Subwoofer advice


Sorry in advance for the long post but I thought it would be helpful to give as much context as possible in order to receive the most accurate advice.

I am new to this subwoofer thing. Currently I have a traditional stereo system. Dedicated amp/pre/dac and Harbeth 30.2 speakers. Now I am not unhappy with the bass output of the Harbeths, in fact, I was impressed with the useful output I heard under 50hz, even though they're only rated to 50hz.

I was thinking adding a powered sub or perhaps two subs would be beneficial as my Harbeths start to roll off around 40hz and I get no useful output below 30hz or so. I don't consider myself a bass head but I do like the occasional Daft Punk song, and know that a good sized woofer can make all the difference in a system. I think the Harbeth Radial driver is swell, but it struggles at higher spl, under 50hz. (Herb Reichart mentioned the logo will rattle against the enclosure with strong subbass, he wasn't joking)

I don't wish to add a processor into my chain for subwoofer management, even though I could (my preamp has home theatre bypass) I would rather do the "traditional" way where I set the crossover of the sub to maybe around 40hz and adjust placement in room manually by ear.

My room is small, 10x14.

My questions are thus: what brand should I look to get?

Should I get one or two subs? One to start?

What considerations must I factor in for seamless integration?
d2girls
d2girls, I hope you allow my opinion. If adding a subwoofer or 2 to your system, it will definitely extend the last octave to your systems presentation, but, unless you cross over the main amp ( Pass 30.5 / Harbeths ) from running full range, and keep the higher spls the same when listening to Daft Punk, you will still hear the struggles of the Harbeth woofers you speak of. Hopefully, others will jump in with their experience and expertise. This has been my experience. Enjoy ! MrD.
@mrdecibel 

can you explain the best way I would crossover my speakers / amp?


i would like to do it in a way that allows me to use my Pass amp. I guess I am okay to use a processor or a device that messes with my Harbeths playback below a certain frequency, as long as it a. Allows me to keep using my amp, and b. Does not effect the sound quality in a negative way.
I run my mains full range and only run across over to my subs to fill in the bottom. I don't notice the mains struggling at all, they just naturally roll off below 50 as they normally would.
 Given the OP has such a small room I would suggest to start with one and just run it off the second pair of outputs on your preamp.   Go with Vander Steen or REL. 
 I am not saying  Mr. decibel is wrong, you may find that you notice the woofers on the Harpeth struggling. But I would doubt it given the size of your room.   If you do you can just add a simple capacitor in line to your main speakers to accomplish and earlier rolloff  
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