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Old 22nd May 2018, 08:38 PM   #4431
Mooly is offline Mooly  United Kingdom
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Amp Camp Amp - ACA
A simulation shows the current changes very little, so yes it could be a measurement issue.

This is a composite image at near full output and then at a very low output. Supply current is being monitored.
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Old 22nd May 2018, 08:41 PM   #4432
clowkoy is offline clowkoy
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Thank you Zen Mod and Meper!
I was looking at a Hammond 187F20, 20 volts/5A. I guess it’s not enough.
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Old 22nd May 2018, 08:50 PM   #4433
Zen Mod is online now Zen Mod  Serbia
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Amp Camp Amp - ACA
it is

for one channel perfect

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Old 22nd May 2018, 09:09 PM   #4434
MEPER is offline MEPER  Denmark
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Quote:
Originally Posted by Mooly View Post
A simulation shows the current changes very little, so yes it could be a measurement issue.

This is a composite image at near full output and then at a very low output. Supply current is being monitored.

Ok.....I am quite sure now that the A-meters in the lap supply is not true RMS.....so they are good for DC only (maybe 50 Hz also). I need some more advanced to measure RMS current when it is AC.


At low frequencies (< 20 Hz) it also showed strange results…….I now know why…...
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Old 22nd May 2018, 09:16 PM   #4435
MEPER is offline MEPER  Denmark
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Originally Posted by clowkoy View Post
Thank you Zen Mod and Meper!
I was looking at a Hammond 187F20, 20 volts/5A. I guess it’s not enough.


When you design the PSU it is good to use the Duncan PSU designer II which is a free download program:
PSUD2


It is used much by "tube nerds".....the voltage drops over chokes etc. is not that easy to predict. The program can take parameters for the transformer, diodes in bridge etc. When the simulation is in place it is easy to e.g. change the load and see what happens….or change a capacitor…..or resistor.
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Old 23rd May 2018, 02:14 AM   #4436
clowkoy is offline clowkoy
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Thank you for the replies!
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Old 23rd May 2018, 01:09 PM   #4437
jklow888 is offline jklow888  Australia
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Re-posting from the ACA 1.6 thread as I haven't had a reply there and maybe owners with OB's can address my question:

Will the ACA have enough power to drive my parallel dual woofers on my open baffles ? The drivers in use are:

- 1 x 5" full range @ 92 dB 6.3 Ohms (Tang Band W5-2143)
- 2 x 15" woofers @ 100 dB 2.94 Ohms wired in parallel (Eminence Alpha 15's)

The XO varies from 100 - 225 using miniDSP HD but I plan to switch that out pending the Pass active XO kit being released.

Thanks !
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Old 23rd May 2018, 01:36 PM   #4438
Stanislav is offline Stanislav  Australia
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Quote:
Originally Posted by jklow888 View Post
Re-posting from the ACA 1.6 thread as I haven't had a reply there and maybe owners with OB's can address my question:

Will the ACA have enough power to drive my parallel dual woofers on my open baffles ? The drivers in use are:

- 1 x 5" full range @ 92 dB 6.3 Ohms (Tang Band W5-2143)
- 2 x 15" woofers @ 100 dB 2.94 Ohms wired in parallel (Eminence Alpha 15's)

The XO varies from 100 - 225 using miniDSP HD but I plan to switch that out pending the Pass active XO kit being released.

Thanks !
I think your woofers impedance is way too low for most amplifiers, not just ACA.
Maybe try to use one only as a woofer, or wire them in series, you have plenty of dBs there.
My best bet is you'll need a different amplifier.
I run an ACA with a 8 ohms 2 way, 10 inch FR plus a tweeter at 2kHz in an aperiodic box (total SPL approx. 94dB) and at times the bass control is a bit lacking.
Still nothing stops you from trying it.
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Old 23rd May 2018, 01:44 PM   #4439
Stanislav is offline Stanislav  Australia
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Quote:
Originally Posted by jklow888 View Post
Re-posting from the ACA 1.6 thread as I haven't had a reply there and maybe owners with OB's can address my question:

Will the ACA have enough power to drive my parallel dual woofers on my open baffles ? The drivers in use are:

- 1 x 5" full range @ 92 dB 6.3 Ohms (Tang Band W5-2143)
- 2 x 15" woofers @ 100 dB 2.94 Ohms wired in parallel (Eminence Alpha 15's)

The XO varies from 100 - 225 using miniDSP HD but I plan to switch that out pending the Pass active XO kit being released.

Thanks !
Or thinking a bit further, you'll definitely benefit from bi-amping.
ACA for the top, your full range, and something like F4 or BA-1/2 or M2 for the bottom.
Others may have other and better ideas.
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Old 23rd May 2018, 04:56 PM   #4440
chrisb is offline chrisb
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Or for a bit more grunt, a pair of bridged ACAs on the FRs and your favorite flavor of ballsy power for the woofers. For Schitts and giggles I just might try to get Dave to try a Hypex UcD180 in his WAW system once the rest of parts for ACA amp chassis arrive. (XLRs for balanced operations, and different binding posts)
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