Are you using bookshelf speakers that only reach to 200hz? Hooking up L R stereo subs may help the soundstage. Subs integrating at 20hz, probably not much, but I'm not convinced there's no difference with all recordings. Not everything is mixed to mono.
No way full range speakers give you LF at proper DB. Also, placement of full range is not optimum for LF. Bloated or thin LF is improper integration/placement/phase. At a minimum use a test tone sweep of low frequency. Hook up both ways and experiment w placement.
No way full range speakers give you LF at proper DB. Also, placement of full range is not optimum for LF. Bloated or thin LF is improper integration/placement/phase. At a minimum use a test tone sweep of low frequency. Hook up both ways and experiment w placement.