FYI - here's what I think is true. You may not need three. Two are for balanced output the ones closest to the balanced connections. The other one is for conversion of balance to line out (RCA) - that is what my research seems to say. I bought two opa828 because I use this in balance mode. I will try this and find out if this is correct.
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If by "trying out" you mean sighted and uncontrolled listening - you won't find anything out that has any validity.
Please see this thread - you should move all discussions of op amp rolling there. That is what it is for.
Serious Question: How can Op Amp rolling improve the sound of an already well measuring device? Are that many confused? (Master Thread)
On OP-Amps and Op-amp rolling Another contentious topic. Manufacturers of DACs and Amps often socket op-amps to allow people to swap them with different types, with the aim of improving the sound - or getting a different “sound signature” (Whatever that might mean to you). We get it. It’s...
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max_headroom
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Is nobody talking about the stepped volume control with the NJW1195A chip? That's a surprising feature in this class of amp. Correct me if I'm wrong but do these chips not provide better channel matching and noise performance than pots?
Bought one and dropped it in the high section of my actively triamped system. I like it. Seems better than my aged Phase Linear PL300 amp. Allows me to update the old girl amp with new caps and opamp.
It comes only with the 5 amp power supply so I ordered a 10 amp block from ebay as I will need near full ouput at times. Will be a good competition between the two when completed.
It comes only with the 5 amp power supply so I ordered a 10 amp block from ebay as I will need near full ouput at times. Will be a good competition between the two when completed.
Schlippwhip68
Addicted to Fun and Learning
Give it a go! I use the opa828 in the T20 not the A20. I have the ceramic Burr Brown opa2604 in the A20 and that combo punches like Tyson Fury on Meth! Excellent dynamics. Great choice for EDM, Electro, Hip Hop, Reggae, Rock etc, big bold sound. Let’s not though as others have said get into the op amp discussion as there is a thread for that elsewhere on the site.
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What 10amp supply did you buy?
Bought this used one for 25 bucks. Trying to save a buck and get a heavy duty style one. The Aiyia branded one was around 80 bucks. This one appears to be a linear PS. We shall see.
That is a switch mode supply - not linear.
Schlippwhip68
Addicted to Fun and Learning
Put two of these between your power supply and the A20 and you will hear a big enough difference to justify the smallish outlay. Use the upgrade cable 20cm between the two filters and up to 0.75m from the second filter to the amp. I very much am enjoying this upgrade with Aiyima’s 36v 6a power supply. The cable is 16awg and is comfortable up to 10amps, does not even get warm with the 36v.
Fosi Audio DC Power Filter Eliminates High-Frequency Noise With V3 MONO
Hifi Occ Silver Plated 12V DC 2.5-2.1 mm Plug Power Cable Connector Male To Male Cord Adapter for Keces Linear Extension DC Wire
Fosi Audio DC Power Filter Eliminates High-Frequency Noise With V3 MONO
Hifi Occ Silver Plated 12V DC 2.5-2.1 mm Plug Power Cable Connector Male To Male Cord Adapter for Keces Linear Extension DC Wire
Ok, thanks. Hopefully it does all that I need without issue.
That filter was specificalluy designed for when you are powering two V3 Monos from a single supply, to prevent the non synced switching frequencies from "beating" via the power supply. It won't do anything audible in a single PSU to single amp situation.
Sorry that just warrants a
You seem to just gullibly accept any flowery, evidence free description of any product as an "upgrade"
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Schlippwhip68
Addicted to Fun and Learning
Oh dear, looks like I will just have to live with my blacker background, better defined mid and sub bass with cleaner all round sound by my self then…oh well.That filter was specificalluy designed for when you are powering two V3 Monos from a single supply, to prevent the non synced switching frequencies from "beating" via the power supply. It won't do anything audible in a single PSU to single amp situation.
Sorry that just warrants a
You seem to just gullibly accept any flowery, evidence free description of any product as an "upgrade"
Feel free to continue deluding yourself, if that is what makes you happy.
Please though - stop trying to delude others here. There are many forums where that sort of nonsense is welcomed. It would be very much appreciated - if you cant drop it - were you to take it to one of those.
This, here, is not the place. You've been here long enough to know that.
Schlippwhip68
Addicted to Fun and Learning
I think I will just ignore you now mate if you don’t mind. You have gone to far accusing me of deluding people, that is slanderous. I am not here to lie and post fake results and the results I have heard are very much real and yes I understand everyone would prefer uber tests to prove everything or at least get a machine to support their claims but that is not always possible and I am not selling or forcing anyone to buy anything, it shared experience and actually free of charge!
The DC filter does have a positive effect on the sound quality folks and are designed for single as well as plural usage, you can verify this with Fosi Audio themselves so ‘antcollinet’ needs to please do his/her homework before they comment next time.
It's not slander if it is true. When you tell people something makes a difference to the sound when there is no physical mechanism for it to do to so - that is peddling misinformation. You are literally deluding people.
Your statements sound (to anyone who understands the engineering and physics) exactly like "Look - I've painted the wheels on my car white - now it can fly"
You've had the reasons why you can percieve differences that don't exist in the sound explained - over and over again. Yet you refuse to engage with that aspect of science and continue to make your nonsense statements. I don't deny your perceptions are very much real. It is just the reason for them that you are wrong about.
I even provided you with a video demonstrating one example of how your percptions can be changed - a very well understood and documented psychoacoustic phenomena (The Mcgurk effect). You dismissed it as "a brainwash"
Fosi also sell devices with replaceable op amps - they make no difference either. This is just another example of your credulity in believing what people trying to sell you something say.
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ziggurcat
Addicted to Fun and Learning
Assuming you mean the NC252MP, without any proper measurements of the A20, I don't think anyone can definitively say which one would be "better." It also might depend on your use case, too. For example, I definitely would not use the Buckeye for a desktop computer system as that might be overkill for me.
JSmith
Master Contributor
Good plan. That statement about "fitting" your speakers is nonsense.
Assuming this amp performs well enough to be in the "sounds the same as other amps when operated in the power envelope" (It probably will), then there will be no audible difference between this amp, and the 252MP, then the only audible impact will be in what that power rating is.
1% distortion power rating figures:
252MP
About 150W at 8ohm, 250W at 4ohm.
This amp - with 10A supply:
150W at 8ohm, 250W at 4ohm
(100W/120W with the 5A supply)
10A supply adds £$35 to the cost.
(All power ratings need independent validation here)
So power rating basically the same - if you use the 10A supply I would expect there to be no audible difference - even when you push the volume.
This amp has a lot of valuable features (balanced inputs, high pass filter, trigger inputs, sub output) that 252MP based amps may lack. A disadvantage may be the external power brick.
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