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Multi-Way Conventional loudspeakers with crossovers

[for the Aussies] Jaycar 2-Way DIY Floorstanding Tower Speakers - aka The 33s
[for the Aussies] Jaycar 2-Way DIY Floorstanding Tower Speakers - aka The 33s
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Old 21st June 2019, 12:15 PM   #1
RObErT RaTh is offline RObErT RaTh  Australia
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Arrow [for the Aussies] Jaycar 2-Way DIY Floorstanding Tower Speakers - aka The 33s

Hey fellow Aussies!

I haven't seen any recent posts here regarding use of the current (June 2019) range of Jaycar speaker components / drivers / woofers / tweeters so I thought I'd see if there was any interest out there still for people wanting to DIY build some speakers using this 'response' range of products?

I started an idea and build 2.5 years ago and after many changes (with large gaps in between) I finally have a recipe for a speaker I'm proud of and does what I intended it to do!

Short version: ~50L ported enclosure using Jaycar CT2007 1" Tweeter and Jaycar CW2194 6.5" Woofer, tuned to F3 of 33Hz. Designed for enjoying both Movies AND Music without the requirement of a subwoofer.

YES, I do have a sub and love my bass but I also have a 2.5 yr old toddler so I still wanted speakers I could enjoy while he sleeps. These speakers walk the line between not enough and too much low end so you can use them as-is and still enjoy but the sub is always there if need be. Are they reference monitor flat response? No, and they were never meant to be. Are they fun and enjoyable to use for movies and music? Absolutely!

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

I haven't arranged anything yet (I can if need) but I thought I'd gauge some interest if there was anyone out there looking to build something like this and if they were keen on some plans/designs so they'd have the info they need to build their own?

If you've built something similar then please share as I'd love to see your creations from also using the Jaycar drivers
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Old 1st July 2019, 09:04 PM   #2
zorz is offline zorz  United States
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Nice build!
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Old 1st July 2019, 10:55 PM   #3
Moondog55 is offline Moondog55  Australia
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Pete gifted me a couple of the 200mm but they are still sitting there; waiting on me to finish the house renovations
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Old 13th July 2019, 07:32 AM   #4
RObErT RaTh is offline RObErT RaTh  Australia
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Zorz, cheers mate

Moondog55, surely the house can wait a little longer right? You need something to listen to while you work on the renos :P

Also, I've finally completed these by stealing some pre-made grilles from some old dicksmith (DSE) tower speakers, shown above with silver drivers, and nerve-rackingly drilling holes and installing cups to mount them. Photo isn't too great but they came up looking a treat! Almost can't tell they were DIY now

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Old 14th July 2019, 08:35 AM   #5
D1GGY is offline D1GGY  New Zealand
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i would be interested in a few more details if you can, looks nice.

Cheers,
M

Last edited by D1GGY; 14th July 2019 at 08:39 AM.
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Old 14th July 2019, 09:33 AM   #6
avtech23 is offline avtech23  Australia
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[for the Aussies] Jaycar 2-Way DIY Floorstanding Tower Speakers - aka The 33s
Same, looks good
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Old 15th July 2019, 12:17 PM   #7
RObErT RaTh is offline RObErT RaTh  Australia
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D1GGY, avtech23, let me know if you need more to get started

BASIC SPECS: (mostly Jaycar parts)

50L enclosure with single 58x120mm bass port, CX2688
Crossover: Tweeter 2nd order with l-pad 'REVERSE POLARITY', woofer 1st order
CT2007 (tweeter)
CW2194 (woofer)
Capacitors, 15uF 100V Electrolytic Crossover Capacitor
Resistors, all 10 watt wirewound
Inductors (not from Jaycar), 0.39mH 21AWG and 3.0mH 20AWG

The l-pad looks weird because I actually had these speakers working with a different tweeter for quite some time after originally failing to get the Jaycar tweeters working how I wanted. Unfortunately the other tweeter went EOL so to be able to quickly and easily change between tweeters I made it so I could alligator clip resistors on the l-pad in parallel to get the desired result without re-soldering the crossover. Makes for quick changeover.

Click the image to open in full size.

Last edited by RObErT RaTh; 15th July 2019 at 12:29 PM.
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Old 20th July 2019, 10:11 AM   #8
D1GGY is offline D1GGY  New Zealand
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Thank-you, appreciate the details. Off to Jaycar tomorrow to pick up the drivers.
Cheers,
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Old 5th August 2019, 01:33 PM   #9
RObErT RaTh is offline RObErT RaTh  Australia
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Quote:
Originally Posted by D1GGY View Post
Thank-you, appreciate the details. Off to Jaycar tomorrow to pick up the drivers.
Cheers,
Great stuff mate!

Keep me posted on the build, I'd be keen to see how they progress
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Old 25th May 2020, 02:03 PM   #10
Stanislav is offline Stanislav  Australia
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Quote:
Originally Posted by RObErT RaTh View Post

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Hi Robert,

I know it's an old thread but I just found it while looking for other things here.

Just a few comments:
- that resistor R6 - is that the DCR of the coil?
- if so replace the coil with a lower DCR one, like a cored one
- with this one you are losing approx. 1.5 dB of sensitivity
your woofer is 87 dB, less 1.5 = 85.5 dB, and that is before any BSC

- which brings the next suggestion - implement some BSC
- looking at your boxes their width is maybe 22 - 24 cm
- using this formula: 115 / 0.24 = 479 Hz
479 x 0.707 = 338 Hz, this is your BSC frequency
- put a parallel LR after your coil - L ~0.8 - 1.0 mH, R ~ 2 - 3 ohm
This will bring your woofer's level to roughly 84 dB.
So you'll have to reduce the tweeter's level accordingly.

That woofer also has a very peaky top end so put a Zobel across its terminal, it will tame it a bit and also flatten the impedance.

Finally the values in the tweeter section look a bit strange, as if you are cutting it at around 1.5 kHz. That will stress the tweeter badly.

Of course you may not read all this, but I thought it was worth pointing out.

Cheers
Stan
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