I'd have to agree 100% about the issues with CCA wound VCs in high power PA drivers. Back when I first starting seeing a few failures in some of the Faital and B&C stuff, I traced it back to CCA VCs. Nowadays I won't use anything other than I/O wound copper VCs in very high power midbass applications. Even if CCA wound VCs don't fail soon after being put into hard use,
@maxolini CCA - Copper Clad Aluminium, which is essentially aluminium wire coated with copper.
The reference to I/O is a voice coil winding technique used to have the wire wound both on the inner and outer sides of the VC former. This is done to both expose the VC windings evenly for better cooling and to balance / distribute the driving forces to the VC former evenly.
The reference to I/O is a voice coil winding technique used to have the wire wound both on the inner and outer sides of the VC former. This is done to both expose the VC windings evenly for better cooling and to balance / distribute the driving forces to the VC former evenly.
I think the bunch of these what I call "Eurospeakers" with this wind now, have three windings on one side, and one winding on the other. So no evening out, and the middle winding from the three will not be very happy.
On the other hand my colleague overpowered his rig not long ago, and about everything went to hell, but not the 18DS115s in X1 subs, which were smelling already BEFORE he overpowered them very badly. These champs held. Also in the B&C LSI data, that shiz was worked past 20mm one way excursion, reaching about 200 degrees temp (Al hates anything above 170 degrees) and it held.
So, while there obviously IS higher risk of wear and issues with CCAW, it seems to be better controlled nowadays.
That's also where my setup kicks in. Avoiding the impedance valley, causing it to not eat as much power, not to heat up that much, and cool down with more excursion. These speakers might be safer in my application hopefully.
Time will tell, this is different on model to model basis. I would love to have this in copper, but they don't make em in the parameters set I need.
On the other hand my colleague overpowered his rig not long ago, and about everything went to hell, but not the 18DS115s in X1 subs, which were smelling already BEFORE he overpowered them very badly. These champs held. Also in the B&C LSI data, that shiz was worked past 20mm one way excursion, reaching about 200 degrees temp (Al hates anything above 170 degrees) and it held.
So, while there obviously IS higher risk of wear and issues with CCAW, it seems to be better controlled nowadays.
That's also where my setup kicks in. Avoiding the impedance valley, causing it to not eat as much power, not to heat up that much, and cool down with more excursion. These speakers might be safer in my application hopefully.
Time will tell, this is different on model to model basis. I would love to have this in copper, but they don't make em in the parameters set I need.
Got the echo from the local seller, who has em preordered quite some time already. These will be available on february at soonest.
I ordered something to have at least some good stuff in my life, and every single company that has some feasible product seems to be denying it to me. Ouch. I will be unbearable. More echochamber buzz, more new decisions to make about that.
I ordered something to have at least some good stuff in my life, and every single company that has some feasible product seems to be denying it to me. Ouch. I will be unbearable. More echochamber buzz, more new decisions to make about that.
I'm sure the CCAW technology has advanced over the years. It definitely is better than it used to be from a durability standpoint. My biggest gripes with it is parameter change and fatigue annealing.
Soldering it reliably to copper is also rather difficult. Special flux is needed for this unless you can cold weld it. Every abused LF driver I've reconed or repaired with CCA windings had some form of aluminium fatigue. Its even worse when a polyimide or Kapton former is used in combination.
Seas and ScanSpeak had a few issues with lead wire to VC termination associated with hidden corrosion, causing open VCs. This was the case with some rather expensive drivers. Its not so much a problem with HF drivers, where there isn't as much mechanical strain or flex.
Soldering it reliably to copper is also rather difficult. Special flux is needed for this unless you can cold weld it. Every abused LF driver I've reconed or repaired with CCA windings had some form of aluminium fatigue. Its even worse when a polyimide or Kapton former is used in combination.
Seas and ScanSpeak had a few issues with lead wire to VC termination associated with hidden corrosion, causing open VCs. This was the case with some rather expensive drivers. Its not so much a problem with HF drivers, where there isn't as much mechanical strain or flex.
Didn't chicken out. One piece of LN19S450 that I ordered, was scheduled to arrive about now at TLHP. Though the order update says it will be delayed, and next batch (which can be my batch as well unfortunately, because who knows) is scheduled for about March. So RCF releases a driver and it is not available for whole year. Shame on them.
LN16S400 seems to have similar fate, coming just little sooner, and LN19S400 is available at TLHP, even locally in Czech Rep. One piece marked as opened box is available at ebay for discounted price. It is tempting to just get it for measurements and resell it for additional ~$50 discount...
Damnit.
LN16S400 seems to have similar fate, coming just little sooner, and LN19S400 is available at TLHP, even locally in Czech Rep. One piece marked as opened box is available at ebay for discounted price. It is tempting to just get it for measurements and resell it for additional ~$50 discount...
Damnit.
So, there goes the first TLHP RCF LN driver?
https://www.ebay.com/itm/226459919110
It's tempting to just get it and resell soon, but it is the least interesting one from the trio.
The (ordered) LN19S450 is being delayed again and again. I am patient though. Only thing that would break me is probably new competition.
Looking at drawings, these LN drivers have yet even smaller venting cross sectional area. I wonder how noisy will they be at the large excursions they provide. Contemplating on making some long video about these when I get my paws on it.
https://www.ebay.com/itm/226459919110
It's tempting to just get it and resell soon, but it is the least interesting one from the trio.
The (ordered) LN19S450 is being delayed again and again. I am patient though. Only thing that would break me is probably new competition.
Looking at drawings, these LN drivers have yet even smaller venting cross sectional area. I wonder how noisy will they be at the large excursions they provide. Contemplating on making some long video about these when I get my paws on it.