Audible Illusions Modulus 3A an upgrade?

I'm using a Tube Audio Design TAD-150 signature series preamp with a Rogue Audio 90 power amp feeding a vintage pair of JBL 4311 speakers. I listen to mostly "classic rock" and blues.

I've been reading about how nice the AI Modulus 3A preamp is. Would it be considered an upgrade over my TAD-150?

Please forgive what might be an "ignorant" question from, but I am pretty much a "newbie" to high end audio.
thank you so much for your ideas.
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I wouldnt consider it an upgrade. Pretty much a sideways move or a downgrade.
The M3a is a lot better than people give it credit for being. It has been around a while but offers a high level of performance that I personally think is untouchable for the money used. It is a definite "Classic" for good reason. It is still being manufactured for a list of $2795. You can certainly spend a lot more and get a lot less.
I had the M3A but was significantly bettered by the Modwright 9.0SE in that same price range. It even beat out the CJ 17LS I owned as well, which I never expected. The 17LS was very pleasant, but the Modwright is much more resolving, dynamic, and the soundstaging wider and deeper. The M3A also is hard on tubes, and if you ever need service, you can kiss it goodbye for at least 2-3 months. (I had to have the attenuator changed because of noise)
I would keep the electronics and upgrade the speakers. The JBLs are a long way from high-end.
I'd suggest a used VTL Ultimate which is a better preamp than the Audible Illusions. The VTL can be fitted with an excellent tubed phono stage for not a of money if you find a used linestage.

Tube upgrading in the VTL is easy unlike the Audible Ill as the AI runs its tubes "hot" and can be difficult to upgrade to NOS tubes in. In fact, you should only use tubes supplied by a professional that knows they are going in the AI.

The AI also has an independent power supply. It is attached to the preamp with a non detachable cable and this cable is not that long.

A used Airtight ATC1 is an excellent choice, too, and has an excellent phono stage (for high output cartridges, low output require stepup).

Beware of used Convergent Audio Technology preamps. The manufacturer, Ken Stevens, does NOT want owners doing independent service/upgrades. All the caps are affixed to the PC board very, very well. Ken was not interested at all in telling us how to remove them. He was happy for us to send it back so he can service it. I sold the thing immediately.
Ive owned serveral Audible illusions preamps all the way to the latest m3a. I was a jbl nut also. Spend your money else ware. The stepped attens on those are a joke, the sound is great, You know a great speaker is the L150 my son. That will be a big diffrence. Keep your preamp. Use the money elseware. L150's. Its too easy to upgrade electronics people should do more speakers.
Thanks for the great ideas. I'm thinking I'd best stand pat for now and just relax and enjoy the tunes!
you have a great system. those jbl's are better suited for classic rock than pretty much anything out there. they(along with their sibling the 4312)are still considered classics. they were used to master more music during the our lifetime then all other monitors combined. the 4312 is still sold in japan and retails for nearly 2000 u.s. dollars. even at that price its a bargain.
Wow, I couldn't disagree more. No imaging, shrieking highs, colored mids and sloppy bass. They do thump and play loud which made them a popular rock speaker. Whatever floats your boat.
Thanks Jay! The I love my 4311's and would be hard pressed to part with them. The may not be "high end," but, as you mention, for what I listen to, they're best for me.

I met Richard Vandersteen (of Vandersteen speaker fame) at an audio store where he was demonstrating his newest line, and got to talking with him about my favorite albums and artists. It was he who suggested the 4311's to me in the first place because of their use in mastering all those great classic rock recordings.
I have a TAD-150 playing through a McCormack DNA-1 into Vandersteen 2CE sigs. I have never heard the JBL's but, if you really want to see what the TAD-150 can do get yourself speakers that image real well like the Vandys. I listen to classic rock also and the Vandys, McCormack, TAD combo really space the music out. Also, read the reviews on both the TAD-150 and the signature.

You make a valid point Eagleman. I've never tried anything but the JBL's in my system. I've made arrangements to try a pair of Reimer Mccullough GS monitors this weekend. I'm eager to hear the differences.