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Build Thread: ACG Finn 5 (the Wal killer)

My bass is just about done in finishing and assembly is about to start. John East is hopefully giving Alan the interface boards in the next few days and then it will be completed and ready to ship my way.

:bassist::bassist::bassist:

Oh, and here's a shot of the underside of the new multicoil pickups.

I'm expecting amazing things and I'm quite sure I won't be disappointed.

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:eek::eek::eek::eek::eek::eek::eek::eek:
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Yeah, pretty cool to see how much goes into these things.

I do believe the circuitry on the bottom is the interface board which acts to mix the signals since each string has two coils and works as a separate humbucker.

An explanation from Alan, taken from the ACG website:

The MC Series Multi-Coil Pickups have two coils per string. In a 4 string pickup there are 8 poles, 2 per string, where each pair of coils is wired in series as a humbucker. In other words each string has its own dual coil humbucking pickup.

The individual outputs from each string feed an ACG IB1 interface board, which mixes them electronically. The multiple coils and electronic mixing reduces the interaction between the strings coil signals, since there is no cross-feeding between string signals as with traditional pickups, where the same magnet systems and coils are used for all strings.
This leads to improved dynamics and far greater clarity over the entire range of the bass.

There are two versions of the IB1 interface board. The IB1f version has a ‘flat’ audio response where the natural response of the pickup is left intact and would normally be paired with a neck pickup. The IB1r version has interactive pickup resonance in the upper presence region which gives rise to greater clarity, particularly with fingers style. The IB1r would normally be paired with the bridge pickup.

We believe that our MC Series pickups offer you the most sonic versatility and clarity possible, in conjunction with our ACG EQ03 every possible subtlety and nuance is present and there to be played with.
 
Having now played a few basses with the MC pickups I am very pleased with them. They are very clear and articulate across the entire range of the board. Although the pickups are relatively close to each other the use of the two different interface boards gives a significant difference sound wise between the two pickups.
 
One more picture:

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Having now played a few basses with the MC pickups I am very pleased with them. They are very clear and articulate across the entire range of the board. Although the pickups are relatively close to each other the use of the two different interface boards gives a significant difference sound wise between the two pickups.

Very nice Alan. Quite frankly, my experience with filter preamps in general and the ACG EQ series in particular is that I'd rather have the bass be more midranged focused when set flat since it's very easy to cut those frequencies with a LPF if need be.

Wow. Beautiful. Can't wait for the sound clips!

Will do. With ACGs soundclips can be a bit misleading just because of the enormous range of tones that can be dialed in. I do believe the bass has a passive mode (which still requires a 9V due to the interface board) so I'll probably start there. Then I'll do some clips with the preamp set "flat" (both LPFs open all the way with no overshoot peak), high pass filter set to pass all highs with no boost) moving between the neck pickup soloed, both blended equally and the bridge pickup soloed. After that I'll just dial in a few tones I like and maybe take some requests as otherwise I could spend months making clips and not cover all the permutations.
 
The other thing to remember if you have used a Wal is that the lowpass filter cut of frequency is a lot higher than on the Wal pre-amp. So with the filter fully open you are letting a lot of frequencies through that the Wal does not, even more so if you use the highpass as well. While this does make the bass feel less mid focused it also opens up a range of sounds not possible with the Wal. The two mid boosts do help to offset this. I found my self setting the filter where I used to set them on the Wal and the sound was brighter than I wanted so it was a case of closing down the filter a bit further to get the desired effect. With the Wal I also have the boost switched in all the time but with 03 I find I never really go above the dente with the boost.
 
It can be a problem but the idea behind the basses is to allow the player to find their sound with the instrument. But in turn it can make getting a representative selection of sounds a bit of a pain.

Personally I found that it just required a change in thinking about EQ.

In fact I like the ACG EQ03 so much that I don't own a bass with any other preamp. All my others are passive.

The filter pre takes some getting used to but it opens up a whole world of sounds as opposed to subtle EQ changes that honestly I'd rather make via my amp anyway.

