Subwoofer, Active Vs. Passive

Actives are cheaper and are not necessarily worse than passives. If you want a passive you will need to buy a good amp and a crossover, plus more cables. When you plug in the price of a good amp & cross over, you'd probably find some fairly decent active subs.

Slappy, although I've made a comment or two about active and passive subs, I hope you don't think it was me who used the word crappy.

However, I wouldn't hesitate to use the word mediocre. As I don't believe there's one active speaker/subwoofer mfg'er yet who has received any special recognition for their beautiful amplification.

For that reason alone (there are other reasons), I would focus on the absolute best amplifier I could find and couple that with the best pair of full-range speakers that are capable of going down to the low 20Hz's or lower.

As for answering your question, the only passive sub I'm aware of is the German Physics sub which sells for about $13k.

On the other hand, the Von Schweikert VR-4 Gen III SE full-range speakers go down to 16Hz and retail for $6k and some reviewers claim this speaker to be the best speaker under $20k. If you believe them.

If the VR-4 is half of what others claim it to be, and you were able to find the right amp, You'd probably have a bottom end that no sub could approach.

-IMO

Well think about it. We try so hard to isolate our amps and preamps with cones and pucks. The worst place to put an amplifier is inside a sub enclosure. However, it sure is handy and it reduces the need for component space. The key to powered/passive subs is the ability to dial them in right. If you need bass extension a sub can work. I have difficulty matching subs with speakers that cut off 50hz and above. I just finished a passive sub project. I will let you know how it sounds.

I made the post on the amp quality. My post was in regard to subs with balanced inputs, I stated that most amp quality in active subs was about $80 and that many active subs have very short warranty on the sub amp. These statements are true in most cases but not all and were made in regards to the % of active subs on the market with high quality amps (not many). I won't get into which type (passive/active) sub is better because there is no real answer so the buyer must do their homework. Building a sub would be a great project for you Slappy, there are many kit's on the market and most can come with pre built cabinet if you have no woodworking skills...you will not need a crossover if you are going to use the one in your pre/pro. My sub is a large passive (Vmps) and can be orderd as a kit. I drive it with an Onkyo M-504 amp that puts out 325 watts into it's 4 ohm load. This sub is the bottom half of my Large Vmps Supertowers which I also sometimes use as subs for a three sub setup. Hope this is more clear, there are many good active subs on the market from high-end companys that use good amps...there are just many, many more who don't.

Dave