I'm pretty sure (although, I could certainly be wrong) that the DC resistance would/should be less than 4 Ohms... the value of the series resistor in the high pass filter paralleled with the mid drivers.Bruce Weldy wrote: ↑Sun Apr 11, 2021 12:34 pm Went back and tried the 2k ohms setting and it showed .001 - so it definitely uses the scale as it rounded up from .8 at the 200 scale to register .001 at the 2k scale......so, it looks like 8 ohms is correct.
Thought I'd try another test. Put on some music and ran it through the Yamaha. I was able to take it all the way to 10 with no problem. Same song, just switched over to the SLA and it crapped out again.
Pretty sure something is wrong in the cab that's cratering the amp.......looking for suggestions. And once again.....it sounds great at lower volumes.
SLA Pro - Powered
Re: SLA Pro - Powered
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
What reading do you get if you test the other speaker?
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
I'm fairly certain you're reading a little less than 1 ohm. 0.001 kOhm is 1 ohmBruce Weldy wrote: ↑Sun Apr 11, 2021 12:34 pm Went back and tried the 2k ohms setting and it showed .001 - so it definitely uses the scale as it rounded up from .8 at the 200 scale to register .001 at the 2k scale......so, it looks like 8 ohms is correct.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
Shot in the dark guess is the Capacitor is faulty.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
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- Posts: 8301
- Joined: Fri Nov 27, 2009 11:37 am
- Location: New Braunfels, TX
Re: SLA Pro - Powered
Dammit Seth, would you quit asking intelligent, pertinent questions?
It tested out at 6.5 - so, you are right. So, I guess that means that somehow I'm getting a really low impedance from the speaker array.
Damn, it's gonna' be a PITA to take the amp out so I can get to the high pass filter to be able to test the speakers without the filter engaged to see what they say. Then I can test the tweeter array and see what it is....
Not sure that will happen today . The Masters is finishing up and after three gigs in three nights - I plan to watch/nap through the golf tournament.
Seth, thanks for telling me to do the things I should have already done myself.....I'm usually better than this at trouble shooting. Geez......
6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210
"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."
- Bill Fitzmaurice
- Site Admin
- Posts: 28620
- Joined: Tue May 02, 2006 5:59 pm
Re: SLA Pro - Powered
It does point to a too low impedance load, but I don't see how that could be. I don't recall how you're running it and don't want to search the entire thread, is it bi-amping just the SLA? If it's the tweeter high pass at fault one explanation is if the 30 ohm resistor isn't connected at one end. Without that connected at both ends the filter would present about a 1 ohm load to the amp at 5kHz.
Re: SLA Pro - Powered
Just pull the bottom driver...Bruce Weldy wrote: ↑Sun Apr 11, 2021 1:04 pm
Dammit Seth, would you quit asking intelligent, pertinent questions?
It tested out at 6.5 - so, you are right. So, I guess that means that somehow I'm getting a really low impedance from the speaker array.
Damn, it's gonna' be a PITA to take the amp out so I can get to the high pass filter to be able to test the speakers without the filter engaged to see what they say. Then I can test the tweeter array and see what it is....
Not sure that will happen today . The Masters is finishing up and after three gigs in three nights - I plan to watch/nap through the golf tournament.
Seth, thanks for telling me to do the things I should have already done myself.....I'm usually better than this at trouble shooting. Geez......
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
- Bill Fitzmaurice
- Site Admin
- Posts: 28620
- Joined: Tue May 02, 2006 5:59 pm
Re: SLA Pro - Powered
That picture seems to show the coil connected to the wrong end of the cap.
Re: SLA Pro - Powered
I get the same way when it's my own problem, yet I'm dialed in when it's solving other peoples problems. It's a really weird thing. Glad to know I'm not the only one!Bruce Weldy wrote: ↑Sun Apr 11, 2021 1:04 pm Seth, thanks for telling me to do the things I should have already done myself.....I'm usually better than this at trouble shooting. Geez......
He's just using the full range channel in the amp. The high frequency amp output is not being utilized.Bill Fitzmaurice wrote: ↑Sun Apr 11, 2021 1:05 pm It does point to a too low impedance load, but I don't see how that could be. I don't recall how you're running it and don't want to search the entire thread, is it bi-amping just the SLA? If it's the tweeter high pass at fault one explanation is if the 30 ohm resistor isn't connected at one end. Without that connected at both ends the filter would present about a 1 ohm load to the amp at 5kHz.
Everything appears to be in order.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
Actually... the coil is on the wrong side of the capacitor, isn't it? Looks to me, that could very well be the issue.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: SLA Pro - Powered
Hah! Missed this post.Bill Fitzmaurice wrote: ↑Sun Apr 11, 2021 1:25 pm That picture seems to show the coil connected to the wrong end of the cap.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
- Bill Fitzmaurice
- Site Admin
- Posts: 28620
- Joined: Tue May 02, 2006 5:59 pm
Re: SLA Pro - Powered
I've lost track of who's cab that is, but if the coil is connected to the input side of the cap it's a miracle that it works at all.
Re: SLA Pro - Powered
Hear that Bruce?... you're miraculous!
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
-
- Posts: 8301
- Joined: Fri Nov 27, 2009 11:37 am
- Location: New Braunfels, TX
Re: SLA Pro - Powered
That's mine and it indeed looks like the coil is on the wrong side of the cap......how the hell did I do that?Bill Fitzmaurice wrote: ↑Sun Apr 11, 2021 1:54 pm I've lost track of who's cab that is, but if the coil is connected to the input side of the cap it's a miracle that it works at all.
Starting to feel like a real newb.......
6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210
"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."