Ukkonen AWG Photos

Tasmanian Blackwood

Candy Red

Cobalt Blue Metallic

soon 🙂 🙂

That 1st post Tasmanian Oak is just gorgeous! :love:

Is that a vent at the bottom of the cabinet?

Holmz wrote:
Is that a vent at the bottom of the cabinet?

Yes, ported design

Alan March wrote:
Yes, ported design

Alan, I've never seen a slit like yours used as a bass port of sorts. Can you explain the advantages/disadvantages of having a slit vs standard oval ports for bass reproduction? Is it better SPL, distortion, frequency extension or something else?

SmartOne_2000 wrote:
Alan, I've never seen a slit like yours used as a bass port of sorts. Can you explain the advantages/disadvantages of having a slit vs standard oval ports for bass reproduction? Is it better SPL, distortion, frequency extension or something else?

They are pretty common for transmission line style of folded ports.

SmartOne_2000 wrote:
Alan, I've never seen a slit like yours used as a bass port of sorts. Can you explain the advantages/disadvantages of having a slit vs standard oval ports for bass reproduction? Is it better SPL, distortion, frequency extension or something else?

I wouldnt say they are common, but they are certainly about. Ports dont have to be round. They just need to be able to flow the requisite mass and velocity of air without undue turbulence, and of course be tuned to the correct frequency. There is no particular advantage to slot ports, however in our designs they work very well in terms of placement and cabinet construction.

Also we have configured them so that they dont leak frequencies outside of their range like many designs do.

From an Ukkonen review

https://marchaudio.com/wp-content/uploads/2024/09/Ukkonen-Review-Australian-HiFi-July-August-2024-_Batch-Compress_1.pdf

So, maybe with a taller slot, can you can further extend the lower frequency response from Graph 1 to be flat down to 20Hz or below? Does graph 1 include room gain?

This speaker only has 1 woofer but the Sointuva bookshelf has 3 for almost similar frequency response. With added room gain, these frequency responses should be almost identical. Is this a fair assessment?

The Aus Hifi measurements are quasi anechoic, so no room gain. Their technique isn't as accurate as a Klippel NFS. They show its only a couple of dB down at 20Hz.

I dont think you will find another speaker in this class, or even vaguely close in price that manges that sort of low frequency extension.

Tweaks to the port would be more aimed at reducing the minor peak at about 50Hz, as this is more audible than anything happening at 20Hz, but this would also have the effect of slightly increasing the output lower down.

Alan March wrote:
The Aus Hifi measurements are quasi anechoic, so no room gain. Their technique isn't as accurate as a Klippel NFS. They show its only a couple of dB down at 20Hz.

I dont think you will find another speaker in this class, or even vaguely close in price that manges that sort of low frequency extension.

Tweaks to the port would be more aimed at reducing the minor peak at about 50Hz, as this is more audible than anything happening at 20Hz, but this would also have the effect of slightly increasing the output lower down.

Ok, so it should be lower dB at 20Hz per your specs than is shown by the quasi anechoic measurements. Is adding more woofers a possible option to resolve this issue in the future (and possible improve efficiency) or would the 6dB of room gain make the response flat down to 20Hz?

SmartOne_2000 wrote:
Ok, so it should be lower dB at 20Hz per your specs than is shown by the quasi anechoic measurements. Is adding more woofers a possible option to resolve this issue in the future (and possible improve efficiency) or would the 6dB of room gain make the response flat down to 20Hz?

There is no issue. Why are you concerned about -2dB at 20Hz? Which would be more than compensated for by room gain. Most speakers dont manage that level of flatness in their main frequency range.

You can add more woofers. That will make it more expensive. Is there any need? Does the market want it?

SmartOne_2000 wrote:
This speaker only has 1 woofer but the Sointuva bookshelf has 3 for almost similar frequency response. With added room gain, these frequency responses should be almost identical. Is this a fair assessment?

No, the Sointuva only has 1 woofer. The rear devices are passive radiators. They serve the same purpose as a port. We use them in that design because parameters of that woofer would require a very long port that is difficult to fit in that size of cabinet.

The sountuva, whilst having possibly the most extended low frequency response of any speaker of that size, does not go as low as the Ukkonen. Even with room gain. Plus it won't play as loud with more limited woofer displacement at the lower frequencies