I am trying to get a basic dial in for my Eminence 2002 CD.
https://www.parts-express.com/pedocs/specs/290-448--eminence-psd2002s-16-spec-sheet.pdf
Using it as is just over powers the 15 Inch Gama and the 8 inch full range.
Im using a 22 ohms in series and 6 ohms across. Using the L pad calculator on Rod Elliots site.
https://sound-au.com/articles/l-pad-calc.htm#s1
I get a value off -18.42 Db
Why these values well cause I have them on hand.
Even at this level I still feel its over powering the other drivers.
The other drives are all above 96 DB. So In my mind I had thought 104-96= 8
So that is the number I started with -8 Db. But it only started to get close at -18.4 Db.
https://www.toutlehautparleur.com/media/catalog/product/datasheet/eminence/GAMMA-15A-8.pdf
Does the horn used impact the SPL ?.
Waiting on my Umic 1 to do a better job.
Just curious to know how others have configured their CDs. What kind of DB drop do you land up with.
If it matters its an Eminence Horn. Don't remember the exact model.
Have been lurking on Pi speakers forum to see if I could find any info.
https://www.parts-express.com/pedocs/specs/290-448--eminence-psd2002s-16-spec-sheet.pdf
Using it as is just over powers the 15 Inch Gama and the 8 inch full range.
Im using a 22 ohms in series and 6 ohms across. Using the L pad calculator on Rod Elliots site.
https://sound-au.com/articles/l-pad-calc.htm#s1
I get a value off -18.42 Db
Why these values well cause I have them on hand.
Even at this level I still feel its over powering the other drivers.
The other drives are all above 96 DB. So In my mind I had thought 104-96= 8
So that is the number I started with -8 Db. But it only started to get close at -18.4 Db.
https://www.toutlehautparleur.com/media/catalog/product/datasheet/eminence/GAMMA-15A-8.pdf
Does the horn used impact the SPL ?.
Waiting on my Umic 1 to do a better job.
Just curious to know how others have configured their CDs. What kind of DB drop do you land up with.
If it matters its an Eminence Horn. Don't remember the exact model.
Have been lurking on Pi speakers forum to see if I could find any info.
I dont have the resistors to give me 25 ohms total.
Initially I was just adding the resistor in series via a trim pot to get a basic idea. Of how much resistiance it would take to get the CD to sound in sync with the other drivers. But then I read a long paper on why L pads are better. So switched to using L pads. Tried in various steps from -1 Db all the way to -20 Db. The sweet spot seems to be somewhere in the range off -15db to -19db. By ear. And a simple SPL meter on my phone.
Just checking in with others who use CDs if this is normal. Cause hardly anybody uses CDs in my country.
When I got the drivers they had a 10 ohms serial and 3ohms across. With a 30uf cap in series. But was told the Cross over would need to be re-done as the previous owner never got down to doing it.
Initially I was just adding the resistor in series via a trim pot to get a basic idea. Of how much resistiance it would take to get the CD to sound in sync with the other drivers. But then I read a long paper on why L pads are better. So switched to using L pads. Tried in various steps from -1 Db all the way to -20 Db. The sweet spot seems to be somewhere in the range off -15db to -19db. By ear. And a simple SPL meter on my phone.
Just checking in with others who use CDs if this is normal. Cause hardly anybody uses CDs in my country.
When I got the drivers they had a 10 ohms serial and 3ohms across. With a 30uf cap in series. But was told the Cross over would need to be re-done as the previous owner never got down to doing it.
L-pads are good, they can reduce impedance variations.. However you're using the other side of that calculator.
Therefore you are changing the load on the crossover. You may be breaking it unless you keep the load the same. You must consider the whole crossover. Perhaps you could post it..
Therefore you are changing the load on the crossover. You may be breaking it unless you keep the load the same. You must consider the whole crossover. Perhaps you could post it..
Oh man i must have over a 100 prospective cross over designs for this setup. Including the one made by emience with a 1.6k crossing.
I did try using the right side of that calculator but it was recomending stuff like a 2 ohm resistor across the terminals im not comfortable putting under 4 ohms across the terminals no matter what the calculator says.
Its a simple question how do you match a cd with a horn to the other drivers what kind of db range do you drop it by. -10 / -15 / or less. Lets say your other drives are all in the low 90s for effiency.
My last attempt at a cross over with matching zma and frd files was posted here let me find the link.
I did try using the right side of that calculator but it was recomending stuff like a 2 ohm resistor across the terminals im not comfortable putting under 4 ohms across the terminals no matter what the calculator says.
Its a simple question how do you match a cd with a horn to the other drivers what kind of db range do you drop it by. -10 / -15 / or less. Lets say your other drives are all in the low 90s for effiency.
My last attempt at a cross over with matching zma and frd files was posted here let me find the link.
For now, yes it's not unusual to drop it quite some dB, and to go below 2 ohms across the voice coil when you do.
Although when you simulate them all at once you can go to any impedance you like. Great for someone building a unique amplifier. 🙂
Although when you simulate them all at once you can go to any impedance you like. Great for someone building a unique amplifier. 🙂
This was a good read.
https://www.pispeakers.com/Pi_Speakers_Info.pdf
Nothing unique about my amplifier other than I'm trying to give each driver its own channel. Thus reducing my need for complex or costly crossover parts.
https://www.pispeakers.com/Pi_Speakers_Info.pdf
Nothing unique about my amplifier other than I'm trying to give each driver its own channel. Thus reducing my need for complex or costly crossover parts.