Help plz,I wnt to buy a sound system here r my selected products but it should have good bass quality..?

Go for Sony ! Its every sound product is very good in bass quality. Just check out the subwoofer & its output when selecting the sound system, as the bass relies on the subwoofer.

First off there is no such thing as PMPO, this is a marketing BS spec that has no standard definition. It's the same thing as saying, "A sh#t load" of power. Don't buy any product that uses this spec, the people behind any product using it belong in prison for deceptive trade practices.

If you want good quality sound especially good quality bass don't buy any HTiB. If you do buy an HTiB, buy an upper end Onkyo but it's better just to avoid all HTiB systems.

Good quality bass comes from the subwoofer so if that's what your primary focus is, spend a lot on the subwoofer. The best subwoofers are custom designed, they use a lot of large cone drivers and are either infinite baffle or open baffle. This can be affordable if you can do it yourself but otherwise it can be far too expensive. The next best thing would be to go with one of the better subwoofer products available commercially like SVS. You're still looking at a couple K$ for a sub with the SVS. If that is too far outside budget then consider Emotiva, that's more in the $400 range.

There are a number of decent receivers from Onkyo, Denon etc. Don't even think about Sony or Samsung. Maybe some of the higher end Sony receivers are ok but there are definitely much better choices.

Speakers are a bit difficult. The best are custom designed and like custom subs can be affordable if you could do it yourself but realistically this requires years of experience and probably more dollars in measurement equipment and CAD software than you want to spend on the system. Lately I'm suggesting Klipsch primarily due to their higher sensitivity but speakers are very subjective so you really need to listen for yourself and decide what sounds best to you. Especially with speakers don't even consider any of the Asian electronics companies, none of these make good speakers. Only consider companies that specialize in making speakers.

Don't make the mistake of thinking that power is a representation of output, it isn't. It's not like a light bulb where you choose 60 watts, 100 watts, or 500 watts depending on how bright you want it to be. There is no direct correlation between system power and sound output. Output of a speaker is expressed in dB SPL based on a 1 watt or 2.83 volt input measured 1 meter from the speaker. Doubling power increases output by + 3 dB. 10Log(P/1watt) 100 watts is in theory +20 dB louder than 1 watt. Non linearity in the speaker may reduce this.

The specification you need to look at more than power is sensitivity. The higher this number the less power is required to get a given output. The less power required for a given output the less thermal variation in the voice coil. Thermal variations in the voice coil causes the impedance to change. This translates to distortion. So, when you see huge power ratings on speakers it may seem impressive but in reality it's a bad thing. Huge SPL with minimal power required is what you really want. A single speaker that claims power ratings like, "1000 watts" is a piece of crap. First, reality is that it probably will not handle that and second, if it needs that much power it is very inefficient and will put out more distortion than anything else. Avoid speakers that make such absurd claims. In fact, don't pay much attention to power ratings at all, they are for the most part meaningless.

To have a perceived double in output you need 10 times the power so to sound twice as loud as 100 watts you need 1000 watts. While many HTiB's may claim 1000 watts or more, a typical "1000 watt" HTiB is closer to 50 watts. Don't pay too much attention to power ratings because it simply takes too much of it to make a significant difference. The only way you can fully utilize large amounts of power is by distributing it across large numbers of speaker drivers such as large line arrays. You simply can't put enough power into a single speaker to make much difference beyond about 100 watts. Even if it handles it, it will simply compress and not get the theoretical SPL gain.

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Go with the Sony dav dz series I have the 1000 watt dav dz 170 and it puts out a lot of bass.