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Multi-Way Conventional loudspeakers with crossovers

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Old 5th June 2004, 12:44 AM   #1
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How much do speaker spikes improve on sound for a homemade sub?

What else can i do to a completed sub to make it sound even better?

Any other tips on making subs (i am half way through making one just now) will be appreciated.
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Old 5th June 2004, 01:22 AM   #2
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Ooer! don't use those things. What you want for bass is either very solid contact, or total isolation. If you have a concrete floor, just stick the box on the floor, preferably with something heavy on top of it, like a concrete paving slab. This will not make your neighbours happy, because the whole building will then be coupled to the subwoofer. You will like the sound a lot though! Good solid bass is best achieved this way. In actual fact many custom installers actually cast concrete enclosures into the floor to get incredible bass. The other solution is to rest the sub on a paving slab with a sheet of Rockwool 6 (high density rockwool) on top of it and the sub on top of that. This will also give you good bass response, and be much nicer for your neighbours. Spikes are not very good because they transmit sound, think of the childhood paper cups and string telephone or a violin soundpost. This means the floor resonates, producing colouration and vibration. On a non resonant floor surface, the fact that the bottom of the cabinet is not touching the floor will mean that the bottom panel will resonate, introducing colouration. On the other hand some people like colouration and it is one of those matters of taste. But generally most people like good effortless sounding clean bass, not rumbly one note thumper bass (which is coloured). Those pin things are one of my pet hates. I can hear very little difference with them on or off, except on thin wooden suspended floors (on which you definitely have to use a rockwool pad)
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Old 5th June 2004, 01:27 AM   #3
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Oh yeah, here's a tip. Use an amp that has about double the RMS (Watts) capability of the speaker that you are using. Good bass is all about having plenty of power without any distortion. Just make sure you don't turn it up to the maximum level or you will smell burning. Amps overdriving sound awful and are the main cause of speaker failure.
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Old 5th June 2004, 01:28 AM   #4
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What is your recommendation for a concrete floor with carpet?
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Old 5th June 2004, 01:31 AM   #5
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A fairly simple way of checking if you like the suspended solution, is to buy a small inner tube and inflate it adequately to carry the sub. Its not pretty but it gives you a hint about what is needed for your secific application. I have such a small inner tube from a wheel barrow laying around. Whenever I set up something in a new place, I give it a shot. Its much easier than making the whole thing with rockwool and so forth without even knowing that its what you want.

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Old 5th June 2004, 02:56 AM   #6
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A good Cabernet will get another 1/2 octave out of them
without an increase in distortion. DIY Cabernet will get
a full octave.
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Old 5th June 2004, 03:46 AM   #7
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Old 5th June 2004, 07:39 AM   #8
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Make sure the sub is well braced and ductseal the woofer basket.

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Old 5th June 2004, 02:56 PM   #9
markp is offline markp  United States
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Default USE THE SPIKES!!!!

If you want to couple the sub to the ground USE THE SPIKES. The one who said that a sub sitting on the floor couples it to the floor is WRONG.
The spikes take the weight of the whole sub and put it on tiny high pressure points coupling it to the floor. Without the points the sub sits with its weight being distributed over the entire surface area which does not couple it to the floor with any pressure. Use the type of spikes that screw into the cabinet not the floating type for best results.
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Old 5th June 2004, 02:58 PM   #10
markp is offline markp  United States
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That rumbly one note bass comes from a woofer just sitting on the floor free to move about, not one coupled with spikes. On carpeted floors the spikes go right through to the solid subflooring to do the job.
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