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24.13.230.11
In Reply to: RE: Subwoofer for Danley SH-50 posted by Frode on August 18, 2012 at 09:11:54
Hi Frode
Personally, I think there are a couple questions who’s answers may point the way.
First, do you intend this to be passively crossed over or will these be driven by separate amplifiers and using a speaker controller (electronic crossover)?
If you’re going to be using a passive crossover, you need to design the lf section around the same sensitivity as the SH-50 and you are pretty much limited to the MTM arrangement (nothing wrong with that).
If you’re going “active” then you have more flexibility as “time” is easy to adjust but the things which govern how two or three sources combine still apply. An MTM arrangement is desirable here too.
If you have a modest sized room and not an “open” home layout, then one can exploit the room gain slope and use a sealed box alignment. If your room isn’t huge (which makes the frequency where this effect happens too low) this arrangement may be your least expensive way to go.
If you have a modest sized room or one that is long and skinny, there is a really cool thing you can try with SH-50’s. AS one can place two of them side by side (angled sides touching) and not produce any audible seam, you can also take one and place it hard angst a room side wall and not produce a refection from the side wall.
This GREATLY reduces the reflected sound reaching the listening position and to a very real degree, makes the stereo image nearly as good as it is outdoors (no room effects). If this turns out to be advantageous in your room, then do try it!
In all cases you want to have the speakers aimed so that the right speaker is pointed at the left most seat on your listening couch and vise versa. Don’t worry about sound reflecting off the rear wall behind the speaker, the radiation outside of the 50 by 50 pattern is much less than any hifi speaker and becomes a non issue.
Anyway, if you end up getting them and can measure the system, I can offer some assistance with a crossover.
Best,
Tom Danley
Follow Ups:
I'm going active. I use Audiolense software for crossover and DSP.
I've attached a sketch of the room. I'll most likely place the speakers where the small green squares are. With 8ft ceiling, I end up with a ~3900 cu.ft room.
Frode
Another try on the sketch.
Frode
Hi Frode
Your room is pretty large (27ft) which puts the knee in the room gain curve around 20 Hz which would make it difficult to make a normal sealed alignment with a corner F at 20 Hz. For a box with the same shape as the SH-50, so far as easy, I think your pretty much limited to a large excursion drivers is a sealed box and eqing the in room result .
If you can devote a larger space a separate subwoofer could be used too but in the ideal world, the upper and lower sources are close coupled like within the sh50..
I would suggest (off the top of my head) that you try the SH-50’s first against your walls and aimed like I mentioned. Against a wall, these will have a rise below about 200Hz because they have flat response in free space and this space at low frequencies is confined by the wall boundary. Because of that acoustic gain , you can eq down most of that rise (if you want) but you can take advantage of the increased level around 40Hz and below which lets the lf response extend part of an octave downward. If you have a good sized power amp, you can eq the lf response and extend it some over the natural response.
Then for a subwoofer system, especially if this is a first construction project, go with a simple cabinet above and below each with one Lab-15 or other good woofer. This should be reinforced internally and if you afford the wood use Baltic birch which is about the strongest plywood readily available.
When you set out to cross these over (I am not familiar with your set up) start with a crossover around 100Hz.
With a sealed alignment, below the knee frequency, you can extend the lf corner with eq, each octave you extend it, requires 16 times more power. All is good until you run out of power, run out of linear excursion or thermal power handling. The subwoofer amps should be AT LEAST several times more powerful than the ones for the SH-50 (the subwoofer will have a lower sensitivity, the lower the corner in its response, the lower the efficiency is).
I think you will have fun with the 50’s they are signal faithful and in a living room will never be breathing hard and so are dynamic and very low distortion. One cool thing you can show your friends is with the grill off, you can walk up and literally put your head in the horn mouth and never be able to tell there was more than one driver. The other is amazing stereo imaging (when in the recording).
Best,
Tom
I see you sell the DTS-10 as a kit again, would that be an good option combined with the SH-50?
Frode
Here ya go:
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