Dali Oberon 9 speakers

[Pieoftheday]

I don't know,website says Newcastle and workington

[Lawrence001]

I posted a thread on the Wam to hear if anyone had heard or indeed owned a pair of the Wilmslow Audio WA RTL3 which are based on the original TDL design. They were greeted with a fair bit of negativity from one Wammer. The comments were based on the original design and not Wilmslow audio's take on them. Has anyone here heard the Wilmslow version? Here are a couple of pics. They work out over a grand built.

I think the TDL RTLs were let down by the cheaper drivers, and I'm not sure the cabinet was as good as their Studio range either, that's where the quality was. If these are upgraded to the level of the Studio range them I think they'll be quite nice.

I'm not sure how the "Reflex Transmission Line" concept works though. It sounds like an attempt to find a hybrid to make the cabinet easier/cheaper to build if anything, but I'd like to know more.

[Macca]

It was just a fancy name for a port.

The RTL series did not have anything in common with the Studio series. But as budget speakers they were pretty good. I had a dem of the RTL2 and 3 many years ago when they were still current products.

You've had much better speakers in the past, Steve. Like those Ruark Crusaders. The RTLs don't come close to those.

[walpurgis]

Maybe it's a reflex box with an extended port equating to something like a 1/16 or 1/8 wavelength transmission line, but one principle relies on resonance phase inversion, the other would use the comparatively small amount of in phase signal at the exit of the line. I think IMF had a similar description with their ALS40 and ALS30 designs, but those terminated the line into an active driver. The B&W DM2 was an 1/8 wavelength line too, worked fine.

[Macca]

Maybe it's a reflex box with an extended port equating to something like a 1/16 or 1/8 wavelength transmission line, but one principle relies on resonance phase inversion, the other would use the comparatively small amount of in phase signal at the exit of the line. I think IMF had a similar description with their ALS40 and ALS30 designs, but those terminated the line into an active driver. The B&W DM2 was an 1/8 wavelength line too, worked fine.

Seems what they do is put a right-angled shelf inside at the back of the box, with a gap/slot between the vertical portion and the back wall of the cab and a gap between the horizontal portion and the bottom of the cab

So the back wave from the driver goes down the slot, across the bottom of the box and out through the front ports at the base of the speaker. The width of the slot determines the frequency of the bass tuning.

So it isn't a conventional reflex pipe but it's not a transmission line either.

http://www.tdl-loudspeakers.co.uk/reviews.htm

[Macca]

here's a drawing as my description not very clear:

[Lawrence001]

Seems what they do is put a right-angled shelf inside at the back of the box, with a gap/slot between the vertical portion and the back wall of the cab and a gap between the horizontal portion and the bottom of the cab

So the back wave from the driver goes down the slot, across the bottom of the box and out through the front ports at the base of the speaker. The width of the slot determines the frequency of the bass tuning.

So it isn't a conventional reflex pipe but it's not a transmission line either.

http://www.tdl-loudspeakers.co.uk/reviews.htm

Can't quite picture that any chance of a little diagram?

What Hifi in the links (RTL2 and Bass) describe it as true TL in the box which is very wrong.

[Ali Tait]

Sounds a bit like a TQWT.

[walpurgis]

So it isn't a conventional reflex pipe but it's not a transmission line either.

Not that different to the IMF Compact/Super Compact.

[struth]

Not that different to the IMF Compact/Super Compact.

had a pair of the supers'.. hungry speakers they were