I do actually have one decision to make before I go ahead I could use some input with. Im thinking I will have roughly 7-8000 litres capacity give or take. I have 8 drivers, so the question is, how many should I use in this volume of space? Obviously If I wire up 8 I can always remove some and blank off the baffle spaces, but Im interested in your thoughts.
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While pondering on this, Ive had another thought cross my mind. The LLT design has always been good for efficiency and low end output, do you think the IB drivers would work in that scenario, but isobarically loaded. This would give low end output from 4 drivers akin to an 8 sealed driver IB, more in fact under 15hz. Tuned low enough, to like 10 hz, Im thinking it could work, and again with the cabinet space saving attribute isobaric loading can bring.
Any thoughts on that John?
Thanks for the input. FYI, I’m in the UK, the room wont be ducted and is essentially concrete construction. The room wont be totally airtight but the subwoofer cabinet likely would. I realise I cant get below the driver qts, and I’m fine with that, I just don’t want it raising up excessively. I run and Anthem avr with arc2 and own and Onkyo with xt32 as well having REW and a mini dsp. I well covered in terms of eq, I just don’t want a high q system. If I can get to say 10,000 litres, are you recommending I go for an 8 driver system. Do you think the isobaric design would improve quality? Could, or should I test a single driver I’m say 1000 litres and evaluate that?
Stereodude – I have 8 drivers, but don’t have the capacity for a true IB install so the install would essentially be a sealed cabinet, albeit a very large one. As a result I only have enough cabinet volume to accommodate 4 drivers and attaining 4 times the Vas of those 4 drivers. This leaves me with 4 spare drivers anyway, so on the flip side, the argument might be, why not use them anyway. Power is a non issue as I have loads of that.
John, I realise the spl output figures aren’t really the deciding factor in this, what I’m more concerned about is that a 4 driver system in only 4 time Vas could result in a boomy system. The system Q should drop with the isobaric design if the cabinet volume remains unchanged, so I was thinking that as I have the extra drivers anyway, why not try the isobaric. I’ve also read the isobaric design lends itself to more accurate high quality bass, which is always desirable for me personally.moonfly on July 8, 2014 at 6:36 pm · in reply to: TD15H + for use in a subwoofer for HT and music use. #11247
Thanks for the info, thats very useful.
On another note, Ive also put some other drivers in on my quote request. Im looking at some TD10H or M for use in a 2 way speaker design intended for use as a sat/studio monitor type speaker to go with these subs. Tweeter will be an AMT from Beyma, so thoughts on these would be appreciated as well. Ive ear marked the H model due to its apparently smoother overall response, though I appreciate its not as loud and the M.moonfly on July 7, 2014 at 8:44 pm · in reply to: TD15H + for use in a subwoofer for HT and music use. #11245
Thanks for getting back to me. Do you mean the SPB15+? I’ve had a look at the spb15, I’ve not modelled it but just going of the parameters it looks like it would need a good sized cabinet, or possibly be even suitable for open baffle use? One of the things that draws me the the TD15h is the ability to work in smaller cabinets with a reasonable cost saving over the AV woofers. I potentially would want four drivers, and the AV is just too rich for me at that amount. I am also chasing the very best sound quality.moonfly on July 2, 2014 at 11:05 pm · in reply to: TD15H + for use in a subwoofer for HT and music use. #11243
No thoughts on this John? Ive also sent an e-mail with a request for a quote on six drivers, with possibly 2 of these to add to that as well, would appreciate some feedback.
No problem, thanks for the update John. Time isn’t an issue for me, I have working subwoofers so these are just woofers I want rather than need, but suffice to say the want is with good reason. I appreciate the difficulty getting a new product to market, just as long as we know were we stand as customers. Fingers crossed it wont be too long.