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Considering First Amp Build
Considering First Amp Build
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Old 24th January 2019, 02:39 AM   #11
GAAudioLVR is offline GAAudioLVR
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Thanks for the suggestions. Can someone give me a simple explanation of the differences in the F6, M2, and F5?
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Old 24th January 2019, 03:00 AM   #12
twitchie is offline twitchie  Canada
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Considering First Amp Build
Triton Reference no less!

Quote:
Originally Posted by Dennis Hui View Post
I'm pretty sure most FW designs will have enough power. For example, I've
seen a local dealership demo Tritons with a FW SIT3.
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Old 24th January 2019, 05:04 AM   #13
Dudeisms is offline Dudeisms  United States
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Originally Posted by GAAudioLVR View Post
Thanks for the suggestions. Can someone give me a simple explanation of the differences in the F6, M2, and F5?
Here’s a great start to an answer Sound of various Pass amps

Check out the articles and manuals on FirstWatt.com
Also check out the articles on 6moons.com
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Old 24th January 2019, 10:52 AM   #14
plasnu is offline plasnu  United States
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Everyone plays music at different level, so I would recommend to measure the output voltage with current setup. This is what I do.

1. Playback pop music from a computer as loud as I want to.
2. Disconnect speakers and connect an appropriate resistor, then playback 0dB 100-1000Hz sine wave.
3. Measure output voltage of the amp.
5. Vrms*Speaker Impedance is the required max amplifier wattage.

If no computer, you can download 0dB test tone from internet, and burn CDR, or you can use your smartphone. I think you'll probably be surprised to find you only really need much lower wattage than what you are guessing.

Last edited by plasnu; 24th January 2019 at 11:12 AM.
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Old 24th January 2019, 01:06 PM   #15
Russellc is offline Russellc  United States
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Considering First Amp Build
F5 is very transparent, if your speaker tends towards the thin side, might not help as that will come straight through. I found F6 in same vein, really liked F5 better. I liked M2 better than both. Warm, organic with very nice imaging. Also consider Aleph J. In similar vein as M2, single ended, very nice.

For your high mid of 92 dB efficiency, consider Sissy Sit from Zenmod.

Russellc
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Old 26th January 2019, 01:20 PM   #16
6L6 is online now 6L6  United States
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Considering First Amp Build
Because your speakers have powered subwoofers, and the rest of them are quite efficient, there's really no wrong answer. You would be amazed with the little ACA, but a little bigger will get you into enough power to listen too loud when you want to turn it up.

25W of real Class-A is a fantastic and wonderful ear-opening experience, not just for the absolute superiority of the sonic qualities, but because Class-A watts absolutely feel 'bigger'. Dynamics, articulation, finesse, and overall musical qualities are all better in class-A. Aside from the inherent advantages of that much bias in the output devices, it has much to do with clipping behaviors and that the power supplies are insanely big compared to the power output.

Anyway, my standard list of amp suggestions, in order,
Aleph J, M2x, BA-3, F5

But more importantly, look around, and build the amp you find most interesting or intriguing first, since nobody builds just one....


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Old 26th January 2019, 02:14 PM   #17
GAAudioLVR is offline GAAudioLVR
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6L6 and everyone, thank you for your responses. Looking at all the options can be a bit overwhelming when you cannot listen to any of the amp designs.

The Aleph J was the one, after the ACA, that caught my eye and will likely be the one to start but with there being so many amps with the same wattage specs, it's hard to know the differences and how they will sound.

Ideally, I am looking to buy a Pass Labs XA30.8 at some point. Will the Aleph J or another amp in the DIY store have a similar sound?

Also, the JFETS have been out of stock for quite some time. Where can I buy them? I keep reading about counterfeits and I have no way to tell which ones are legit. Thanks again.
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Old 26th January 2019, 08:23 PM   #18
Russellc is offline Russellc  United States
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Maybe in some ways, but it is a different beast altogether. Here is a 6moons review that compared XA30.8 to F6 and One of the SIT amps, maybe it will answer a few questions.

6moons audioreviews: Pass Labs XA30.8

That said, you will enjoy Aleph J regardless.....

Russellc
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Old 27th January 2019, 01:02 AM   #19
Itsmee is online now Itsmee  England
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Considering First Amp Build
BA2 is always an option.

I don't see it in your signiture Jim.
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Old 27th January 2019, 02:03 AM   #20
GAAudioLVR is offline GAAudioLVR
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Originally Posted by Itsmee View Post
BA2 is always an option.

I don't see it in your signiture Jim.
Oh great, another amp to consider.

I'll have to look it up.
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