Add a Subwoofer to my Vandersteen 1ce s or replace with Revel Concerta2 F36

Thank you @sfall, @yogiboy, @kalali, and @hifiman5 .1 I have had the Zephyr for 5 months and it’s broken in. 2 My room is kind of rectangular and is about 12 ft deep by 16 ft. wide. I totally appreciate the one step at a time upgrade mode, and intend to get each new component about six months apart so I am thoroughly acquainted with my system, and am clear about what needs improvement. If I go Rogue first, would I hear enough improvement in the bottom end, that I would be happy for 6 months until a proper sub like the 2wq is in the budget again? Even with the weak NAD, it does sound pretty awesome, but there are certain furious piano passages on Analogue Productions -Nina Simone’s Little Girl Blue, and on the ORG’s Nina Simone Silk and Soul that get muddy almost distorted. I think it’s the speakers ability, and the lower end on say something like Ray Brown’s Moonlight Serenade just isn’t there. So I really want more full range depth and realism. Of course on a budget. Thanks again to all for your input.

Thank you to everybody who has weighed in. @sfall, didn't mean to start any conflicts lol. It's nice getting the reassurance that the Vandersteen's are a great speaker. I certainly have been thrilled with certain aspects of clarity and presence.  But I have known since I bought them that they lacked lower bass detail with my receiver (which initially was for dual HT, and two channel listening. I mainly listen to records through the system to ratio of about 90% records, 10% movies) And now realize that going exclusively two channel is more appropriate for my enjoyment. I mainly listen to post punk, rock, and blues, but as most Audiophile records are made for 50+ year olds by 50+ year olds( I know mofi has a bit of a wider breath). I now have a nice collection of jazz, and blues vinyl that sounds great! Anyhow, sounds like I need to audition the Rogue with my Vandy's first, and then the Revel Concerta F36's  with my NAD, and lastly a sub with my Vandy's and NAD, I've never auditioned any equipment, so not 100% sure how it works, but have read Robert Harley's guide, and there's an explanation of the process. I will say that I do trust my dealer Rick from Brooks Berdan, and know he'll be great council here, but it's always nice to get consensus outside of the shop. I appreciate you all!

Thanks again to all who have replied. Sounds like I will be listening to some Vandy 2's as well. After all it was Brooks Berdan himself who told me about the 2's back when I was just 19 and purchasing my first Rega Plannar 3 with Sumiko Blue Point set up by Brooks. I did like the sound of the Revel F36 with the Rogue Cronus Magnum II, but also heard shrill highs that seemed like eventually could be fatiguing, I also discounted that to possibly "still breaking in." Anyhow, really solid advice guys thank you.

O.K., I have listened to the 2ce's and was floored. Much, much, better to my ears than the Revels! Now then, 1 thing I noticed is there are a lot of used Vandersteen 2ce's out there. I may be really happy with getting a pretty decent discount going used and getting some decent speaker cables, as the 2's are bi-wired. Obviously I would also like to maintain a relationship with a brick and mortar, and an Audiophile mentor in that way. But I noticed that the 2's go from $500 -$1100 used on here, which is way less than the $2560 new. Also there is a great savings on a gently used Rogue Cronus II on here for $1900.00 which is also a great deal. But I have never bought any speakers or amp second hand. How do you guys feel about buying used? I mean I just barely met the Vandersteen dealer. We did have some amazing moments as he hooked up the 2's to a million dollars worth of turntable, mono amps, preamps and phono stage to show me what they could do. So I would love to buy from him and help keep him doing what he does. But I may be able to get the Rogue, and 2ce's for not terribly more than the price of new Vandersteen 2ce's. Any thoughts? 

Again thank you guys for the sound advice! I do feel like it's important to buy new and get the factory warranty if you can afford it. Like I said previously, I've never bought second hand stereo equipment, but always lust after the savings. Especially because I sold speakers at one point and know their mark up. At this point, I really think that it's two pieces that need the upgrade, - the NAD, and the 1ce's and then I'll rest for a bit and listen happily. I believe the 2ce sigs may be my next ten years, unless there's a glaring contender (at $2500 or less) that is up to the full range competition that the 2ce sigs benchmark at that price. IMHO of course 😉Oh yeah, and just for a consensus, any opinions on online new speaker purchases? If you're out of state, you automatically save the tax, and usually without a stores overhead can get a bit of a discount (10-20%). Should I ask the local high-end dealer to match this? After reading Robert Harley, I'm hesitant to ask a dealer to match a reputable (music direct) online dealers prices, or for any discount at all, as I don't want to be offensive, or annoy them. But I'm not affluent, have to wait for my bonus to buy, and have a two year old little girl that takes most of my funds, so every penny counts here. Lol

O.K. So I made a "Rogue" decision, and went Cronus Magnum II and kept the Vandersteen 1Ce's. I figured that since I really like the Vandersteen sound, and most agreed that I would hear a significant improvement overall with the better tube power. They are right. I am hearing more musicality out of my Vandersteen's. Now I am still on a mission to find the best bang for my buck in the speaker category. But this improves where I am, and gives me time to listen to more speakers, and save more money if need be. I won't say Revel's are completely out of the running. I do like an American made speaker, but maybe looking at the upgrade from the F36 up against the 2ce sig II. And adding the 2wq in the mean time maybe a temporary fix. Thanks for all the advice! It really helped. 

@CTSooner thanks for the encouragement! I believe I have listened to the 2Ce sig II on the same reference system. . . Randall at Optimal Enchantment?? Either way, I have heard the 2Ces fronting a reference system that has me a believer!  It's going to make it difficult for any sub 3k speaker to compare. But now on to the daunting task of listening to speakers. It's a trip how many speakers there are out there that never get any press or don't have local dealers. Makes you wonder what the possibilities really are. Also makes even the boutique audiophile equipment seem somewhat common. I wonder with companies like Harman, if having bigger manufacturing dollars affects the builds better or are they cutting corners somewhere (Revel made great and ethical while Infinity made o.k. in China to huge profits??). Typically big corporate parent means compromise. Anyhow, I'll be open to listening to all I can local to Southern California under 4k. I prefer to be under 3k but if there's something at $3500 that I'd be a fool not to enjoy my Vandy's and save a bit more for, I will, as I want to settle in and enjoy for 10 years. Thanks again to all who've weighed in.