Question Does a £279 price tag make the KEF Q400b a worthy purchase?

Discussion in 'Subwoofers' started by Badcav203, May 10, 2017.

  1. Badcav203

    Badcav203
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    Recently purchased a Pair of KEF Q900, and a Q600c at waht I consider fantastic prices due to the new models and clearance of the old stock.
    Upgrading from a little Tannoy HTS101 system which has been great, that was a downgrade 4 years ago from MA BX5 setup to clear floor space due to a little one crawling around. So over moon with these and being back into full range setup.

    So now I am considering a Sub purely for movie usage.
    Looking around £500ish budget and towards a BK option.

    I do seem to suffer with some horrid acoustic room modes and nulls for subwoofer performance due to having an almost L shape room and without the sub sitting in the near middle of the room which isn't an option, can't resolve so have to have the happy medium.
    Acoustically, I don't seem to suffer the same problems with speakers whether small or large, so I would assume placement is the real issue. However, my options are limited.

    I assume these sound issues will only be emphasized going with a bigger more powerful subwoofer unless placing correctly and clearly a larger box will reduce placement options even further meaning that to EQ flat, I would be limiting the overall performance advantage anyway?

    In this situation and from research, I gather that I would be better with two to help smooth this out and that a sealed box will also help?

    So this brings me onto if two Q400b would be a good or better choice for the price.
    There is little in regards to reviews on this model. I am particularly impressed with the Q900/Q600 performance and being a sealed unit imagine this will also have an advantage of working well in a system used primarily for music.
    Although I don't really consider this as a major factor in my decision as the performance is perfectly acceptable from the mains alone and I always run direct mode.

    I accept that the single BK Monolith or XXLS400 will rule a Q400b and that at a £500 price point there are alternatives such as an SVS that may well serve better than the KEF in a single application.
    If it was a single subwoofer purchase I would most certainly be looking at the aforementioned options. But, essentially if having two units will solve some of my issue, I can't stretch the budget to £1000 to have two of those 'preferred options'.

    So will the heavily discounted Q400b be a contender, should I consider a couple of the smaller BK Gemini II instead which is cheaper overall or just go with a mono,XXLS400.

    Adding an additional Monolith or XXLS400 isn't an option due to WAF. Convincing her to have one sitting in the room is going to be hard enough.
     
  2. flyingalbatross

    flyingalbatross
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    Problem is that if you can't put one sub in the right place to avoid a null at listening position why do you think you can put a second sub there?

    Two subs won't fundamentally alter the waveforms bouncing around the room. If there's a big null it needs to be solved by placement. A second badly placed sub won't help.

    If you're struggling with placement, consider adding an anti-mode to the sub - they CAN work wonders. (An antimode is a room EQ for a sub to combat nulls at MLP). Or place one sub in a good place to start with - only then consider a second.

    Adding a second sub can help flatten a room response, but if the first one is in a crap place, putting a second one in another crap place won't magically fix it.

    I'd probably pop for a BK P12-300 and the saving towards an antimode. Remember, distance selling regs are your friend for testing at home ;)
     
  3. Dolus

    Dolus
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    Google advantage of two subwoofers
     

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