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Some may consider this process, as explained in the video linked in this post, to be a bit tedious, but this is how I discovered that my Left and Right speaker locations should not be the same distance from the front wall. I can link to some videos that go through great detail about how...

Your Vantage speakers seem to have the same generation panel tech, so nothing to be gained in that respect by buying a new model, assuming comparison with similar size panels. It seems that the ML models made in the mid 2000's have the same tech as current models in the panels. There might be...

Might be splitting hairs on this one. Your Vantage has a single, but powered, aluminum cone 8" woofer, and has a slightly larger panel area. The ESL X has dual, but passive, paper cone 8" woofers. If your Vantage speakers are still rockin' and sound great, I can't see changing to the ESL X as...

On the C18 there is about 1" between the stat panel and the edge of each woofer. And like you say, there's a few inches of space at the outboard edge of each woofer. I am thinking this is for air volume inside for each woofer. I can't find any drawings to show how the box is put together. It...

Your Theater i is a very different panel design with an open back to the panel vs the C18 being a closed back. I went from the Motif to the C18 Focus, so it was "mostly" enclosed behind the stat panel of the Motif to a totally enclosed design on the C18, but that aside, there is no comparison...

These might be ok for a sound-bar alternative. But the 100Hz low frequency response is optimistic, so be prepared for adjusting way up from this spec. I looked at these before I went with in-wall speakers, Martin Logan IW, which I use for Surrounds and Rears. Even though these are rated down to...

I agree with everything @DanR said. You may want to consider this though. If a used amp is $4000 and might need some work, you might want to look at some demo amps which are sold as new and have a warranty. I know of a local dealer who routinely offers demo amps for steep discounts. Some amps...

I'm only showing what a HDMI Fiber Optic cable is like. Other technologies are quite different. Telecom is probably 100% fiber for the cores that carry data, and then however the jacket is constructed, so, no copper would be carrying any signals. And, you're pretty lucky to have FO at your...

I don't know if this is how all fiber optic HDMI cables are made, but all of mine have 4 Fiber cores and the rest are Copper cores. So they are not 100% fiber optic cores. The generic image below shows a pretty typical construction with the optical fiber cores in the middle of the cable.

I used Bob Latino M-125 mono tube amps for a couple years, but struggled with liking what they brought to the table vs a Krell solid state amp I was using prior to the tubes. The M-125 amps had the best soundstage I ever witnessed! The absolute realism was astounding! But the frequency dropped...

Then it's a ground loop hum. You'll need to swap cords plugged into outlets to find a combo that works. Map out what's plugged into which outlets on which circuits, mix and match, and see if some things, like the tv, can be plugged in closer to the AVR. You can also try lifting the ground on...

Couple things. Are you saying that you have RCA interconnects plugged into the Krell amp and the amp doesn't have shorting pins installed on the XLR inputs? I wasn't aware that this would work without issue, or maybe it's the cause of the issue. Try unplugging the AC adapter for the C18, while...

I have experience with BasX amps, I still use one of them for my Surrounds/ATMOS channels. I also have an HC-1 amp for my Center channel. I tried a pair of HC-1 amps for my 13A speakers and they worked very well, but since they weren't better than the Krell amp I had at the time I kept the Krell...

Isoacoustics Aperta Sub I love the Isoacoustics products. After getting their footers for the subs, the window rattle went away - except at more extreme volume levels, but the point is that the mechanical coupling was greatly reduced so most of what's left is airborne. Another thing that can...

The premise here is that, even at lower volume levels the upper frequencies can be attenuated if the amp can't quite get enough power through to the speaker. I've been meaning to do more testing on this, but this year has just been super busy. Things are just about to get slower for me which...

Be afraid, be very afraid!!! just kidding. But, I can provide a graphic showing how my 13A with active woofers is seen by the amp as having very low impedance at upper frequencies. The graphic in the linked post below, the Red Trace shows the speaker connected directly to the external Krell...

Have you checked the caps? The big ones look a bit crusty around the top seals.

Looks like my living room when I'm testing.

So this is the "measured" response, correct? Not a predicted response? Yeah, if you can get a measured response like this and group delay below 20 and keep the dynamics at the same time (unike when I really, really tried with MSO but failed, looked great but sounded awful), you're a lucky dog!

Kudos on lovin' the system! Don't bother with changing out the ATMOS Heights. Not enough going on with those channels to warrant a change. Those channels mostly have supporting sounds, not like the front stage channels have.