I came to this site almost a year ago and had zero knowledge about hi-fi, mid-fi or anything-fi. So I read like every post I could and started on an extremely enjoyable journey to enjoyable listening. My music sounds so much better now and it didn't cost a fortune, so I decided I would post a list of things I did to save you time. Most if not all these items are from posts I've read here or direct contacts from others here doing the same thing.
1) Bi-amp if possible-its worth a listen-my AV receiver had 7 channels and using a feature where the back surround L & R were able to
be used as Bi-amped front channels was a game changer.
2) A dedicated Digital-to-Analog Converter (DAC) a component that takes a digital source signal and converts it to an analog signal so
we can hear it, these can be had from $99 to ??? and definitely take a little research but are worth the effort.
3) Tube sound is totally worth a listen...I love the sound my system has because I run everything through a Tube DAC/Tube Buffer..
again something to investigate but if possible try it you might really like it as I did. Sound is personal-go with what you like.
4) If like me you have alot of music on a computer and want to bring that music to your HT or Stereo rig there are many ways and
many price points. I kept reading about something called "Squeezebox"-its made by Logitech and makes it easy and pretty cost
effective to bring your music from your PC wired or wirelessly to your main setup. I'm not affiliated with Logitech and there are
many ways to accomplish this-the Squeezebox works for me so I'm mentioning it.
5) Power conditioning, clean AC...lots of ways to achieve it and it helps.
6) Raise your sub off the floor and bring it out of the corner if it resides there, made my low end tighter and took away "boomyness"
My sub currently sits about 10 inches off the ground and on an even plane with my speakers. I stuck it on a box first-easy tweak.
7) Acoustic treatments-I drap a blanket over my HDTV, and other large items in the room when really listening-its cheap and works
until I have the budget to buy or make real correct items for room treatment.

Speaker placement-I talked to a gentlemen who builds them for a living and asked him for a general rule and he said "if you start
by using an equilateral triangle with your listening area at one point and each speaker at the other points thats a good general
rule"
9) Tubes can be swapped-if you tried the tube sound and like it you can even change that sound by changing tubes within the same
size. Different tubes produce different "flavors" of sound and are relatively inexpensive to change or "roll".
10) Caps or capacitors are like tubes but in the solid state world and can also be changed but this takes some now how and soldering
skills...not as easy as swapping tubes but its definitely doable.
11) Cables - Cables strike me as unique in many respects as tubes, different cable/mfg/type etc. produce different types of sound.
They are an extremely controversial item and I suggest you try different ones if possible then decide which brings me to...
12) Equipment tours- They are in my opinion a great way to hear different items within your own setup in your own home at your own
leisure. Once you get established here its not hard to look for any "tour" announcements and get on the bus-they introduced me
to many items that I have since purchased as a result of hearing them with my gear and my music. Great resource!
13) Vintage equipment is not a dumb idea, I have several pieces in my setup and in fact the strongest part of my system are vintage
speakers. I have found tremendous bargains on the web via CL and others...buying old stuff "vintage" is a great way to check out
different types of things and not get burnt.
14) Source stuff-Vinyl,CD's, whatever-amazing deals via the web..I personally buy all used CD's-some as cheap as .75 plus shipping
import them to my PC and file them or play them. Vinyl guys will help you find Vinyl..there is a great used vinyl store near me and
I'm in BF!
15) You can throw as much or as little into this hobby as you want...once you start it's a blast!!!

Enjoy!!!
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16) Ask questions in this forum. My experience is that you get great response and excellent suggestions tailored to your situation, based on the information that you provide.
17) One addition I'd make to your list is isolation pads for bookshelf speakers.
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This post is only meant as a place to see some of the ideas I've used or tried in the 8 months I've been coming around here. If you
have some ideas of your own post them below, if I have mentioned anything that is totally wrong-correct me below....
Have fun!!