I was wondering if it is of much use to practice voicings starting on other notes then 3 or 7.
Let's say in case of 3note voicings
voice them 537 or 573 .
And with 4 note voicings starting on the 9th voice them 9357.
I find them handy to move from one chord to another but sometimes the 5 on the bottom sounds odd especially in LH.
I was adviced in the past to concentrate only on the A and B (1,2)positions and as I have litlle time for practice maybe better use it for other exercises?
Thanks

Yes definitely worth investigating. There are many wonderful and different sounds available by voicing chords in different ways. If you find a nice voicing write it down and work it through all the keys, make it part of your vocabulary so it can become a part of your sound..
Probably a good idea to get familiar with all the voicings from the 3rd and 7th first though.

A question: how good are you at the A and B voicings? I assume you want to learn these voicings for the left hand to comp while you solo? If so, at least for me, most of my brain is focusing on the right hand solo, and the left hand voicings need to be all but automatic. Trying to learn more than the A & B voicings may lead to the situation where no voicing comes automatically; you have to think about every chord. So I'd recommend getting really good at the A & B stuff (that's what my teacher had me do). If that stuff is down cold, by all means explore other voicings.

This actually points out a key questions in learning jazz: short term versus long term. There are many times when you have to decide whether to learn something like comping voicing in a simpler way the you eventually want to do it, so you can actually use it. This however, means that someday you'll have a habit that may be diffuclt to change. However, trying to learn it the full blown way may the day you can use that skill competantly is far off. For the posters question, since A & B voicings are great, I think they should be enough, even if it's later hard to start using some other voicings.

Yes, it's definitely worth investigating.

From a plain and practical standpoint most people practice voicings w/ the 3rd or 7th on the bottom. They voicelead well and so are useful.

That being said IMO voicings should also be thought of from a melodic standpoint. What is the top note of your voicing? Does the top note create a nice counter melody to the main melody above the voicing?
So, by expanding your position/top note concept you have the ability to create more interesting melodies.

Thank you people for help ,so I guess getting solid at the AB and then expanding to other positions instead learning all the positions from the beginning would be the way to go.
But how good at AB before learning the others ? Does it mean not looking at the keys and playing Confirmation at 180 bpm LH vocings with one hand kind of thing ?

Learn then so you feel comfortable soloing with giving too much thought to the left hand. Not the hardest tune you know at a fast speed, but the average tune you will play.

One other thing about the A and B voicings. You'll find for many, you're only going to use one of them 90% of the time. For example, for G dominant, I almost always use a voicing where F is the lowest note (whichever voicing that is.) It would be very rare for me to use the voiding where B is the lowest note because it's a bit high up for a left handed comp. You can certainly use it, but you'll find that the voicing that takes place between say about E below middle C and D above middle C is the one you'll use the most.