Infra bass amplifier on budget

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   Hey all!

After intensive reading of this forum on the subject for 4 days i do think that is better to ask you guys for confirmation before push "Add to cart" button in the shop, so this is my first post :)

I do have an BI-amped audio system which is split in 2 parts, one is for bass duties below 100Hz and second part is do their job from 100Hz UP.
I'm interesting to buy an amplifier which can play well on lowest notes (30Hz or lower) in my small ~17sqm room with a 230v/13A grid.
I do not want much of SPL because i rarely listening music or watching movies on loud levels but i do really need to constantly "feel" that subbass presence even if music plays just as background because i'm kind of "silent SUBbasshead"  I'm not interesting on >30Hz tones, just for low low low frequencies...that what is interesting me. I'm listening mostly electronic - techno, dnb, dubstep and similar bass heavy music.

Currently i do have this plate amplifier:
 https://www.speakerpower.net/store/p30/SP1-6000-HT_Subwoofer_Plate_Amplifier. - https://www.speakerpower.net/store/p30/SP1-6000-HT_Subwoofer_Plate_Amplifier.html

It is mounted into my Mark Seaton Submersive HP subwoofer:
 https://seaton.net/product/submersivehp/ - https://seatonsound.net/product/submersivehp/

Also
 i do own an additional HP Slave module of that subwoofer, so this 
single Speakerpower SP1-6000 amp feeds in total 4 Eminence LAB15 drivers 
because each of the boxes has 2 loudspeakers like this one:
 https://eminence.com/products/lab_15#specifications - https://eminence.com/products/lab_15#specifications

600rms/1200Wprogram
4OHM

These
 drivers are custom modified for Mark Seaton by Eminence and instead of 6
 Ohms they have 4.5 Ohms (have checked that myself with a multimeter)

SpeakerPower
 SP1-6000 amp operates perfectly good and without issues but...works in 
mono only. I want to change that. 
My plan is to pull out that plate amplifier and make 2 subwoofer boxes 
to operate in stereo with an external amp via DSP (which i have already - MiniDSP SHD studio with DIRAC). 
Also i do have an BK Electronics Monolith+ active subwoofer which is good on low notes and will be in tandem with those above...

So my question - is there any better, new or used, than "usual suspects"  for a Deep, Low, Powerful, Heavy, walls, floor and skull shattering BASS than:

-Proline 3000
-Audio Crest CA18
-EV P3000 / Dynacord L2400
-Crown MA-5000
-Kind XT4000
-Void Infinite MK2
-QSC MX3000 / JBL MPX1200

Many of those heavyweights are old now and hard enough to find in a good shape, hence first in the list is Proline 3000 which i can buy new here in Europe.
Or is better to look into class D ones? If so, then which one is good enough for sub bass duties below 30Hz? 
I do have some offers for used but in good shape PKN amplifiers (XD4000, XE4000, XE5002, XE6000) but do afraid that they cannot do properly on sub bass tones and are only good for upper frequencies what for me is no go and full stop.

In older posts on this forum i have read that for really low bass frequencies transformer based heavyweight amps are much much better, it is true even today?

So guys, please help me to spend my money wisely and make a right decision which way to go - new T.Amp Proline 3000 or any of used but in good condition PKN amps? Or maybe there is another, even better choice to fulfill my SUBbass-head needs? :)
(Yes, i know there is a bigger brother of Proline 3000 exists - AONE4400, but is unavailable) 

So in summary:

Small 17sqm room
4 Subwoofer drivers (each of 600rms/1200program watts, 4OHMS) 
~1000, at very most 1500 euros to feed them.

What are my choices?

Thank you!
Zilvinas