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Wiring question : amp-sub-speakers

I am pretty new to audio world and am looking for an advice regarding wiring Denon PMA 2000 IVR integrated amp, Polk PSW 550 sub and JBL studio 530 speakers. Current wiring is, Amp to JBL using the main binding post and Amp to Sub using preout. It sounds great up to certain volume level and JBL 5" woofer starts over-excursion, aka bottoming out, at a higher volume(knob 11 o’clock & >90 decibel) to fast tempo low frequency sound like drum kicks. I am not sure how to improve this situation. Sub manual suggest "Speaker-level" connections, i.e., Amp to Sub and Sub to JBL. Is it connection issue, JBL issue, or Amp issue? Thanks in advance.
ubee67
ubee67 OP
5 posts
 
Interestingly that was the part I was trying to figure out in the last hour. I guess this is how it works. My amp got L/R preout and L/R power amp direct.

L preout -- y adapter -- #1 crossover -- L power amp direct
                                 -- Sub (full range)
R preout -- #2 crossover  -- R power amp direct
djones51
4,947 posts
 
Page 6 of the manual on the Denon PMA2000 IVR, number 16 Pre Out terminals (PRE OUT) , under NOTE, No signal is output when selecting power amp direct terminal. You CAN'T  USE  the PRE OUT  and AMP DIRECT at the same time. 
imhififan's avatar
imhififan
2,228 posts
 
As mijostyn suggested, add a 300uF capacitor in series with your main speakers to roll off low bass at 6 dB/oct.

https://www.parts-express.com/300uf-100v-electrolytic-non-polarized-crossover-capacitor--027-371
imhififan's avatar
imhififan
2,228 posts
 
Or use a high pass filter in series with your main speakers to roll off low bass at 12 dB/oct.

https://www.parts-express.com/100-hz-high-pass-8-ohm-crossover--266-462
imhififan's avatar
imhififan
2,228 posts
 
What is a bass blocker and what does it do to my speaker?

https://www.youtube.com/watch?v=s_amOnIh1So

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