Bummer! It was active when I initially posted it! Hope his site gets back on line soon as it's loaded with valuable tech info.
Glad I saved this doc though!
Glad I saved this doc though!
Thank you, i will read it.
The other link had real good explanation about VAS, and i now understand it more then before.
I understand i will have some looses for the E-145 in only 28 liter netto, because of the "hard jobb" to compresse so "little" air.
What do you think is the less negative arrangement in my case?
I have simulate in winisd on a small reflex "solution" for the E145 in only 28 liter netto, and it looks "maby okey" to have it tuned to ca 45 hz and use a 57 mm long 4,7 cm port.
Lowpass at 600 hz and highpass at 150 hz
Do you think its a bad solution?
Regards John
Attachments
Then the E-145, AGA compression driver and the JBL 2405h.
Hard for me to interpret at an "expert level", but think the JBL 2405h curve would be straighter.
And the Aga driver falls of to soon in the JBL 2344a horn clone, but will do more mesaurements also of axis.
Also did a mesaurement on E145, Aga and 2405h together, even if its hard to have the mic in a "good" place for that mesaurement.
Also sending with a comparison on the JBL spec on the 2344a horn and my clone measurement with the Aga driver.
And last pic a average of them all including 2235, exept the port mesaurement.
Regards John
Hard for me to interpret at an "expert level", but think the JBL 2405h curve would be straighter.
And the Aga driver falls of to soon in the JBL 2344a horn clone, but will do more mesaurements also of axis.
Also did a mesaurement on E145, Aga and 2405h together, even if its hard to have the mic in a "good" place for that mesaurement.
Also sending with a comparison on the JBL spec on the 2344a horn and my clone measurement with the Aga driver.
And last pic a average of them all including 2235, exept the port mesaurement.
Regards John
Attachments
Keep working on with my project, and have made fronts for upper and lower part for one of the speakers..
Much work but moving forward also with the other speaker..
Weight now is around 150 kg each, so not easy to move around when i work with them. ( better to work outside sunny day´s, but it´s trickey)
Haven´t done any more mesaurement yet, but have begain working on the filters.
Regards John
Much work but moving forward also with the other speaker..
Weight now is around 150 kg each, so not easy to move around when i work with them. ( better to work outside sunny day´s, but it´s trickey)
Haven´t done any more mesaurement yet, but have begain working on the filters.
Regards John
Attachments
Okey, time for some tweaking and filteradjustment 🙂
Have a 8 ohm JBL 2235h and a 8 ohm JBL E-145, and a 16 ohm old AGA driver and a 16 ohm JBL 2405h driver.
Real hard for me as "newbi" to make xover....dosen´t make it easyer that it´s a 4-way 😉
But give up its not an option, so keep fighting on.
Regards John
Have a 8 ohm JBL 2235h and a 8 ohm JBL E-145, and a 16 ohm old AGA driver and a 16 ohm JBL 2405h driver.
Real hard for me as "newbi" to make xover....dosen´t make it easyer that it´s a 4-way 😉
But give up its not an option, so keep fighting on.
Regards John
Attachments
In my final adjustments on the passive 4 way xovers....an accident happened!
2 months of work disappeared in a split second when my kids run into xovers lying loose on the floor.
Parts covering the floor....... components I used as well as all the components I tested with were lying around like a hand grenade had exploded flying everywhere and the 30+ coils, 30+ caps and all the resistors were mixed up over a 4x4 meter area.
The speakers were too heavy to "move around" so I think I was smart to put them in a place where I could work behind them and construct xovers on the floor...Outside my youngest daughter's room 👍
And it diden´t helpt me that i had work on 3-4 different xover over a long period of time simultaneously.
Really tried to "re-build" it again but almost every solderpoint had loosen, and i only had 2 coils to begain the re-build with.
And my head was totaly blank.....even with all my notes and drawings, i know i did some more changes and that in the end "a really small strange" adjustment made everything perfect!
Had really tried to get to the "same point" again, but it seems impossilbe.
Think its because im working with two 8 ohms driver and a 16 and a 20 ohm driver together in a 4-way, and i dont have the 20 ohm drivers impedance curve.
In this xover-building even a 0,1 uF cap make a quite big differance, and i have never done a more difficult one.
But here is my first recording on my "new" xover. without the JBL 2235h.
Tha Aga driver plays voicees/piano/guitar super realistic, and thats my reference regarding 150 hz & above.
Never give up!
/John
2 months of work disappeared in a split second when my kids run into xovers lying loose on the floor.
Parts covering the floor....... components I used as well as all the components I tested with were lying around like a hand grenade had exploded flying everywhere and the 30+ coils, 30+ caps and all the resistors were mixed up over a 4x4 meter area.
The speakers were too heavy to "move around" so I think I was smart to put them in a place where I could work behind them and construct xovers on the floor...Outside my youngest daughter's room 👍
And it diden´t helpt me that i had work on 3-4 different xover over a long period of time simultaneously.
Really tried to "re-build" it again but almost every solderpoint had loosen, and i only had 2 coils to begain the re-build with.
And my head was totaly blank.....even with all my notes and drawings, i know i did some more changes and that in the end "a really small strange" adjustment made everything perfect!
Had really tried to get to the "same point" again, but it seems impossilbe.
Think its because im working with two 8 ohms driver and a 16 and a 20 ohm driver together in a 4-way, and i dont have the 20 ohm drivers impedance curve.
In this xover-building even a 0,1 uF cap make a quite big differance, and i have never done a more difficult one.
But here is my first recording on my "new" xover. without the JBL 2235h.
Tha Aga driver plays voicees/piano/guitar super realistic, and thats my reference regarding 150 hz & above.
Never give up!
/John
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