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Which preamp for Amp Camp?
Which preamp for Amp Camp?
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Old 15th July 2017, 11:07 AM   #11
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by Skylar88 View Post
Ah, ok.
I still have to make the connection between dB and the input sensitivity of an amp. Electronics, and audio in particular, has not been my field of expertise. But I'm learning fast...

Christo
Amp starts clipping around 8V peak by gain of 5.
8 5 = 1.6V peak input
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Old 15th July 2017, 11:38 AM   #12
ColinA123 is offline ColinA123  United Kingdom
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IMHO the best pre-amp is no pre amp!
Try just a passive pre, this can be just a pot in a box or stepped attenuator (plenty to try on E-bay) up to transformer volume control.
If needed use a buffer like the B1
Keep it simple!
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Old 15th July 2017, 11:57 AM   #13
Zen Mod is offline Zen Mod  Serbia
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Which preamp for Amp Camp?
Iron Pre from Store

when is available
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Old 15th July 2017, 12:07 PM   #14
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by AndrewT View Post
Try with just a Buffer instead of a pre-amplifier.

Add the Buffer after the vol pot and then run the buffer output cable to the power amplifiers.

You may find that you get sufficient volume for all except a drunken party night.

Buffers can be ultra cheap (at least at this testing stage) by using a unity gain dual opamp or two PassB1 channels.
Don't add on a case/ enclosure until after you know what you finally need.

Man... this is the kind of information I'm after, Thank you so much!

Stuff like "unity gain dual opamp"is way over my head, but like I said in a previous post, I'm learning fast! And I might just be able to extract and use "two Pass B1 channels", although a diagram would be much easier to work from.

Christo
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Old 15th July 2017, 12:10 PM   #15
Skylar88 is offline Skylar88  South Africa
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Originally Posted by AndrewT View Post
double power is +3dB
ten times power is +10dB...

Thanks for the explanation. It will help me tremendously!
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Old 15th July 2017, 12:21 PM   #16
Skylar88 is offline Skylar88  South Africa
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Originally Posted by koja View Post
I will be using Juma's bf862-based preamp (channels tested long time ago but still waiting for me to put it all together with a volume attenuator, since I do not need it 90% of the time). the preamp has ~8dB Vgain.

Nice! Thanks Koja, more options.

So, according to my newly discovered dB calculator, 8dB = 2.51 voltage gain and 6.31 times the power. Dang! I think I'm getting the hang of it now.

Christo
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Old 15th July 2017, 12:22 PM   #17
Attila I is offline Attila I  Germany
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Default AmpCampAmp & TangBand???

@Skylar88
You should keep in mind that those speakers have low efficiency 90dB or less.
So with ACA you might not reach desired listening levels. With a preamp you will only drive into distortion.
Check needed voltage for your speakers (there's a thread somewhere here).
cheers
A.
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Old 15th July 2017, 12:33 PM   #18
2 picoDumbs is offline 2 picoDumbs  Australia
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90dB is certainly ok for a bedroom, but maybe not for a large entertaining area.
Really depends how loud you listen to music.
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Last edited by 2 picoDumbs; 15th July 2017 at 12:36 PM.
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Old 15th July 2017, 12:57 PM   #19
Skylar88 is offline Skylar88  South Africa
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Thanks, you guys are great! Without your help it would surely have been a disaster.

So, if I might ask, what kind and size drivers should I be looking at for a good listening experience in a medium sized lounge? I just want to enjoy good quality HiFi sound at decent levels. It's not for parties at all. That's not my style!

From what I've read, the ACA's is powerful enough for my need.

Christo
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Old 15th July 2017, 02:28 PM   #20
AndrewT is offline AndrewT  Scotland
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the now unfashionable 8" mid bass and 1" treble does nicely.
It was designed to be cheap but still gives very acceptable performance.

You can go down to a 5" or 6" mid bass, but this limits the low bass too much for many. However it may give a cleaner upper mid and a nicer cross from mid to treble.
That could be enough to make it seem better than an 8".

If you go for a reasonably efficient 6"+1" because you like the upper bass, mid and treble, you can at some later date add in a low bass only speaker and amplifier.
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