How much do I need to spend to get a preamp that sounds better than no preamp?

yyzsantabarbara
I will buy 1 more of these amps to run in mono mode

Hi yyzsantabarbara, just be aware when you bridge a stereo amp into mono, yes do do gain a lot more watts, but that’s where the advantages end, and the disadvantages start.

1: There is more distortion.
2: Lower damping factor (higher output resistance) which equates to less control in the bass.
3: Less ability to drive lower impedance’s of some speakers (maybe the Kef’s 3.2ohm in the bass.)

To me if your single Ahb2 has enough watts for you to drive the Kef Blade, which aren’t that hard to drive at 3.2ohm min at 90db and a benign -phase angle, it will probably sound better than two bridged ones. If not I would look at another amp/s without doing any bridging.

Cheers George

I'll put a vote in for the Second Edition Ambrosia preamp from SST: 

https://www.sst.audio/new-products/ambrosia-2000-second-edition

This is a new and improved version of James Bongiorno's first edition Ambrosia. James always believed in giving the customer a lot of functionality at a reasonable price. This preamp has tone controls, MC and MM phono inputs with low cut filters, tape loops, headphone jacks, many inputs, and now a home theater bypass input!
The volume control has 96 steps, 1db/step and there is a remote control with a big volume control knob. 
I've been running the Ambrosia Second Edition for a few weeks now and I am very happy with it. The preamp is very quiet. You can set a jumper in the unit to lower the gain by 14dB which helps lower your noise floor. This is good for people like myself who don't play loud. 
Check it out. 

$15,000.00!

“The result of trolling is that someone has to correct your misrepresentation- and then we go on and on, around and around. That's classic trolling.”

george, you’re clearly a knowledgeable person and have a lot to contribute and can obviouly say whatever you want but this sort of behavior tends to damage your credibility, if you actually care. You accuse others with a vast technical experience in the field for expressing their opinion for personal gains and one could argue the same for your opinion and your passive attenuators. Not a productive approach to exchange knowledge. And no, I’m not stalking you, just seem to keep running into the same thread and reading the same arguments.

I believe what Nelson Pass is indicating, is that with many sources, and in a perfect world ( system match ), passive would be ideal. However, he knows, as most of do, the perfect world does not exist. Just my interpretation of all my readings. Enjoy ! MrD.