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Infinity Irs Beta

I recently purchased a set of the Irs Betas. My system consists of a Krell Kct Preamp, Krell Kps28 CD player, Krell Fpb400 cx which I am powering the mid,high panels and using the cast interconnects between them and a Krell Ksa300 for the bass towers with the servo unit. Would tubes on the top end be a big improvement? Any folks here run tubes on their Betas and have you compared the two? It sounds wonderful as is.
rvito
okeeteekid's avatar
okeeteekid
142 posts
 
I read somewhere that when Infinity was designing the IRS series speakers they used audio research tube amps on top, I have the IRS Epsilons... they are awesome speakers that sound very similar to the IRS Beta's aside from the bass output, congrats on your recent purchase.
mitch4t's avatar
mitch4t
1,611 posts
 
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Betas are excellent speakers when they are good... but sometimes they show their age. They're around 25 years old. The bass modules and servo could use a 21st century update.
Next to impossible to find parts for the tweeter,midrange panels.
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dweller's avatar
dweller
3,788 posts
 
Isn't the "IRS" also known as the IRS V (5)?
While attending technical school (around 1983) I joined a group of EE's for a tour of the WFMT studios in downtown Chicago. WFMT had a recording studio/hall with a pair of the gigantic IRS modules 10-15 feet up on the walls.
BTW, we asked the head engineer where he attended school.
His reply: "Self taught". -Mind Blowing!
mofimadness's avatar
mofimadness
4,992 posts
 
The last version of the IRS was the V (5), but the IRS series all started with the IRS I, then the II, then the III, then the V. There wasn't an IRS IV.

They are indeed MASSIVE speakers and sound that way too. I've heard them several times and the word DYNAMIC always comes to mind.
rwd
695 posts
 
So good to see Sirspeedy back in the rooms commenting again! Yes the IRS Beta's are a fine (great?!) speaker. I have the model before that one (The Infinity RS-1B's). I agree with all the comments above. Tubes on top/SS on bottom. I have used Audio Research VT 100 and Hurricanes on the top and now MacIntosch MC 275 (2 of them in mono @ 150watts per).

RWD (Rick)
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