Ruark Equinox Driver Quest part 2

[Fefeld]

Hello there,

I'm reopening an old thread:

Ruark Equinox Driver Quest

I've replaced both the tweeter and the woofer in my Ruark Equinox.

I'm now using:

Scan-Speak D2905/970000 'Classic'

SEAS E0042-08S (W18NX001) 'Excel'

They were the closest matches to the originals.

However, the W18NX001 drivers suggested in that thread are 8-ohm drivers, while the originals were 6 ohms.
I'd need to redesign the crossover to compensate the difference...
I will share the current design and would appreciate your input.
Also if anyone else has done this change on the equinox please share your experience

Thanks

 

[Fefeld]

here the original crossover design : (I still need to measure the inductors to know their values...)
Then, I will see if I need to do something as I'm changing the tweeter and drivers to :
Scan-Speak D2905/970000 'Classic'. 6Ω
SEAS E0042-08S (W18NX001) 'Excel' 8Ω

Suggestion would be welcome.

 

[Fefeld]

the inductors are 1mH and 450uH

 

[Fefeld]

here the frequency graph :

 

[Fefeld]

if I short r3, it improves a little bit:

 

[Fefeld]

but ideally, I would like to shift the Xover point to 3Khz..
I someone has any suggestions... without changing the impedance.. I would like to keep them for now, I'm fine to chnage the resistance and capacitors.

here are the XSim , FRD and ZMA files.

 

[Fefeld]

so I finally decided to:
1 .Remove the R3 resistor,
2. Replace the 1mH inductor (low pass) with a 560µH inductor.
I’ll run some tests over the next two weeks and keep you updated. If it works, I’ll likely invest in high-quality components for the crossover.

 

[jimk04]

Have you tried it with one of the drivers reversed polarity? 2nd order symmetrical crossover usual yields an out of phase sum.
Also it looks like they might be fit from some BSC to boost the bass .

 

[temp25]

Try the woofer filter from this design as a starting point. That woofer is going to need a notch, and a larger coil.

Also, it helps very much to see the filtered driver responses. That is more revealing than showing the sum.
https://www.madisound.com/library/stacks/W18NX001_T25CF001.pdf

 

[Fefeld]

Have you tried it with one of the drivers reversed polarity? 2nd order symmetrical crossover usual yields an out of phase sum.
Also it looks like they might be fit from some BSC to boost the bass .

yes you are right: looks better, obviously this is only simulation so I will need to try...

 

[Fefeld]

Try the woofer filter from this design as a starting point. That woofer is going to need a notch, and a larger coil.

Also, it helps very much to see the filtered driver responses. That is more revealing than showing the sum.
https://www.madisound.com/library/stacks/W18NX001_T25CF001.pdf

Yes, I saw that design... I see how it looks in XSim.. Keep you posted. Also I wanted to stay closed to the original RUARK design.

Thanks to both of you.

 

[temp25]

So..... , what is the original Ruark design?

 

[jimk04]

See post #3

 

[temp25]

That's the x-over filter. What is the "design" that he wants to stay close too?

 

[Fefeld]

Sorry for the confusion. What I meant was to stick close to the original crossover, so I could make incremental changes and hear the differences.
But you are right, I should also consider other crossovers — we’re not talking about tons of components here.
I'm all new in this field, so I have quite to learn.

Indeed the word Design was wrong.

One element of the RUARK design (this time the speaker design, not the X-over design) is that the the crossover network is housed inside the heavy stand rather than the cabinet. the connection from the stand to the speaker is a speakon . the vibration inside the cabinet have no impact on the X-over.
For the rest, those speakers look good.

I'll be away for a week or so. More to follow in a week or two.

 

[temp25]

Take a look at your woofers raw measurements. There's a peak at high frequencies. That peak may not have been present with the original woofer. Part of the x-overs job is to correct things like that. You can sim a notch, and add it to your x-over. That should produce a substantial quality improvement.

 

[Fefeld]

I need to review my speaker raw measurement, you are 100% right. I've already noticed that the tweeter ima file was incorrect.... here the new one.

Now taking this in consideration and inverting the tweeter, I get already decent values with the original Xcross over. I need to look cat how it is wired, I have probably didn't wired it how it was originally.
Anyway, I will be only able to play with the speaker in 2 weeks.