Finally get to test the SB12 dsp model thanks to bro htkaki. I took off the sunfire and replaced it with the SB12 as my quad sub setup. First impression is that the sound is cleaner and bass goes lower. Will test more tomorrow with REW to find out whether my judgement is correct.

I think I'll need to further fine tune it as I suspect there is some cancellation with the Rythmik F15. When I stacked both, the spl meter reading actually dropped.

This post has been edited by DannyOP: May 8 2011, 03:04 AM

Shifted my pc12+ to the right hand corner at the back, the LFE are much better now, more rumble

Danny, please post your REW.

Taukeh mpyw, your sofa very comfy lah. So, got 'massage' now after shifting the sub?

This post has been edited by htkaki: May 9 2011, 10:49 PM

Updated REW :-



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Purple = Svs stacked on top of Rythmik F15 (rear left)
Blue = Svs on 4th corner

the REW FR graph is taken with subs only or with the front also?

With front also

What is your front's xo?

It's set at 90hz.

Why did you pick 90hz?

From previous graphs 90hz turns out to be better results.

Once you have tried out my suggestion, please post your updated REW

Good for you. I can't use 80hz or 90hz crossover since got big dip around crossover point there.

The dip is gone if I use 60hz or 100hz crossover.

A forum member here going to pull the trigger soon on SB13-Plus to partner with his PB

Tried your suggestion.. The graph changes dramatically.. but need a lot of fine tuning as what is on the graph and the actual sound is very different. Will post my updated rew soon. Today need to go penang for meeting. Very boring place for hifi.. If wanna do demo svs showroom in penang let me know lol.. Got lots of office space available in my co.

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Added on May 14, 2011, 9:09 pmUpdated REW graph .. straighter up to 40hz :-



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This post has been edited by DannyOP: May 14 2011, 09:09 PM

I am glad that my suggestion works out quite well judging from the graph IMHO, this graph is considerably very good as it is not easy to get an almost ruler flat FR graph due to many limitations esp in your case.

I must say that it is job well done mainly due to your persistent hard work.

In terms of lfe this is the best I managed to get with the most rumble :-



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This is with subs at all 4 corners while the post before was stacked. I noticed that the dip at 53-54hz is caused by the rythmik F15 because I tested 3 subs without F15 the dip wasn't there :-



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This is running with only 2 svs subs :-



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As u can see with 4 subs the lfe is strong even at 10hz while 2 and 3 subs it cuts off earlier at 16-18hz

This post has been edited by DannyOP: May 15 2011, 03:26 AM

The 4 subs at 4 corner looks better. Must find a day to audition youur system.

Yes pls come visit. I need u to help me decide.. 2 less powerful sub or 1 powerful sub at the back. I tried pairing a lower powered sub ie sunfire with sb12 but no kick.. I suspect a more powerful sealed sub will have better mid bass.

This post has been edited by DannyOP: May 17 2011, 04:53 PM

Took another FR reading after playing with the tuning modes on the PB13s.

This is subs + mains with Audyssey on. Crossover at 100Hz:

Looking good, how does it sound? Extension till down below 10Hz. I remember with my dual F15s I get extensions till about 5-6Hz as well but its not this flat due to my room characteristics.