The secret of building a good 2-way

[tinitus]

OK then, thats surely much better

 

[DcibeL]

In 40 years of building speakers the best 2-way i've done is Tysen... active XO (PLLXO @ 333Hz) SDX8 sealed, FF85KeN in midTL.

Hi Dave,
I am intrigued by your two way utilizing a widerange driver. I have always been interested to build a two way in this fashion, but when comparing the use of a widerange driver to a small 1" tweeter, I found that widerange drivers have rather poor off-axis response at high frequencies. I believe this is due to basically beaming due to the large cone. A regular tweeter does much better in this sense, so I am forced to choose between poor high frequency off-axis (and for many drivers on-axis as well) response, or a crossover in an area where hearing is most sensitive. Would you agree?

And no, I don't think crossovers are evil at all, just too many speakers with non-optimal designs (read: poorly designed).

 

[planet10]

but when comparing the use of a widerange driver to a small 1" tweeter, I found that widerange drivers have rather poor off-axis response at high frequencies.

I often think of the FF85 as a 1" dome with a really big surround... on this one the dustcap is attached directly to the end of the voice coil.

dave

 

[Salas]

But the purity and treble of EJ Jordan JXR6HD is tops....At a price of course.

 

[d to the g]

In 40 years of building speakers the best 2-way i've done is Tysen... active XO (PLLXO @ 333Hz) SDX8 sealed, FF85KeN in midTL.

dave

I guess I'm not sure how a PLLXO (passive line level crossover) can be active.

 

[Salas]

Tired 2 Way Box

Salas,

Your Seas/HDS 2 way looks intriguing. Where is that one documented?

Roger

Nowhere. I have the Leap crossover schematic data, I must measure the cabinet dimensions when I will visit my friend's place really soon and I will post here.

 

[454Casull]

I guess I'm not sure how a PLLXO (passive line level crossover) can be active.

Perhaps it stands for phase locked loop... maybe.

 

[Salas]

Tired 2 Way XO

Woofer = SEAS CA22RNY
Tweeter = Peerless HDS

L1 = 2.5mH (2mm d. wire)
L2 = 0.25mH (1mm d. wire)
L3 = 1mH (1mm d. wire)
C1= 4u7//0.68u PP high quality
C2 =10u//2u2 PP high quality
C3 =33u NP//0.22u PP high quality
R1 = 3R9 10W Mills
R3 = 15R 10W Cement

No polarity inversion nowhere. All inductors air core.

 

[Salas]

The woofer.

 

[Salas]

The tweeter.

 

[planet10]

the purity and treble of EJ Jordan JXR6HD is tops...

Don't be so sure... I'm sure the Jordan is very good, but once i'm done with the FF85 it is pretty good.

I don't know when i'll get a chance to listen to them, but i am sending a set of uFonken to the guy who made all but the latest JXRs. It will be interesting to get his feedback.

dave

 

[Salas]

Listen to the Jordan if you get a chance. Recommended.

 

[planet10]

I guess I'm not sure how a PLLXO (passive line level crossover) can be active.

An active speaker to me is one that has an amplifier for every driver.

dave

 

[planet10]

Listen to the Jordan if you get a chance. Recommended.

You can be sure i will if i get the chance.

Are yours pre- or post EAD?

dave

 

[Salas]

Pre.

 

[roger_lew]

Salas,

Thanks for the drawing and the crossover schematic. I'm very impressed. I can definitely see the value in this combination.

My dad's been talking about getting some floor standing speakers. Maybe I can talk him into letting me build him a pair.

Roger

 

[planet10]

Bill,

There is a plan... i've been too busy to start a thread on it (and to get it into public format). At this point just email me for plans.

dave

After a large number of requests for the plans i got off my butt and started a thread

http://www.diyaudio.com/forums/showthread.php?s=&threadid=144099

dave

 

[Salas]

Salas,

Thanks for the drawing and the crossover schematic. I'm very impressed. I can definitely see the value in this combination.

My dad's been talking about getting some floor standing speakers. Maybe I can talk him into letting me build him a pair.

Roger

They use current and good value for money drivers, they are efficient enough, have friendly impedance, take some power, go low enough, not small, not big, have shown all minute differences in my phono stages with ease and true tone. Can't lose by making a classic 8inch good 2way.

 

[lt cdr data]

there ARE secrets, there are 3.

1/ there are no secrets
2/ you have to know what you are doing and understand it
3/ occasionally, a bit of magic may come along, and you may produce a gem, but it defies logical analysis.

that's all, knowledge, experience, and luck, no secrets.

 

[DcibeL]

there ARE secrets

there are no secrets

I'm so confused.

I'm sticking with my original statement (post 3).