Box is 14L tuned at 36Hz. Ribbon is crossed at 1550Hz. For ribbon impedance match, amorphous core is used. Same as RAAL use.
On photo you can see back side.
This ribbon is ideal for open baffle system.
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As for myself, I'm more interested in the smaller one, the tweeter. Would love to see a thread on the details of exactly how you designed and built it. Such as magnet sourcing. How you precisely cut the foil without damaging it, where did you get the amorphous core transformers which RAAL uses, etc, etc.. Even though you used CNC cutting of the frame, please consider doing a read, thanks.
all magnets,cores and foil are sourced from China directly from factory. For small quantity problem is shipping because is too expensive. . Cutting foil is little complicate but not impossible. Just finished new more robust design. I will open new thread for all who are interested to buy finished ribbon.
Forgive my limited knowledge of the topic but wouldn't efficiency have to be taken into account as well? In other words, an inefficient driver like the Purifi would be fed more current to match the SPL output and the increase in current would increase acceleration.
Yep - also more likely to need more current to 'open up' by that I understand, so the Purifi drivers might not fully come to life at lower volumes (I'm assuming based on my limited knowledge).
My point is, you have to define acceleration factor first, because it's certainly not how "fast" a driver reacts, acoustically anyhow, based on a given voltage.
Basically, you put some volts into the driver, the voice coil needs a current to create a magnetic field opposing the static field from the motor. That current is proportional to the voltage and inversely proportional to the impedance. Now that you have your current, which determines your force (with BL) and now you can determine the acceleration of the cone. But the acceleration of the voice coil by itself doesn't mean much - you need surface area to create sound. The more area you have, the more sound you get. No surface area = doesn't matter how "fast" the coil can swing.
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How about this?
I was interested in the earlier comment about the PHL1220, am also thinking that a trio of drivers (like, say, three Illuminator mid ranges on the Beolab 90) is also a very interesting way to go.
I'm also trying to work out what drivers may sound the most 'open' although lots of factors affect this.
My method of comparison may well be wrong?
I was interested in the earlier comment about the PHL1220, am also thinking that a trio of drivers (like, say, three Illuminator mid ranges on the Beolab 90) is also a very interesting way to go.
I'm also trying to work out what drivers may sound the most 'open' although lots of factors affect this.
My method of comparison may well be wrong?
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IMHO, the 18 sounds 6ND430 would also deserve a place on the list. It would be on the third place for a relatively modest expense...
Hi,
I am considering a two way build with purifi ptt6 and fusion amp plate (the remaining budget will decide the tweeter but probably Sba with 3dptinted WG). I probably have not read the entire post so sorry if my question has already been asked. I am trying to identify all of the passive radiator which could fit this driver and give inspiration. For the moment, I have seen:
- pair of matching purifi PR (hifi compass Puri Bliss on each side, March Audio Sointuva both on rear)
- pair of Sba SB15SFCR on each side (build post here)
- single Sba SB15SFCR (Selah audio purezza)
- unidentified (Joachim Gerhard surveyor)
Have you got other suggestion ? Aestheticly I would prefer a single PR on the rear but Hificompass gives technical good points in favor of one PR per side so I am open.
Finally if you have good readings (link) about passive radiator guidelines (choice, position, mass adjustment, etc...).
Thanks !
I am considering a two way build with purifi ptt6 and fusion amp plate (the remaining budget will decide the tweeter but probably Sba with 3dptinted WG). I probably have not read the entire post so sorry if my question has already been asked. I am trying to identify all of the passive radiator which could fit this driver and give inspiration. For the moment, I have seen:
- pair of matching purifi PR (hifi compass Puri Bliss on each side, March Audio Sointuva both on rear)
- pair of Sba SB15SFCR on each side (build post here)
- single Sba SB15SFCR (Selah audio purezza)
- unidentified (Joachim Gerhard surveyor)
Have you got other suggestion ? Aestheticly I would prefer a single PR on the rear but Hificompass gives technical good points in favor of one PR per side so I am open.
Finally if you have good readings (link) about passive radiator guidelines (choice, position, mass adjustment, etc...).
Thanks !