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Post by paulus55 on Jun 21, 2011 18:50:48 GMT -7
What are people here using for their overall volume adjustment? Maybe just a humble Preamp with input selector and volume would be adequate?
Also there's plenty of discussion here about controlling the bass, but what about an active crossover unit for controlling the non bass (mid and upper)? Is there a combined unit available that does both (1 way and sub crossover), but also has some versatility, such as parametric eq, adjustable crossover freq etc.?
I have found a few online, but they are either very basic, or have a lot of bells and whistles and cost an arm and a leg.
Any suggestions?
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Post by ThomasW on Jun 21, 2011 21:21:45 GMT -7
Most are using the sub out from a HT receiver or Pre-pro Is this for a music only system? |
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Post by paulus55 on Jun 22, 2011 2:21:16 GMT -7
Ah, that explains it then. - A Receiver would have crossover stuff built in, and enough power to drive the loungeroom speakers. The 'sub out' signal would also be governed by the Receiver's Volume control, so there is no need play with the Sub Amp's volume, except for 'on the fly' adjustments. I will be setting up a multi-role system for music, movies, and, wait for it.. karaoke  - this is when the sub can take a rest. I have an opportunity to utilise the concrete stairwell as the containment area for the IB Drivers. It has a volume of around 1100Ltrs. Should be adequate headroom for a pair of 15 inchers. |
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Post by chrisbee on Jun 22, 2011 13:10:13 GMT -7
I will be setting up a multi-role system for music, movies, and, wait for it.. karaoke - this is when the sub can take a rest. I have an opportunity to utilise the concrete stairwell as the containment area for the IB Drivers. It has a volume of around 1100Ltrs. Should be adequate headroom for a pair of 15 inchers. Let's assume you intend to use a couple of IB315s from Fi. Vas is ~270 litres. Total Vas = Two drivers = ~540 litres. 1100/540 ) = Total Vas multiplier of ~2. We usually recommend a Vas multiplier of 10 for IB use =5400 litres. A minimum Total Vas multiplier of 5 still equals = 2700 litres So your intended IB enclosure is quite a bit undersized. Though it could still function as a large sealed enclosure. Preferably with some stuffing to fool the drivers into thinking it is larger than it is. Though this might exclude normal use of the stairwell. For a sealed box the inflexible concrete will help provided you can achieve a good seal. If there is a door off to another area you could leave that door wide open to provide increased IB enclosure volume when the subwoofer is in use. Though not if it it offers an acoustic shortcut from the back to the front of the IB drivers. |
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Post by paulus55 on Jun 25, 2011 4:11:54 GMT -7
thanks for that info.
Now you have given me some creative ideas. - I will have the opportunity to install a 'cubby hole' door at the rear of the stairwell, which opens up into the study/guest room.
Some experimentation shall happen, firstly use (and testrun) the stairwell as a sealed enclosure, and then play around with the baffle/stuffing setup so that the door can be opened to allow the rear of the drivers to 'air' themselves into the guestroom.
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Post by chrisbee on Jun 25, 2011 5:06:01 GMT -7
Any venting to a third space will require a large opening. A small exit will behave like a port. Resulting in a three chamber, bandpass system of indeterminate tuning. Think in terms of a house door sized vent to the guest room rather than anything much smaller. Only experimentation will prove if the opening is large enough.
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