Single Speaker Crossover

[Tracti]

Hey all New to the forum, been looking but I carn't find solid information on this. If I was to run a single full range speaker would I need any Caps/resistors/coils etc. Just want to make up some small surround speakers for my computer setup and was looking at something like this
Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm - Full Range - Loudspeaker Drivers By Type - Loudspeaker Components
Thanks in advance

 

[Scottmoose]

You won't need a crossover if it's to be run sans any additional drivers. You may (as in 'may') want to look at Eq -a shelving filter, notch-filter or similar, but these are not mandatory & circumstance dependent. For a computer setup with the linked driver, assuming the data to be accurate, I probably wouldn't bother.

 

[roflynn]

How complicated do you want to make it?

For a computer I agree it is probably overkill to do anything other than plug it into a box and leave it at that.
If you want to overcomplicate things: computer speakers tend to have limited bass and making a linkwitz trasnform to boost the bass, or perhaps add a second driver per channel and tune one to cover only the bass in a 1 1/2 way system might give a result worth trying if that is your idea of fun.
If this is your first entry into speaker building then just building a box is probably reward enough.

 

[Tracti]

Thanks for the quick replies, Sorry about the limited information. I have a Sony 5.1 amp which I have hooked up to my computer. I have been modifying a pair of very basic shelve speakers with great success thanks to this forum and AllenB's great write up on intro crossovers.

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So I thought I would do alittle more on the home build front and make some speakers to use as surrounds. As for my first speaker build Yes, made plenty of sub boxes for cars and even some for home speakers but never the complete. But I have alot of ideas on the cards

 

[vacuphile]

The speakers you are looking at are very nice, and in theory you can run them full range, but in practice you wouldn't like to do that. It is better to cross them over at around 3KHz to a small tweeter for best effect.

 

[xrk971]

If your Sony 5.1 amp is already sending out high-passed signal (no bass content as handled by sub) then you probably don't need anything. If the speakers sound overly bright, it may be due to baffle step fall-off. For a small cabinet and how close you have them to walls this may be a larger or smaller effect. You may want a shelving filter as Scottmoose pointed out, sometimes called a Baffle Step Compensation (BSC) circuit. This consists of a inductor and resistor in parallel and tied in series between your amp and +ve lead of the driver. Typical values are in the 0.5mH to 1mH and 3ohms to 10ohms for the resistor. There are on-line BSC calculators that let you estimate this. You can also do this digitally via EQ in the computer.

Not sure if you have already bought the drivers but you might want to try these as they sound really good - (probably can't be beat in this price range or even 3x higher). Vifa TC9FD - for surrounds use in a 3 to 5 liter sealed box stuffed with polyfill.
Good luck!

 

[Squeak]

If you only use them with the computer then just use the EQ to correct the problem. Much better and more flexible than a speaker level filter in this case.

 

[planet10]

The speakers you are looking at are very nice, and in theory you can run them full range, but in practice you wouldn't like to do that. It is better to cross them over at around 3KHz to a small tweeter for best effect.

If that is truly the case then he should look at a better driver that does not need a tweeter. Adding an XO where you suggest ruins the wholepoint of a FR and for near field use reduces the ability of the speaker to integrate.

dave

 

[sreten]

The speakers you are looking at are very nice, and in theory you can run them full range, but in practice you
wouldn't like to do that. It is better to cross them over at around 3KHz to a small tweeter for best effect.

Hi,

There is no point buying such a small driver and then
adding a tweeter, its destroys the point of it being small.

It will probably be fine stuck in the room corners
as a rear surround speaker pair with no EQ.
I'd consider a triangular box (plan view)
for the job, about 1L, sealed and stuffed.

But for nearfield computer use, where do you put
the rears ? Freespace on tall stands ? I've never
considered more than 2.1 for nearfield use.

rgds, sreten.

 

[chrisb]

slightly OT, but I'm waiting to read the ad copy for Dolby Atmos headphones 😀


Sreten - couldn't agree with you more - a decent 3 or 4" FR driver for computer might not even need the .1 channel - for me "nearfield" and home theatre/surround are contradictory.

 

[Tracti]

thanks for all the ideas but I think I'll go with Sreten small enclosure, sealed and stuffed and see what happens. As there only going to be used for the effect think this should be ok. As for where there mounted, they will be on the underside of the table edges, to start then they may end up on the desk behind me.

 

[vacuphile]

I have extensively worked with the Aura version of this speaker, which is basically the same. The full range mantra imo lacks a foundation in fact to begin with, but in this particular instance, if you want to work with this speaker, make it a two way with BSC.

 

[Tracti]

what's a BSC?

 

[vacuphile]

Baffle step compensation. Higher frequencies get reinforced because the baffle directs them forwards, simply put. The lower frequencies 'fold around the enclosure', so they have to fill more space. Therefore, you have to attenuate the higher frequencies.

One way to correct this is by putting a coil with a resistor in parallel in series with the driver. This driver is no good without it.

 

[Tracti]

ok thanks mate will look it up, have to make the decision to whether to make it a small 2 channel or a single setup. May look at other drivers too