New Hi-Res Toys

[Salas]

EJ Jordan JXR6HD and Alcone. Designing a friend's speaker. Need get sealed cabinets good for 40Hz -3dB in room and let you know in due time.

http://www.ejjordan.co.uk/jxseries/jxr6.html

 

[wigginjs]

Very pretty

 

[sdclc126]

Alcone

Hello Salas - interesting combination - I've never seen any measurements of or projects with Alcone drivers - do you have prior experience with them and do you know how well they perform?

 

[Salas]

You will see by me soon. The woofer has a very good construction. The idea is to help the Jordan and stay away 3 octaves lower than Alcone's alu cone breakup. A cunning 2 way crossing in non sensitive area is the goal. Aluminum when well tempered is killer resolution. First measurements show +10Hz Fs than published. For frequency charts I have to arrange for the cabinets first since there is no meaning in general measuring.

 

[Salas]

On a positive note, I have seen that the manufacturer refers (in their homepage in German) to technical changes not mentioned in the Alcone AC 8 HE pdf. Their new Fs, Qms, Qes, and Qts matches mine taken after some hours of Fs sine wave run in. Vas measures 13 litres higher though. They need to revise their pdf. SPL is 91dB for 2.83V exactly as published.
This woofer looks perfect for the job I have in mind for it and its priced at 89 Euro. I wouldn't use it in a 2.5k cross normal two way speaker though. Its 5k metal cone breakup is strong and it will always create IMD as far as an octave lower even when a notch filter is applied and response at breakup looks cool.

 

[Salas]

...

 

[Consul]

I'll definitely be watching this thread with interest. Mating a full-ranger with a woofer was my original plan for a monitoring system for my studio.

 

[sdclc126]

Consul - sorry a total sidebar here but I can't resist -

"Never be afraid to try something new. Remember that a lone amateur built the Ark. A large group of professionals built the Titanic." - Dave Barry

- Not a fair comparison - consider the "lone amateur's" architect!

 

[Consul]

Okay, I'll give you that. Still, though, no matter how good the design, you still need a good builder to make it all work.

Kinda like DIY speakers, innit? (And watch how I deftly get us back on topic...)

 

[Salas]

That's how it must be offset for minimum diffraction.

 

[Salas]

The side must have a 4 degrees elevation angle so to make Jordan axis meet ear level at 2.5m.

 

[Salas]

Aluminum Bliss

The kid's got a name: Aluminum Bliss

Looks this one is gonna take advantage of aluminum goods without the nasties. Will see.

 

[nicoch58]

Good new toys to play Salas

xcross at 150-300hz ??

 

[Salas]

Probably 300-500Hz if I wanna keep the high pass first order. Better a NL4 Speakon at the back so it may be done active or with external crossover to tweak.

 

[Inductor]

Right. You can see the prototype holes for the previous binding posts.

 

[Inductor]

... and a 24 (mm) drill for the painel holes of the round mounting socket and pozy1 screw driver for the cable plug micro screws. Sorry taking so much space from you.

 

[Salas]

Use Mogami W2921 quad OFC between NL4s. You will appreciate it.

 

[jzagaja]

Hi there Salas,

I will finish something similar with Bandor 150 instead. The transmission line in RAL9001, white gloss topcoat polished by the hand.

 

[Salas]

Cool.

 

[jzagaja]

Polishing the topcoat is a hardest part of such a simple 1st order loudspeaker. Appended original Bandors proudly made in England