is so much different.

The Snail cabinet has very different driver configuration so the crossover points would have to be different to make a smooth transition between the drivers.

I would say like said above that with the “N” -> “S” or “D” the quality is the same but the quantity is not. The drivers are a little different as is the enclosure which changes how the drivers respond and I am pretty sure the crossovers are custom tailored per design so there would have to be a difference to make the frequency transitions and phase compensations work properly.

[chinets]

Thanks Joetama for your detailed explanation. Hmmmm Very Interesting!!!
Good Insight here!
Cheers