lowerFE

The ultimate small speaker - final design peer review thread

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Wrapping up! Pictures don't do justice, but there it is!

 

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That looks really good man. Thumbs up on this. Now comes weeks of messing with DSP programming eh?

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That looks really good man. Thumbs up on this. Now comes weeks of messing with DSP programming eh?

 

 

Thank you! And yes, lots of DSP tinkering and measurements next. I'm trying to find good spaces to do measurements, and that's proven to be difficult. There is an outdoor parking lot which is great for ground plane measurement, but the asphalt surfaces ruins the measurement accuracy above 500Hz or so. Measuring at an indoor basketball court is fantastic, but they are really reluctant to let me use it, and when they do, it is at most for 1.5 hours, which isn't much time at all. I only have 3 hours worth of booking time lined up, and I need a lot more than that, especially for cardioid experimentations. 

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Nice work!

Ground plane. Get friendly with some pieces of plywood and duct tape. Place them on the pavement and tape the joints. Two sheets will allow you a 2 meter measurement distance all around your box.

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Or dig a hole in your yard or a field. That's what I have planned when I work on some speakers. Either that or rent a boom lift for a weekend.

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Nice work!

Ground plane. Get friendly with some pieces of plywood and duct tape. Place them on the pavement and tape the joints. Two sheets will allow you a 2 meter measurement distance all around your box.

 

I might do that, but that'll be the last resort. The issue is that the noise floor is too high, especially when measuring the rear response for cardioid experimentations. The parking lot I'm using has a few cars driving by every minute, so I'm always crossing my fingers hoping no cars come driving by when I'm doing a sweep  :D

 

Or dig a hole in your yard or a field. That's what I have planned when I work on some speakers. Either that or rent a boom lift for a weekend.

 

Now that's extreme! This will work for speaker measurements, but I have found that when I measure in my front yard my house actually acts as a wall and I can see a dip in the bass region caused by the reflection of the house. 

 

Good to hear you're going to do speakers! I think you'll find them to be just a little more complicated than sealed subs  :lol:

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I got the speakers yesterday, and I'm grinning uncontrollably as I listen to my speaker. rockout.png

I implemented the crossover and did some rough tuning. Even with no bass (passive radiators tuned too high), the sound quality already greatly exceeded my expectations.

The beryllium version of the Scanspeak Illuminator tweeter is 100% worth the 2.5x higher price. I expected minor improvements over the non beryllium version in my previous speaker, but the difference is drastic and immediately noticeable. The tweeter sounds sweeter and more detailed.

The Wavecor woofers are a significant upgrade over the Tang Band W4-1720 woofer. I'm hearing a ton of lower midrange detail I've never heard before.

The speaker also has much greater dynamics capabilities. Listening to music, especially classical music at high volumes is thrilling.

I can't wait to put this speaker through an extensive measurement and tuning session.

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That's excellent News!  Can you fix the PR tuning?

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That's excellent News!  Can you fix the PR tuning?

 

 

Yes, I just need to add mass to it to drop the tuning. Tang Band has 2 versions of the passive radiator I use, one with 25g Mms and one with 55g Mms. Based on what I'm seeing it looks like I have the 25g version when I thought I got the 55g. I'll just add enough mass until it hits the desired tuning. 

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