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Amp Camp Amp Kit V1.6
Amp Camp Amp Kit V1.6
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Old 15th January 2019, 12:54 AM   #401
FogAudio is offline FogAudio
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Join Date: May 2012
Quote:
Originally Posted by wcwc View Post
Did you re-run Audessey in the Marantz when you added the amps?
No, I didn't rerun Audessey but that is definitely something that I can try. I'll give that a shot in a couple of weekends from now... sadly that is probably the next opportunity I'll have to do some playing around with everything. Thanks for the suggestion.
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Old 15th January 2019, 12:56 AM   #402
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Originally Posted by Mooly View Post
Altering R12 will prove one way or the other whether the preamp is struggling as altering this resistor will not alter the input impedance.

Definitely worth trying that first.
I am going to try the Audessey thing and if that doesn't work I will try changing R12 on one of the amps. Either way I'll report back when I can!
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Old 15th January 2019, 02:40 AM   #403
wcwc is offline wcwc  United States
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Fog,

Are you using XLR in or RCA bridged mono? Your speakers are 4ohm, so RCA paralleled mono would be the way to go.
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Old Today, 01:10 AM   #404
Sidsmith is offline Sidsmith
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Originally Posted by Alan4411 View Post
Yes from what we can see everything is installed ok.
Go to the build guide, Amp Camp Amp V1.6 Build Guide - diyAudio Guides
and see Step 56 ''Troubleshooting''.

Do the resistance and voltage checks and let us know the results, please.
Here is the measure :
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Old Today, 03:11 AM   #405
FogAudio is offline FogAudio
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Quote:
Originally Posted by wcwc View Post
Fog,

Are you using XLR in or RCA bridged mono? Your speakers are 4ohm, so RCA paralleled mono would be the way to go.
I was using XLR when testing with the Marantz. Funnily enough when I was getting decent volume on my small bookshelf speakers, I had it in bridged SE RCA mode (but just driven from a phone). Should I expect another 3dB of gain by switching to RCA bridged?!

Last edited by FogAudio; Today at 03:33 AM. Reason: replaced better gain with decent volume for clarity
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Old Today, 03:24 AM   #406
6L6 is offline 6L6  United States
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Amp Camp Amp Kit V1.6
Bridged is +6db gain from normal.

Parallel is no additional gain.
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Old Today, 03:30 AM   #407
FogAudio is offline FogAudio
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Originally Posted by FogAudio View Post
I was using XLR when testing with the Marantz. Funnily enough when I was getting better gain on my small bookshelf speakers, I had it in bridged SE RCA mode (but just driven from a phone). Should I expect another 3dB of gain by switching to RCA bridged?!
I just rechecked the ACA Operation Modes page and it seems to imply that I would only get 5 Watts of power out to 4 ohms in XLR mode, but 16 Watts out in parallel mono!? It sounds like that may be the best approach for me. Looks like I also double my damping factor which could potentially tighten up my bass. But wondering how much noise and distortion will suffer as a result. Is the expectation that those are doubled as well?
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Old Today, 09:52 AM   #408
Alan4411 is online now Alan4411  Wales
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Quote:
Originally Posted by Sidsmith View Post
Here is the measure :
Start by checking R7.
Top right hand corner and should be 10k ohms.
You have 24 volts one side of it (from Q2 D) and only 2.8 volts on the other (Q3 c).

It could be high resistance / open circuit or not soldered in properly.
Take a resistance reading, meter on 20k ohms, from the top of R5 to the D pin of Q2. It should read nearly 10k ohms after a few seconds.
Alan
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