Flex Your PCD Mettle:

[phred593]

how to enter R2 into PCD

I am having a hard time configuring PCD to accept R2 in the tweeter circuit of the econowave crossover into PCD location R14.

For example using one of Zilches studies, I want to emulate the "SpitWad". In that econowave crossover, R2 is the dampening resister used for the compression drivers high freq contour circuit. So I start by importing into PCD both the zma and frd files for the compression driver. Then I add a second order crossover in PCD in locations C9 and L9, which are the equivalent econowave crossover values for C1 and L1. Next I want to add econowave crossover value R2 into PCD location R14, but it is blacked out in PCD.

Please help.
Regards!

[Zilch]

EconoWave Crossover in PCD:

Model the highpass as 4th order:

1) C9 & L9 are the core filter,
2) C10 is 1000 uF; lower that to something real for true 3rd order, if required,
3) L10 is 0 mH, E-Wave's R2 goes into its DCR as R14
4) In series after the HP filter gets E-Wave's C1, R1 as "Parallel RC Contour Filter" C11, R15,
5) The L-pad at 1:00 is already in the HF driver.frd.

Thus, the full range of Wayne Parham's crossover topology may be modeled in PCD. Make the lowpass 3rd order, if required, add a Zobel, damping resistor in series with C2, whatever is desired.

I think Pete uses a different approach, but that's how I do it....

[stgdz]

Re: Flex Your PCD Mettle:

any progress made on the 152 waveguide and parts express?

[Zilch]

Re: Flex Your PCD Mettle:

I have inquired, but do not have a direct communication path to whoever's doing it there....

[bwaslo]

Re: Flex Your PCD Mettle:

I have some inside connections. They have a sample of the waveguide in hand (from me), and are looking into the possibility of sourcing the waveguides directly from QSC. No word yet on whether that will work.

[phred593]

Re: EconoWave Crossover in PCD:

Model the highpass as 4th order:

1) C9 & L9 are the core filter,
2) C10 is 1000 uF; lower that to something real for true 3rd order, if required,
3) L10 is 0 mH, E-Wave's R2 goes into its DCR as R14
4) In series after the HP filter gets E-Wave's C1, R1 as "Parallel RC Contour Filter" C11, R15,
5) The L-pad at 1:00 is already in the HF driver.frd.

Thus, the full range of Wayne Parham's crossover topology may be modeled in PCD. Make the lowpass 3rd order, if required, add a Zobel, damping resistor in series with C2, whatever is desired.

I think Pete uses a different approach, but that's how I do it....

Thank you very much Zilch!

[stgdz]

Re: Flex Your PCD Mettle:

So I seem to have run into a problem with my econo wave mutant 10e surround.


I substituted the dayton 10 pro woofer for the 10e and used the 152i waveguide instead of the round one.


I got around to measuring it because I just wasn't hearing a midrange with them. Turns out I was rite
Woofer

Both combined

Note this is in my basement and using a rat shack meter but it got some decent results.

So the upper range looks fine and rolls off around 2k but the woofer looks like it rolls off around 300. I used the same crossover as the 10e, any idea why its not crossing at 2k on the woofer?

[donprice]

Re: Flex Your PCD Mettle:

If the combined response is less than the woofer alone, try reversing the polarity on the HF driver.

You need a really big room to measure 300 Hz...don't worry about it.

[srbliss]

Re: EconoWave HPB+ Data:

Can someone tell me what the final crossover ended up being for this configuration? I just may have to build a pair.
Steve

Raw driver responses:




Here, in PCD:




The measured result:

[donprice]

Re: EconoWave HPB+ Data:

Can someone tell me what the final crossover ended up being for this configuration? I just may have to build a pair.
Steve

I believe that would be the post # 707. Nothing econo about it but you already know that. :D

[srbliss]

Re: EconoWave HPB+ Data:

I saw that but there are a lot of mods that went on after this was posted. Fortunately before I was house poor I was able get the 2452H-SL's, waveguides and a nice pair of 2235's to make my 'FrankenVals' (old Altec Valentias with JBLs loaded.) The one I have done sounds pretty good - thanks to Zilch (I am fortunate to live an hour away so I get to visit the master in person.)
But the cabinet is really a huge compromise and needs to go so I am thinking the not so econo-HP plus my 2235's in B380 sub clones my be the way to go.
Steve

I believe that would be the post # 707. Nothing econo about it but you already know that. :D

[Zilch]

Re: Flex Your PCD Mettle:

Seems I'm just not real good at keeping secrets from you guys.... ;)

80642/1060=76.0774

[Zilch]

EconoWave Mini S-8: Summary





Errata: 'Til I get around to fixing it, correct PE Part# for L1 is 255-032.

[Zilch]

EconoWave Mini S-8 Addendum

3D3A Laboratory Variants:

http://www.princeton.edu/3D3A/

[I'll show 'em here.... ]

[stgdz]

Re: Flex Your PCD Mettle:

Looks like we have an econowave surround now
How well would they play with the SRs?


So the two directivity plots, one is for the two different mounting configurations correct?