Is it possible to cover the whole spectrum, high SPL, low distortion with a 2-way?

Jump to Latest
#8,902
Brinkman said:
..They are possibly using it more like a midbass module by crossing around 200Hz to cancel floor reflections...
Click to expand...

Oh so thats the trick....




When I first looked at the graph below I was mad that there was no connection to alphabetic order and other aspect of mass or motor listed by the character

My interpretation; At face value these charts serve to say that there is no obvious connection to mass/motor and superior performance of "distortion" (what ever one they are referring to) sensitivity and max spl.

attachment.php
 

Attachments

  • WUjVOq7.png
    WUjVOq7.png
    138.9 KB · Views: 1,122
Last edited:
#8,903
camplo said:
When I first looked at the graph below I was mad that there was no connection to alphabetic order and other aspect of mass or motor listed by the character

My interpretation; At face value these charts serve to say that there is no obvious connection to mass/motor and superior performance of "distortion" (what ever one they are referring to) sensitivity and max spl.
Click to expand...

Look at A lowest mass lower performance distortion wise highest sensitivity. That's a hint look at higher mass like G and look at the ratings.

You really need to look at the entire paper. The conclusion is opposing requirements that need to be juggled by the designer for the desired overall response.

Rob🙂
 
#8,904
The driver models are not indicated, but from the description of the drivers it can be understood that G and I are JBL (G is with Aquaplast coating), the J driver is TAD 1601 (the only driver with Alnico magnets), the N driver is with a neodymium magnet and a heatsink (I think at that time, very few such drivers were produced, and if you look for 15 "drivers of those years with Nd magnets, you can determine the manufacturer.) The description indicates that some of the drivers are guitar.
 
#8,906
InspectorGadget said:
Yes, much smaller woofer for me. 1" waveguide loaded dome, 6.5" midwoofer, with 2 x 10" subs, which will probably end up crossed at 100Hz and 2.2khz. Its a compromise.
Click to expand...

I consider that the most important benefit of 2 way horn (and full range) is it does not have a crossover around 2K. We can hear the difference if we compare them (with crossover vs without) side by side. I would not call this a compromise, it is a very different direction.
 
#8,908
plasnu said:
I consider that the most important benefit of 2 way horn (and full range) is it does not have a crossover around 2K. We can hear the difference if we compare them (with crossover vs without) side by side. I would not call this a compromise, it is a very different direction.
Click to expand...

Well, we'll see where it ends up. bonus of active and the WG. with the drivers I have, I probably have the freedom to play with M->T XO anywhere from 1500->2500. just matter of where it lands.

by compromise, I dont mean a compromise between some ideal 2 way, starting from scratch buying drivers and enclosure with large WG. I mean it's a compromise in general, given my space and the fact I have some drivers already. next build will in all likelihood be a 2 way with pro drivers, but that's a ways off and i'm not entirely convinced I would prefer with no subs. space is too small for econowave types. XO is digital and I will do most listening fairly nearfield. aside from the DAC. i'm doing my best to use as many parts that I have already, which is many. I bought the parts years ago, just haven't had any workshop space for years and i'd rather not spend up big on drivers again just yet. Then I can play with quite different designs and drivers and take my time on the enclosure, iteratively fixing any problems identified and hopefully kitted out with reasonable CNC in the shed by then..
 
Last edited:
#8,910
Thanks!! This one will be a learning experience. Hell, I may end up just replacing the revelators with something from purifi, like the new PTT6.5X04-NAA-08, maybe even an 8", when they release it, team it with some bliesma be domes and leave it at that. the 6.5 would drop right into the place of the revelators and maybe it could end there for a bit, but i'm intrigued to see what they can do with 8 and 10" models; provided they dont cost more than $500 each.
 
#8,916
Yeah I believe that, I'm looking at the spec sheet for the 2226J vs 2226H and it only list one set of Q specs.


If I remember correctly....Q can be adjusted via slope of the roll off via EQ? If this is true.... then the only disadvantage I am left with regarding the AETD15m I have with Q=6 and Tm=17 Re=12.5 is the loss of sensitivity from the weak motor force.

Is this something I can have the manufacturer "fix"?
 
#8,919
phase_accurate said:
Hi Camplo
Since you want to lower the Qts you can't just take a resistor out of your parts bin because you would need a negative resistor and those don't come in the usual form of a component with two leads. It has to be synthesized using current feedback from the amp's output. The active PSI studio monitors use something like that. Another method that gives the same response without using current feedback is the use of EQ. If the fc is correct and only the Qtc is wrong you can get the desired response with a parametric EQ. If both the fc and Qtc have to be corrected you can use a biquadratic filter like the Linkwitz transform for instance.
Charles
Click to expand...

Does changing the roll off change Qes?

If these measurements are accurate
attachment.php

Changing Qes to .3 gives me correct BL. So can a filter cause that?...is what I am getting at?
 

Attachments

  • measure15m.jpg
    measure15m.jpg
    370 KB · Views: 471
Last edited:
You must log in or register to reply here.
Top Bottom