Beyond the Ariel

[bonjonno]

Tony

Thanks. I was trying to save a few bucks but you are completely right. Do you think about 50 uF per bundle is a good starting point for these hemp midranges?

Jon

[ttan98]

Originally posted by Graham Maynard
Two 10" to 12" LS side by side are going to lead to notable voice reproduction anomalies for any listening done off-axis, especially with a combining reflected rear wave.

Its not just the centre to centre spacing, but the overall spacing between outer cone edges which will promote frequency selective interferences.

Cheers ........... Graham.

Emerald physics has TWW configuration in open baffle, T is a compr driver and WW are twin 15" mounted side by side. The X-over between T and W is 1Khz using active LR4. See website:
http://emeraldphysics.com/specs.htm

for details.

These speakers received wide acceptance for their sound reproduction, how do you think the designer solve the problem you raised?

[augerpro]

Lynn the DE25 appears to be discontinued. What is the current replacement?

[apassgear]

Originally posted by bonjonno
Tony

Thanks. I was trying to save a few bucks but you are completely right. Do you think about 50 uF per bundle is a good starting point for these hemp midranges?

Jon

Jon,

You will have to decide on the XO point and calculate your starting xo parts and test from there on. Lil’Buddy has Fs of 150 so the minimum XO point should be arround 300 hz on a 2nd order filter. Personally I would shoot for a 400/500 Hz point for some breathing space for the bass speaker also.

[Graham Maynard]

Hi ttan98.

I see vertical mounting in your link, not horizontal ?

Cheers ........ Graham.

[dmason]

My own uninformed opinion as to why the Emerald Physics OB offering was so well received is because there were a ton of people who had never heard a reasonably well executed FULL RANGE open baffle set up. Most of the people commenting were high dog, monkey coffin listeners, and those, sound nothing like OB. Second, the Emerald is about the only commercial offering I can think of that addressed employing open baffle response for the lower register/bass in the design; the Bastanis had similar approbation at these shows, but is in my mind, an essentially flawed design in that it uses sealed drivers for bass. The money zone in OB sonics is <1500Hz, as anyone whom has heard this likely will readily agree.

I also suspect "a" reason for the permanent, sealed opaque grilles is to obscure the fact that they are using some very inexpensive Eminence Alpha 15, and the bottom of the line BMS compression driver. What amazes me is the fact that the entire proceedings are dimmed and damaged by the Behringer active crossover these things are controlled by.

While I wish Emerald Physics all the success they deserve with their efforts, what makes this particular thread most interesting to me is that over time we will come up with permutations in design that should completely SLAY this arguably flawed commercial offering. Keeping the crossover away from the critical midband might be one start. When I heard the Emerald, I immediately preferred the presentation of the "DarkStar" if for no other reason that that it avoided any tampering between 200-10KHz. www.thuneau.com

[patrickkopson]

I have been unable to find a frequency responce graph for the Tone Tubbies. Can anyone point me to one? What upper cutoff frquency would you recommend for first/second order x-over?

thanks

[ScottG]

Originally posted by patrickkopson
I have been unable to find a frequency responce graph for the Tone Tubbies. Can anyone point me to one? What upper cutoff frquency would you recommend for first/second order x-over?

thanks

http://www.nutshellhifi.com/MLS/MLS6.html

[ttan98]

Originally posted by augerpro
Lynn the DE25 appears to be discontinued. What is the current replacement?

DE10 may not be a direct replacement, have not checked the spec., however I have used DE10 it is very good, also recommended by Magnetar. min. X-over freq. is 2.5Khz. About $38 each, yes $38.

If you want to go upmarket, go for DE250, it is excellent, I heard from users no equalization is reqd. min. x-over freq. is 1.5Khz. I think with a little tweaking you can cross as low as 1Khz. About $130 each.

[riff.ca]

Originally posted by dmason
the Emerald is about the only commercial offering I can think of that addressed employing open baffle response for the lower register/bass in the design

There is this $14K effort from a Klipsh Group Company.

http://www.jamo.com/Default.aspx?ID=...roductID=17862