And you're right about the ACG preamp having more range than the Wal. To me there's no downside to having more versatility. In addition to the LPFs having a wide range where the Wal preamp has the "pick attack" which is set treble boost of a narrow frequency band (I believe) the ACG has complete control over the HPF and the amount of boost you give it.

Add in the tone control so that you can take the edge off a bit if need be and the two mid boosts and I can't think of a more versatile preamp.

Alan, is the bass currently strung up B-G or E-C?
 
I am spending a lot more time actually playing at the moment because for the first time ever I have managed to build a couple of basses that I intend to keep and have actually kept them. I have even managed to turn down the chance to sell the Krell prototype which is a first for me. So I am getting to know the pre-amp a lot better myself. I have always understood that people find it confusing and a lot to get your head round but I still believe that the range of sounds are worth the effort and that the filters allow you to get sounds that a standard cut/boost pre-amp can't get. But I still only use 40% of what it can do because that is the sound I like. You may use a different 40%from me but the only way to have both is to have a high degree of flexibility to start with. Some people like that others don't. For those that don't try the SEQ.

Strung E-C.
Alan
 
I am spending a lot more time actually playing at the moment because for the first time ever I have managed to build a couple of basses that I intend to keep and have actually kept them. I have even managed to turn down the chance to sell the Krell prototype which is a first for me. So I am getting to know the pre-amp a lot better myself. I have always understood that people find it confusing and a lot to get your head round but I still believe that the range of sounds are worth the effort and that the filters allow you to get sounds that a standard cut/boost pre-amp can't get. But I still only use 40% of what it can do because that is the sound I like. You may use a different 40%from me but the only way to have both is to have a high degree of flexibility to start with. Some people like that others don't. For those that don't try the SEQ.

Two things on this. One is that just like any other bass with a preamp, the biggest thing is that the bass sound good set flat before tweaking anything. And experience tells me this one will sound great flat.

The other is that I think that if people get introduced to the ACG preamp in the right way that it makes all the difference.

To me it's about learning the sounds of the bass set flat, adjusting the mid boosts where you want them and then focusing on ONE pickup and the changes the bass stack can have. Then bring in the treble stack and then finally tune both pickups and start blending them.

Strung E-C.

Perfect.
 
After a significant amount of shedding, I can positively conclude that this bass is incredible.

The ACG/East preamp has a lot more range in its LPF stacks than Wals do. Open all the way the ACG passes frequencies up to 7kHz. I believe Wals only pass frequencies up to 3 kHz. So to cop Wal tones I have to dial the low pass filter knobs back significantly. But those tones are definitely there. As are super clean, yet authoritative hi-fi sounds with the LPFs all the way open.

As I told Alan, this bass with the multicoil pickups is much more distinct whereas ACGs with the single coil or standard humbuckers are much more of a blank slate where you can use the preamp to cop tons of tones. From jazzes to Pbasses to Stingrays to Rics I could get pretty close without much effort.

But the MC pickups have their own vibe and give this bass much more of a signature sound.

The obvious solution is that everyone should buy two ACGs.

Seriously, Alan is cranking out amazing instruments that more people need to check out.

Any interest in some sound clips?
 
Interest in sound clips? Definitely.

That is a gorgeous top and a very pleasing execution of the singlecut shape. I really like it aesthetically (I like the hint of Jazz Bass in the lower bouts) and it looks like it would balance well.

Not to derail, but is the painting to the left of the ACG inspired by the Stambaugh to the right?

And, again at the risk of derailing, a question for Alan: The way I hold my left hand in the high registers makes me prefer a very deep cutaway -- one that goes slightly past the last fret. Is it possible to execute this body shape with such a cutaway without compromising seated playing position? Maybe the lower horn would have to be modified...

Back on track: Am interested to hear how well this bass cops some of the classic Wal tones (I think I mentioned early Flea+Wal, if not in this thread then another concerning this pre) as well as its "own" sounds. If you have a single-coil loaded ACG, some comparisons with that would be cool as well, though I realize that might be asking a bit much.

Am interested in how clearly harmonics (think the intro to Portrait of Tracy) come across with the multicoils in different positions as compared to single coils.

Congrats to the builder and the player on a beautiful bass.