Audio Horizons TP 2.0 Preamplifier

Stltrains,
I'm very happy for you that the TP 2.1 preamp has worked out so well you in your system. Enjoy the music, my friend.

Grant, I might have spoken too soon. You have a point about a possible impedance mismatch with our amps. More to come.

The wife and kids are gone tonight all day Friday. I have the day off also!! I am listening to music late into the night and loving it. No doubt the 2.1 is coming into its own in my play room. It has been on with loud music all day and night thus far. Best sound I have had in my room.

My Belles Reference 350 specs are as follows. This is for Tvad to help me understand how these numbers mate with the AH preamp.

"Input sensitivity 1.98 for rated power"
"Input impedance 50,000 ohms"

Tvad, I think speaker wire also impacts impedance?

Sherod, I am staying tuned as I feel kinda bad as I think you decided on the upgrade based on my comments. I sure hope in works out to your complete liking.

Bill

As the calming of the seas are upon us, lets take a deep breath and wait for Uncle Joseph to respond to all our speculative discussion.

Sherod, I do not believe your preamp is broken in yet. I would try and use voice recordings to see how the midrange changes over time. Like fine wine it has to "mold" before you can enjoy it. Trust Joseph and his upgrade just a little more.

Well Gentlemen. I have decided to go on my own with a slight modification. My instinct to hunt( as Stltrains says about man) and my desire to know the truth forced me to do a little experiment. Tonight, I very carefully took out the new output caps and bypasses. I replaced them with the original upgraded Hovland 4.7uf caps from before the upgrade. The system has been playing now for about an hour. So how does it sound, you ask? The "breath of life" is back. The midrange now has that palpable realness that I've been missing. The soundstage now has normal front to back depth. Highs are once again clean and extended and the bass is as powerful as it was. The power supply mods that Joseph did seems to make an improvement. I get a slight increase in volume, but the dynamic differences are still realistic in portraying music. I'm sure that the new wire harnesses are also contributing to a cleaner sound as well. I'm not sure why this small change makes so much of a difference in my system but I'll guess and say that it was a combination of an impedance matching issue with my amps along with some phase irregularities that I mentioned in my previous post caused by the bypass caps. All I know is that I'm a happier guy tonight and my ears are pleased with the musical portrayal.