what size enclosure for these speakers

[sbelyo]

I'm looking to build a pair of desktop speakers with these from parts express.

https://www.parts-express.com/grs-1tm-4-1-mylar-tweeter-4-ohm--292-438

https://www.parts-express.com/peerl...-series-2-midrange--299-008#lblProductDetails

What size enclosure will I need to get it down to 100Hz ? and should I port it and fill it?

 

[vinylkid58]

Both of your links are tweeters. Maybe one should be a woofer?

jeff

 

[ICG]

Both of your links are tweeters. Maybe one should be a woofer?

Both are the same link which makes it the same tweeter. 😉

What size enclosure will I need to get it down to 100Hz ? and should I port it and fill it?

Well, you didn't post the link to the woofer, so I can't answer that. But you can answer it yourself if you enter the TSP in a simulation program like BassCADe or WinISD (Pro) etc. That's the easy part, the crossover is much more complicated.

 

[sbelyo]

Whoops, sorry...

here's the other speaker

https://www.parts-express.com/peerl...-series-2-midrange--299-008#lblProductDetails

I edited the first post as well

 

[vinylkid58]

I'd pick a different driver, if you actually want some bass. Peerless makes some nice little woofers. Is this speaker for the desktop/computer? You may want to consider a single driver if budget is a concern.

jeff

 

[sbelyo]

I already have them on hand and was going to make a set of micro monitors to use at work because space is limited. I was going to use only the woofer speaker but thought using the tweeter would make a nice 2 way micro monitor.

I definitely don't have the understanding to calculate the volume or porting if necesary

 

[vinylkid58]

I already have them on hand and was going to make a set of micro monitors to use at work because space is limited.

The boxes will be tiny, so I'd go ahead and try them in a ported config., and if you don't like them, it's no big deal.

Using WinISD, the box should be approx. .8-.85 liters in volume, with a .5" x .5" x 3.5" long port for a tuning of ~75Hz. Don't forget the driver displaces volume, so you'll have to guesstimate that. If you have some 1/2" ID tube to use for the vent, then it would only be 2.7" long

jeff

 

[sbelyo]

Thanks Jeff, I'll start there

 

[vinylkid58]

Okeedoke.🙂

jeff

 

[sbelyo]

Denovo Audio Knock-Down MDF 0.04 cu. ft. Micro Bookshelf Speaker Cabinet Pair

looks like these will work. Does it matter where I put the port?

 

[vinylkid58]

Does it matter where I put the port?

If the area behind your desk is open, then out the back. If it's not, then out the front. Might not make any difference with something this small.

jeff

 

[planet10]

The Q on this driver makes it hard to get a decent alignment. I fiddled a bit, and i'd suggest 0.7 litre tuned to 95 Hz with a high aspect slot vent. F10 ~70Hz.

Larger gets pretty ugly, smaller has a big peak before rolling off. The 0.7 litre box also has a peak, but it is small enuff to get flattened by the slot vent.

The 1.1 litre box (0.4 ft^3) you suggest getting will need to lose some volume (vent, vent shelf, brace would eat some.

dave

 

[vinylkid58]

Yeah, I like the higher tuning better than the 75Hz tuning, it's a bit ugly. A 2.0" long port would be about 90Hz in a 0.8L box.

jeff

 

[sbelyo]

The 1.1 litre box (0.4 ft^3) you suggest getting will need to lose some volume (vent, vent shelf, brace would eat some.

dave

Would polly fill or eggcrate foam work?

 

[planet10]

That would make the box appear bigger. Rocks would work (or bricks, tiles, blocks of wood).

½" MDF is not a very good material for speaker boxes so tiling the insides with something solid might help there as well.

dave

 

[BeauB]

Here is what Matt from Parts Express suggesting in response to a similar question:

"I would recommend 0.031 cubic feet with a 1/2" diameter, 1.5" long port for a tuning frequency of 100 Hz."

 

[picowallspeaker]

"surfing" thru the P.E. site I discovered this little planar tweeter
https://www.parts-express.com/dayton-audio-ptmini-6-planar-tweeter-6-ohm--275-083
Maybe it could add more "air" or "brightness" than the mylar one.
About Matt's suggestions on how crossing it over, well, the classic 3-4 uF single cap might be a rather semplicistic 🙂

 

[sbelyo]

That would make the box appear bigger. Rocks would work (or bricks, tiles, blocks of wood).

½" MDF is not a very good material for speaker boxes so tiling the insides with something solid might help there as well.

dave

Blocks of wood.... This is a good idea. I have some hardwood flooring scraps I could use or 2.25" piece of a 2x4 would work i think