@Petross. Always nice when people get back with the result on a project. Not many do! So thank you.
Here is a summary of Rutcho's popular modification to a two-way B&W 601-S3:
https://rutcho.com/tweaks/01_bw_dm601s3/bw_dm601s3.html
Before:
After:
Now, that all looks like harmless fun in the tweak department, and worth a try!
HOWEVER.... when you try this with other 6" Kevlar 601 and vaguely similar 7" Kevlar 602 models, it needs a bit of thought.
Crossovers are different, and drivers are updated or modified. And the impedance problem with the 4 ohm tweeter limits what you can do.
But this all looks OK if this is your original 601-S2, and I don't know where you dug it up from:
Going to this:
I just have a doubt that the tweeter coil really is 0.08mH in your 601-S2. Needs measurement IMO.
Otherwise internet confusion will get worse! 🙁
Best, Steve.
Here is a summary of Rutcho's popular modification to a two-way B&W 601-S3:
https://rutcho.com/tweaks/01_bw_dm601s3/bw_dm601s3.html
Before:
After:
Now, that all looks like harmless fun in the tweak department, and worth a try!
HOWEVER.... when you try this with other 6" Kevlar 601 and vaguely similar 7" Kevlar 602 models, it needs a bit of thought.
Crossovers are different, and drivers are updated or modified. And the impedance problem with the 4 ohm tweeter limits what you can do.
But this all looks OK if this is your original 601-S2, and I don't know where you dug it up from:
Going to this:
I just have a doubt that the tweeter coil really is 0.08mH in your 601-S2. Needs measurement IMO.
Otherwise internet confusion will get worse! 🙁
Best, Steve.
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This is my experience and I am satified. If someone wants to try on their own responsibility, they are free to do so.
Hi Steve
I see many posts around these speakers and 601 and various versions, but they always get hijacked by different model questions so very hard to deduce the solution options for DM602 S3 in particular.
Do you by any chance have the project files for DM602 S3 as pictured here? I am looking to perform the upgrade but would like to simulate changes to my preference.
Thank you
Hello All,
Can I change the subject on Crossover upgrade Focal Electra 906 or is necessary to open a new topic ?
I would be grateful if someone would post the original schematic because I couldn't find it. Does anyone modified original crossover for smooth response on bass?
I removed the midass from the speaker and I could barely see the components mentioned below, I don't have a photo of the back of the filter.
What I know is that the filter contains a large air coil, a smaller air coil, an iron core coil, 4.7 ohm /7 W 10% resistor, 10 ohm /10 W 10% resistor, 15 uF 63 Volt 10% bipolar capacitor, 12 uF capacitor, and between the two 4.7 uF capacitors is a 3.9 uF one. Midbass Focal 6W4351 and tweeter TC90TD5B titaniumdioxide.
I only have the parameters for the midbass in the attached photo.
Thank you.
Can I change the subject on Crossover upgrade Focal Electra 906 or is necessary to open a new topic ?
I would be grateful if someone would post the original schematic because I couldn't find it. Does anyone modified original crossover for smooth response on bass?
I removed the midass from the speaker and I could barely see the components mentioned below, I don't have a photo of the back of the filter.
What I know is that the filter contains a large air coil, a smaller air coil, an iron core coil, 4.7 ohm /7 W 10% resistor, 10 ohm /10 W 10% resistor, 15 uF 63 Volt 10% bipolar capacitor, 12 uF capacitor, and between the two 4.7 uF capacitors is a 3.9 uF one. Midbass Focal 6W4351 and tweeter TC90TD5B titaniumdioxide.
I only have the parameters for the midbass in the attached photo.
Thank you.
Attachments
I don't know the crossover but if you can pull it for a front and back photo, we might trace it and simulate it.
There are other methods you could use. For example, measure the system response and EQ the bass response as needed. Perhaps it's your room in any case which means that would be the correct way of approaching it. Not that it should make a difference, you can do it that way but do you really want to change the crossover for a problem that isn't with the speaker?
Alternatively you could measure the drive signal to each driver, however it's difficult to say what you would do with it until it's known why you'd have to resort to it.
There are other methods you could use. For example, measure the system response and EQ the bass response as needed. Perhaps it's your room in any case which means that would be the correct way of approaching it. Not that it should make a difference, you can do it that way but do you really want to change the crossover for a problem that isn't with the speaker?
Alternatively you could measure the drive signal to each driver, however it's difficult to say what you would do with it until it's known why you'd have to resort to it.
Petross has provided this image so I've cross referenced the front and back so it can be traced.
It's a difference beetwen 10 J and 10 uF, because Focal work with Joules on cappacitors. You know kind of calculation, or îs the same?
You've made a mistake in your writing.
A "dead short at high frequency with a shunt capacitor across the bass" is what would occur if you omitted the resistor AND inductor
using a parallel Zobel R/C network.
However, the circuit shown uses only series components with the woofer, so such a statement is not correct.
PS.
A .068uF cap in series with a 22ohm resistor across a 1.5mH inductor is a very subtle and nearly meaningless adjustment.
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Not bad if you want to deal with breakup though. It's a resonant circuit so it could pull the response right down.. dependent on damping, of course.
I think I was sort-of saying that to address breakup & nasty woofer HF, Zobel networks are a HIGHLY EFFECTIVE integral component.
( I would always choose them over anything that is even slightly resonant > including a suppressed null )
PS.
YES, the inductance of a voice coil and R/C is a form of resonant circuit.
( I would always choose them over anything that is even slightly resonant > including a suppressed null )
PS.
YES, the inductance of a voice coil and R/C is a form of resonant circuit.
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I'd consider the impedance compensation too and sometimes I might even use it.. but you know, a little RC plus some L in the driver impedance... No, the resonant circuit will work as expected.. but there is an interesting difference.
Joe Rasmussen's Elsinore speakers use just this kind of circuit for the tweeter. It looks like first order but cuts like sixth order and has phase like third or fourth. These are sleeper circuits in that regard. Not the only way to do it, but they can save on parts and are adjustable.
Joe Rasmussen's Elsinore speakers use just this kind of circuit for the tweeter. It looks like first order but cuts like sixth order and has phase like third or fourth. These are sleeper circuits in that regard. Not the only way to do it, but they can save on parts and are adjustable.
