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Multi-Way Conventional loudspeakers with crossovers

Drop In replacement for seas woofer
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Old 12th January 2020, 08:19 PM   #11
vassilis1984 is offline vassilis1984
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Thanks everybody for your time!
I tried the p21rex without changing anything and I liked the sound a lot. It seems it is crossed at a low frequency point so no cone break up and nothing annoying. The p21rex drivers have more bass than the p21rf, so it sounds better to me. I tried to draw the crossover schematic but the coils didn't have any number on them. So I cannot tell how many mh they are.
Ι uploaded a picture of the cross just for reference.
On the right is the midbass section
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File Type: jpg IMG_20191113_191754.jpg (345.2 KB, 72 views)
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Old 13th January 2020, 06:38 AM   #12
system7 is online now system7  United Kingdom
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Quote:
Originally Posted by vassilis1984 View Post
I am a noob at crossover designs, and I've never seen a design like this. This is the Tweeter crossover design. Too many resistors...
Six resistors 10w 10.7ohm
Only a small image here, since your original is unnecessarily huge!

Click the image to open in full size.

Hmm, I only see three ceramic resistors. You'd think the bass section is on the left and is a bass bafflestep coil, with a shunt of ceramic 5.35 ohm (parallel 10W types) and a biggish capacitance consisting of three MKP capacitors.

The tweeter section, on the right, is a bit peculiar. Two coils, three varied capacitors and a level-adjusting resistor. I can't quite make sense of that. Something quite sophisticated conceivably:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

The yellow 0.82uF capacitor could only have a use as a bit of very high frequency rolloff on the tweeter. Usually with about 7.5 ohms, aka a Zobel.

But overall, looks like the bass section is quite simple, and hence forgiving of precise details. IMO, 8" woofers are fairly interchangeable! The reason I often mark the input resistor on the tweeter section in red, is it is adjustable to taste.
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Old 13th January 2020, 08:35 AM   #13
vassilis1984 is offline vassilis1984
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Steve, sorry for the huge picture!
I woke up early this morning and I took another look at the crossover. Both of those boards are for the midbass section. I followed the cables and found another board for the Tweeter!. I felt like a completely fool!
At the midbass section the left board has six resistors and three mkt caps 8.2uf each and the coil. At the right board there is the large coil, a 6.8uf mkt cap, the 0.82uf cap, an orange cap and a resistor!.

At the Tweeter board a murdof 6.8uf and a mkt 2.2uf
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File Type: jpg Screenshot_20200113_103102_com.huawei.himovie.overseas.jpg (857.2 KB, 4 views)
File Type: jpeg received_786510988494220.jpeg (47.7 KB, 12 views)

Last edited by vassilis1984; 13th January 2020 at 08:40 AM.
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Old 14th January 2020, 04:31 AM   #14
system7 is online now system7  United Kingdom
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vassilis1984,

a pleasure talking to you.

I think most people here just love music. Which has led us to explore good sound at home. I know I have. Maybe even learned to DANCE like Zorba.

I thought we were adjusting a two-way here:

Click the image to open in full size.

This sort of thing:

Click the image to open in full size.

Click the image to open in full size.

But I am starting to think you have a three way like my 45 year old Celestion Ditton 44:

Click the image to open in full size.

These use a more complex filter:

Click the image to open in full size.

This sort of thing:

Click the image to open in full size.

SEAS-3-Way-Classic

If you want to try speaker simulation, this one is useful:

Software | Visaton

Some simple projects you can put in the projekte folder and explore:

2 Wege – Boxsim Projektdatenbank

A huge archive of good designs here too:

Crossover Design Archives - Madisound Speaker PDF Library

Welcome to the hobby! Where there is a symmetry, there is a conservation law. In our case it tends to be (but not always) frequency response that is conserved.

Emmy Noether proved that!

Clever stuff. Noether's Theorem is also the basis of Quantum Field Theory.
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Last edited by system7; 14th January 2020 at 04:48 AM.
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Old 14th January 2020, 07:38 AM   #15
vassilis1984 is offline vassilis1984
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It is a two way speaker!.

An Greek brand named audio spectrum and the model is s37 (37 stands for the liters of the cabin.)



The left board, as you can see at the picture has only one input. The red/black wires are getting in the board but I don't see red/black wire to getting out. I don't know what kind of sorcery this is.

The little board I discovered yesterday is for sure the Tweeter crossover. The other two are the midbass section.

I uploaded also a picture of the speakers. 8inch 2-way!.
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File Type: jpg IMG_20191113_191754.jpg (345.2 KB, 9 views)
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Old 14th January 2020, 05:17 PM   #16
system7 is online now system7  United Kingdom
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I see no alternative to tracing what is connected to what, if it interests you.

I dug into this Wharfedale Shelton XP2:

Click the image to open in full size.

Click the image to open in full size.

I got quite a headache:

Click the image to open in full size.

Came out to this, which I simmed out of interest:

Click the image to open in full size.

Click the image to open in full size.
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