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Markaudio 12P plus ACA amp
Markaudio 12P plus ACA amp
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Old 22nd August 2018, 11:23 AM   #1
Ugg10 is offline Ugg10  United Kingdom
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Default Markaudio 12P plus ACA amp

Quick Questions -

Will the Amp Camp Amp class A amp (8w) drive the 12P in either a Pensil or a Marken box. Will I need to mono (15w) the amps to get the best sound ?

Not looking for concert levels but for decent sound level in a small ish (10ft x 10ft) room.

Thanks in advance.
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Old 22nd August 2018, 01:46 PM   #2
Scottmoose is offline Scottmoose  United Kingdom
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Quote:
Originally Posted by Ugg10 View Post
Will the Amp Camp Amp class A amp (8w) drive the 12P in either a Pensil or a Marken box.
Yes, you should be fine. For the most part they'll be ticking over (well, a little more, but not excessive based on what you say about levels)

Quote:
Will I need to mono (15w) the amps to get the best sound?
'Best' is a floating point that varies depending on what the individual means by it, so to a point YMMV. You won't need to to drive them; you may get some improvements by running as monoblocks however, so if you can afford to do so, it sounds like a good qualitative option to me.
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Old 22nd August 2018, 02:57 PM   #3
Ugg10 is offline Ugg10  United Kingdom
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thanks @scottmoose, much appreciated. Don't suppose you know if you can get just he circuit boards in the UK as importing the basic kit make it a very expensive bag of parts ($119 + P&P $25?) / 1.3 [exchange] * 1.2 [vat] = £132.

My only other option is to hard wire on a board ???

I know there are Chinese ripoffs but would prefer obviously to use an authorised route.
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Old 22nd August 2018, 03:02 PM   #4
twocents is offline twocents  South Africa
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Markaudio 12P plus ACA amp
Quote:
Originally Posted by Ugg10 View Post
Don't suppose you know if you can get just he circuit boards in the UK as importing the basic kit make it a very expensive bag of parts ($119 + P&P $25?) / 1.3 [exchange] * 1.2 [vat] = £132.
Try Jean-Pierre in Germany - I am sure he can help you:
My first GB
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Old 22nd August 2018, 03:07 PM   #5
GASCo is offline GASCo  United States
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For what itís worth, Nelson himself doesnít care where the boards are coming from if you need help and assistance of the forum. Itís an open design after all.

Iím with you that would be great to support the forum but unfortunately there is no bare pcbs available for a while.

Just be careful that the Chinese pcbs are not a perfect copy. You need to change a couple things based on the schematic they use, missing one cap and r15, god knows why...
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Old 22nd August 2018, 08:24 PM   #6
toobhed is offline toobhed  United States
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I really enjoy the combination of my old ACA (5w, 19vdc PS) and my regular (not super) MA 12p Pensils. My room is larger than what you indicate and there is no problem with volume or headroom. They're a great combo, go for it!

Mario
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Old 22nd August 2018, 08:57 PM   #7
Ugg10 is offline Ugg10  United Kingdom
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Many thanks @toobhed, what was the bass like, not expecting it to shake the foundations, any idea how low it went and was it tight/loose/wholly/ any other adjective you can use to describe it?
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Old 22nd August 2018, 10:02 PM   #8
toobhed is offline toobhed  United States
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Subjectively, the bass was just fine....and very adjustable depending upon the amount of stuffing used, how close the speaker is spaced to the back wall, etc. Not as tight of bass as a good two-way's woofer, but a far better sounding speaker than many many two-ways. The highs are outstanding for a cone this size and with very little beaming...to be sure a great cabinet design by Scott...and easy to build.

I recall ending up with somewhat less stuffing than the original recommended starting point from the plans. I know others may differ, but I find the 12P about perfect for my tastes, not as detailed as my MA-A7m Pensils, but more efficient and a bigger (more air moved) sound.

...just go for it and build!

Mario
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Old 22nd August 2018, 10:10 PM   #9
planet10 is offline planet10  Canada
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Markaudio 12P plus ACA amp
From the many months i spent with the original ACA & A10p Mar-Ken (which give up a dB to A12p) in my large room (24x36 with a 27 ft peaked ceiling — ≈ 250 m3 if you are not trying for concert levels you will be fine,

dave
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Old 23rd August 2018, 01:49 PM   #10
xrk971 is offline xrk971  United States
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Markaudio 12P plus ACA amp
You might try an Alpha 20 amp - 20w and also SE Class A but no unobtanium 2sk170’s needed. Alpha 20 is a true “zero adjustment” Class A DC-coupled output amp.

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