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


Hello all.
I'm using an Audible Illusions L1 preamp and I think my system sounds better when I remove it from the signal path. Oppo BD105 directly to SMC Audio DNA1 Gold power amp. I have read that there is level of quality you need to hit before there will be an improvement in sound. I can't seem to find what that level is. Any ideas?
Thanks in advance,
Ben
honashagen
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. 
“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.
Thank you mrdecibel, and that's exactly what I post  "system (impedance) match" whether it's direct or with passive, which today is more the norm than the exception.
 There are just some here that are protecting their interests, like a dog with a bone.

Cheers George