Breathtaking DIY Loudspeaker design under $500??

If you think you can make an H baffle and have an Alpha 15 for a reasonable price - then it should work well. With OB, the response needs EQ’ing so you might be best off with a miniDSP and two sets of Class D amps. A basic 2.1 amp isn’t going to give the optimal open baffle woofer response. They need a 6dB/octave boost below their OB falloff frequency to sound good. Open baffle os complicated and inefficient despite the cabinet being so simple. A basic sealed box or reflex box will have flatter response and deeper reach. But you did remind me that you want a super system, not pedestrian.

Good luck with whichever way you choose.
 
That looks perfect! Even has high quality banana style binding posts rather than cheap wire spring clips. Looks good!

These are the specs:

Specifications:
Power Output: Built-in 75W amplifier.
Impedance: 8ohm, 0.1% THD at 100Hz.
Driver: 10 Jumbo woofer driver.
Freq. Response: Freq. Response : 28Hz - 180 Hz.
Casing: Wooden Cabinet.
S/N ratio at full rated power 99db (SN:SW-100) (177405-108)

I've put in a bid.

thanks
 
There are lots of second hand speakers for sale in Australia.
I bought a pair of Yamaha horn speakers for $A300 in West Australia; I saw similar for much less in the Eastern States.. The boxes are excellent,,very sensitive, Great dynamics, you could use a 5 watt amp. As with all second hand speakers you need to make sure they work.
 
Cliff,
I don't know where in Oz you are, but I think you can buildnice quality active three ways for under $1,000AUD.
If in Melbourne, I can show you mine.

Thanks T.

At the moment I'm pretty advanced on building a pair of Karlsonators.

Already have the drivers and Sub.

I'll be accumulating timber from salvage, so apart from wiring, binding posts and sundry, my outlay will be $220 all up.

After that, I'll look towards something with more substance like your set up, although I'm keen to explore simplicity.
My speaker guy recommends a quality pair of single full range drivers with horn loaded cabinet design to avoid phase issues, XO's and the like.

That's why I was interested in the Alfredo.

cheers

C
 
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That looks perfect! Even has high quality banana style binding posts rather than cheap wire spring clips. Looks good!

I picked up the Sansui Sub for US$84.

First time Sub user.

Do I run the speaker cables from the Amp to the Sub High Level In posts, and then from Sub High Level Out posts to the Karlsonators?

The powered Sansui Sub looks like it has a healthy onboard power supply.
 

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That’s a great deal. Did you make sure it works before buying?

Yes. Connect your amp’s output to the “Input” and your speakers to the “Output” on the sub. They are just pass throughs with a high impedance tap for the sub’s amp.

Here are plans by TB46 (haven’t heard from him in a long time - anyone know where he is?):
https://www.diyaudio.com/forums/att...l-tc9fds-karlsonator_-53x_dual_vifa_tc9fd-pdf

The plans by Jhofland are in Sketchup and require you to know how to print 2D plans from a 3d model. Not that hard but takes knowing how.
https://www.diyaudio.com/forums/att...r-0-53x-dual-tc9fds-karlsonator53_2014ver-zip
 
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That’s a great deal. Did you make sure it works before buying?

Yes. Connect your amp’s output to the “Input” and your speakers to the “Output” on the sub. They are just pass throughs with a high impedance tap for the sub’s amp.

Thanks.

We tested them while I was there.

Played them while varying the crossover value as well as the volume.

No cabinet vibration and sounded pretty capable.

The unit is very heavy and would have been expensive to ship, I was fortunate with a pick up 20 minutes away.

Will look for deals on the Dayton Amp & SMSL Sanskrit 10th High-end DAC.
 
That’s a great deal. Did you make sure it works before buying?

Yes. Connect your amp’s output to the “Input” and your speakers to the “Output” on the sub. They are just pass throughs with a high impedance tap for the sub’s amp.

Here are plans by TB46 (haven’t heard from him in a long time - anyone know where he is?):
https://www.diyaudio.com/forums/att...l-tc9fds-karlsonator_-53x_dual_vifa_tc9fd-pdf

The plans by Jhofland are in Sketchup and require you to know how to print 2D plans from a 3d model. Not that hard but takes knowing how.
https://www.diyaudio.com/forums/att...r-0-53x-dual-tc9fds-karlsonator53_2014ver-zip

Thanks.

The first file (pdf) is for foam.

The second file opens up at "notepad" and instead of displaying the plans, thousands of chinese characters appear?
 
Hi X.

What are your thoughts?

Instead of the Dayton DTA-120BT Amp & SMSL Sanskrit 10th High-end DAC, would it be better to go for the newer SMSL SA300 High Power Bluetooth 5.0 HiFi Remote Digital Amplifier at around US$139?

It includes an SMSL Dac onboard, at 2.1 can handle a Subwoofer, produces 40wpc at 8 ohms and features a newer chip, and with a 162 watt external power supply.

https://www.amazon.com/S-M-S-L-Infineons-technology-amplifier-chip,Bluetooth/dp/B081DJHSG4

Toid's DIY Audioby 123ToidThe Best Amplifier Under $150? SMSL SA300
 
That’s a nice amp and DAC combo. It uses a lot of state of the art stuff in a single package.

Only a couple of things that may or may not be an issue for you:

Only has USB for digital in from computer, whereas the Sanskrit provides Toslink optical and SPDIF coaxial digital input. If you ever want to have your newer TVs or cable boxes/game consoles with only optical output to drive your sound system, then it’s not going to do that.

The DAC on the Sanskrit is higher end IMO, I like the sound quality of the AK4490 vs the ESS based DACs. Basically, more features on the DAC side.

The amplifier has a new Infineon chip that I have not personally listened to. I think it will probably be fine. Most new Class D amps sound very good. I like the specs with 40uV noise and low 0.004% THD at higher powers.

MA12070 - Infineon Technologies

With that said, the SMSL looks very very attractive - super with integrated remote that controls all aspects including basic EQ and permits RCA inputs. I might have to get one myself for use in the bedroom. The review seems positive.

I would say that if you don’t need the advanced DAC functions (DSD, high bit rates, etc) or optical input, go for it! It looks like a slick package. It is amazing what you can get for $130 nowadays. Quite astounding actually.
 
Get a 3.5mm stereo jack and connect the L, R, common to the 3 pins. The pins are TRS (tip, ring sleeve). Remember ring is Right and tip left, sleeve is common. Use continuity checker when in doubt. Add a 19v laptop brick for power. Make sure polarity is observed. Speaker outputs are self explanatory. Cannot use use common on speaker outs as this is a bridge tied load. Both wires are live.