Thanks Prem for your inputs. Unfortunately the speaker positioning will be a constraint for my room for want of space. I have currently gone for the golden ratio room placement with 1:1.6 ratio front to back which gives decent image depth. The speakers are around 22" away from the side walls (center). Room reflections from the sidewall is an issue as the FR driver has a increasing directivity from 200Hz onwards and need to be towed in to avoid the side reflections.Hari, work on the positioning of your speakers first. I think it’s a room problem
What cables are you using now?
First get the system to sound right without the sub. Introduce the sub later once you have got your balance right
Currently the cables are diy which are polycab telephone cables with copper purity of 99.7% (as per their brochure) which measures 22pF capacitance in my LCR meter for 1+ meter wire. These cables were more detailed and punchy compared to the DAC cables from Darshan Joshi. The DAC cable measured 350pF capacitance and hence highs were getting rolled-off which could sound more releaxed for long time listening.
I think its more to balance the setup vis-a-vis the pre-amp stage, power amp, speakers and the cables so that they could sing in unison.
I am working on the LPF stage for the preamp as i can hear some residual noise at moderate level which can be from stray RF and EMI interference getting modulated with my audio signal. So thinking of adding a simple RC filter to check if they benefit. Also i have studied schematics of Sony Amplifier and Marantz Reference amplifier PM-15S1 which has similar RC implementation in their line inputs and phono output stage for maybe similar reasons.