GM JX92S MLTL-48 Triangle (JIT for UK Meet)

[vitalstates]

I'm also new to fullrange, as in I'd never heard any drivers running full range till the weekend - and then I heard no fewer than three!! One set were open-baffle and had 3 full range drivers (2 x 12" Goodmans Axiom and a smaller (Fostex iirc) driver). These had a very clear and pretty dynamic and extended sound with a lot of detail. They did shout a little bit though. I can't even remember what they were playing though!

Simon

1 x axiom, 1 x 301, 1 lowther ex4

I hope your ears are better than your eyes Simon!! lol jus kiddin

 

[SimontY]

Haha, very good sir

Thanks for filling in the gaps. Were either of these your speakers?

 

[vitalstates]

Hi Simon

yeah well spotted, I have to fess up I was defending my TQWP. Build details on my website if you're at all interested.

Regards

Ed

 

[SimontY]

Hi Simon

yeah well spotted, I have to fess up I was defending my TQWP. Build details on my website if you're at all interested.

Regards

Ed

I can't help being honest

I only got a brief listen but I was impressed more than unimpressed!

Only £250 to build? Wow!

And a stunning finish too. Sorry for OT.

 

[philpoole]

Thanks Andy again for your reply.

I can't build any speakers at the moment (small kids and routers don't seem to mix), but its a long term goal to build some one day. This is definitely a route to investigate.

Cheers,
Phil

 

[Colin]

Colin is the man with 48" MLTLs. Sadly, he could not be at the meet.

Andy

Sorry to miss the demo. As I've mentioned before, the MLTLs work really well with classical and acoustic but not ideal for heavy rock (the Jordan drivers were never designed for that anyway). I have tried mine with a Massive Attack track (from the Pi movie soundtrack) and it was captivating how the complex bass lines started to emerge and became easier to follow.

 

[Colin]

Greets!

FWIW, on one of the Jordan threads I noted that for corner loading the triangular variant, cutting the lower rear tip off leaving the same vent area (seal up the front vent) yields a bit more gain that can be fine tuned by adjusting the speaker/corner gap.

GM

Hi Greg

Sorry to be dense but I can't picture this. Do you mean leaving the same cross-section area and sealing the front vent?

 

[GM]

Greets!

Right, you're just relocating the same vent area to a different location to get better corner loading by 'firing' the vent into the corner's throat' (apex) rather than from its 'mouth', so to speak.

GM

 

[Colin]

Okay, I get it now.

Query for Chris - how did you finish the speakers? They look very good in the pics and I know from personal experience that mdf can be a pain to paint.

 

[RAndyB]

Right, you're just relocating the same vent area to a different location to get better corner loading by 'firing' the vent into the corner's throat' (apex) rather than from its 'mouth', so to speak.

GM,

almost horn loading?

Andy

 

[GM]

Greets!

Well, horn loading like a 'BVR' style BLH, only the corner is the horn section, though with a faster/longer expansion, ergo will typically have more gain BW unless the 'BVR' in placed in the corner.

GM

 

[RAndyB]

Big vent reflex back loaded horn

GM,
so it is no longer a mass loaded transmission line? having removed the tube that is the "mass".
(my brain cells are slowly starting to work, or maybe it's just a headache from the dismal weather here in England)
Andy

 

[GM]

Greets!

??? It's still an MLTL, just that now the 'ML' part is a much higher mass horn formed by the room corner instead of the puny little air mass plug in a simple tube vent, so think of it as a MLTL on steroids.

GM

 

[Akita]

Wow great job! again how you finish the mdf?

 

[Mr Chris]

Hello Colin, Akita

For finishing the MDF I used International Paints MDF primer followed by a standard undercoat then Dulux Satinwood "Tuscan Treasure 3" a close match to a Toblerone box.

All applied with a 4" foam roller - no actually I couldn't be bothered to clean the foam one after the undercoat so as the disposable roller set comes with a foam for gloss and a 'fluffy' for emulsion I gave the fluffy a haircut and used that for the top coat!

Chris