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Multi-Way Conventional loudspeakers with crossovers

Portable Bluetooth Speaker Build With Passive Radiators Build
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Old 4th August 2018, 09:58 PM   #11
PedroDeMio is offline PedroDeMio  Brazil
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Board for one speaker done

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Old 4th August 2018, 10:10 PM   #12
Mayuri is offline Mayuri  Finland
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Very nice project. Looking forward on seeing how it turns out.
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Old 8th August 2018, 02:33 AM   #13
PedroDeMio is offline PedroDeMio  Brazil
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With help from you guys (Crossover Design - When to use driver offset? (Dz)) I've made a few modifications and optimization to improve the power response and also manage to remove one inductor while keeping the response as close as possible to a LR 4th order acoustic

Inductors are ordered, should be a few days to arrive since they are custom made. For capacitors and resistors I will see if I can source them locally

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Old 8th August 2018, 03:12 PM   #14
PedroDeMio is offline PedroDeMio  Brazil
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Laminating. First time doing this, glad we did the bottom first as already learned what to do and what not. My grandpa is helping in this part

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Old 8th August 2018, 05:06 PM   #15
Jonhny is offline Jonhny  Sweden
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Looks very good!
How much EQ are you going to add in the bass frequencies?
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Old 8th August 2018, 11:16 PM   #16
PedroDeMio is offline PedroDeMio  Brazil
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Quote:
Originally Posted by Jonhny View Post
Looks very good!
How much EQ are you going to add in the bass frequencies?
Expected is 10dB at 40Hz with a Q of 1,12 if I remember correctly, but that should be to achieve a perfectly flat response, letís hope that I can get a full sound with less because the more boost I add the less maximum output I can get before running into power and excursion limits

What would be great for this box is a multiband compressor, this way I can limit the bass without compromising the maximum output. Itís what almost all portable Bluetooth speakers do

Unfortunately the cheapest way Iíve found to that is using two Mini DSP 2x4 per speaker, and that still too expensive
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Old 9th August 2018, 10:08 AM   #17
Jonhny is offline Jonhny  Sweden
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I think 7-8dB will get you very far and allow enough SPL. Having the speaker reach down to 40Hz is in my mind very important. 50Hz makes it sound like a bluetooth-speaker. Is it possible that you can adjust the bass EQ depending on volume?
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Old 10th August 2018, 02:31 AM   #18
PedroDeMio is offline PedroDeMio  Brazil
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That's exactly what I wanted, you can easily do that with the multi-band compressor

Unfortunately I didn't find any stand alone board for that, only using multiple mini DSP's or integrated in pro amps like the iNUKE

If anyone know how to do that let me know.

Only on the finished box the max volume can be determined, the plan is to adjust the gain using lots of songs, mainly bass heavy ones so it never runs into clipping no matter what is fed

Also finished gluing the wood, after sanding the corners it looks amazing, honestly I didn't thought it would end up this good

Now only need to sand a little more and apply varnish

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Old 10th August 2018, 09:44 PM   #19
PedroDeMio is offline PedroDeMio  Brazil
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It works!!!

At first I tough the filter wasn't working, but the trimpot is a 30 turn one and I had only turned 5 or so

The amp needs more voltage as it is distorting a bit, not sure exactly what I will do, for the stationary one is easy, will order a 28V power supply and should be good

the tweeter is not wired yet

The audio recording quality is not great, when the crossover is ready I will use the UMIK

YouTube

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Old 11th August 2018, 07:21 PM   #20
tmuikku is online now tmuikku  Finland
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Quote:
Originally Posted by PedroDeMio View Post
That's exactly what I wanted, you can easily do that with the multi-band compressor

Unfortunately I didn't find any stand alone board for that, only using multiple mini DSP's or integrated in pro amps like the iNUKE

If anyone know how to do that let me know.
Sure has small adau1701 based DSP board:

Sure Electronics' webstore DSP
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