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The building your own portable soundsystem thread

If you're wanting to make a larger profit, use them cos they are cheaper. I'm sure they will sell.
 
Im not building them with the intention of selling, my freinds have asked for some, so I was just gonna do them cost tbh.
 
Depends if they want wheels, or if they like those cheap flight cases, then.

And how much they want to spend.
 
Onket said:
Depends if they want wheels, or if they like those cheap flight cases, then.

And how much they want to spend.
Click to expand...

They just want them for their gardens....... they're not the types whod take them properly out out.
 
Btw those flight cases were shite.

So im doing a carpentry course, and instead of making a bird house, I've been told im good to make a speaker. Im only wanting to use cheap components, as its my first try, and he only wants me to use MDF (bear in mind its a carpentry course, not a speaker building course, I'd prefer to use ply, but as its a short course, would be better practising my skills on somthing cheaper).

Im thinking about using an 8 inch driver (http://www.bluearan.co.uk/index.php?id=SKT902426&browsemode=category), and a 15" driver (http://www.bluearan.co.uk/index.php?id=EVNL042Q&browsemode=category), do you think those will work together well? I imagine it might be a bit bass heavy, but thats good.

Also how big should I build the box? I need to go buy the wood on wednesday as its my only chance, so need to get this decided quickly...... Im going for a straight forward box, no fancy trickery, but if it works out well i might build a second one of these speakers, and a scaled down g sub to go with it.
 
sim667 said:
Btw those flight cases were shite.

So im doing a carpentry course, and instead of making a bird house, I've been told im good to make a speaker. Im only wanting to use cheap components, as its my first try, and he only wants me to use MDF (bear in mind its a carpentry course, not a speaker building course, I'd prefer to use ply, but as its a short course, would be better practising my skills on somthing cheaper).

Im thinking about using an 8 inch driver (http://www.bluearan.co.uk/index.php?id=SKT902426&browsemode=category), and a 15" driver (http://www.bluearan.co.uk/index.php?id=EVNL042Q&browsemode=category), do you think those will work together well? I imagine it might be a bit bass heavy, but thats good.

Also how big should I build the box? I need to go buy the wood on wednesday as its my only chance, so need to get this decided quickly...... Im going for a straight forward box, no fancy trickery, but if it works out well i might build a second one of these speakers, and a scaled down g sub to go with it.
Click to expand...

For a 15inch driver it's not very loud!

I appreciate it's twice the price but here's a soundlab that's nearly twice as loud at the same wattage: http://www.bluearan.co.uk/index.php?id=EVNL041E&browsemode=category

If you're on a budget (who isn't tbh) consider looking at QTX replacement drivers.
 
fractionMan said:
This one is 101db 1w/1m and 4ohms 31 quid: http://www.yourspares.co.uk/manufac...5quot-driver-for-qr15a-178205uk-902519UK.aspx
Click to expand...

Thanks...... Ill probably get one of those then...... so thats the bass sorted.

You reckon the 8 inch driver looks ok? I've been told to think about getting a 1 inch to put in to cover the high's and a crossover....... You think that sounds like a plan?

My main worry is working out how big a box I need to build as I need to buy the wood.
 
Edit: Im a muppet, the QR15 doesnt have a mid in it does it?

So the compression driver and the 15 inch will cover the mids?
 
sim667 said:
Edit: Im a muppet, the QR15 doesnt have a mid in it does it?

So the compression driver and the 15 inch will cover the mids?
Click to expand...

The compression+15 inch will make it full range :) No need for other drivers.

I also linked to an appropriate (4k) crossover above too!
 
fractionMan said:
The compression+15 inch will make it full range :) No need for other drivers.

I also linked to an appropriate (4k) crossover above too!
Click to expand...

The 8 inch will improve the sound quality as it will leave the 15 and the compression free-er to handle the lows/highs though, no?

Basically is going to be the bastard love child of a qr15 and a res 2.

The res2 as it takes the premise of using a 1, 8 , and 15 together, and I'm
Going to base my box on the dimensions of one of those, but square it up so it's easier to build.

The qr15 as I'm using the qr15 parts.

I hope it won't be too quiet.
 
I see what you're trying to achieve but with these drivers the 8" will make the quality worse rather than better. It'll be unbalanced volume wise vs the other two components (which match in terms of output). Your mids will be too quiet. Also the dimensions will be borked by the extra driver.

The horn is designed to handle 4k up. The 15" isn't a dedicated sub, it's a bass speaker that goes from really low > 4k.

With different drivers what you're planning would be good, but it's beyond my ken to suggest which drivers they would be. Note that res2 is bi-amped too.
 
If you want to make something more complicated than what I'm suggesting, I'd say build a boominator but with cheaper drivers.

Or find some other tried and tested plans that take drivers in your budget.
 
right, im thinking i want to keep costs down, so thinking about building and MDF version of this
http://www.speakerplans.com/index.php?id=x15

but thinking about keeping it square at the back, and using the components you've recomended for the QR15 you've suggested.

Then if it needs the mid, I can buy more wood (ply) and make a new cab, then buy an 8 inch, and a 3 way crossover.......
 
if you're going to build something from plans i'd either stick to the plans or get some professional advice on changing em...

those plans of Rog's have been around for donkeys years and are tried and tested, there must be people who can advise on what will happen if you change the shape and size of the box, although i'd suggest just building what he's designed with the right components.

i'd be amazed if it needed a mid, i'd expect it to be pretty loud, with plenty of mid as is and crying out for a pair of subs with a suitable active crossover and amp.

and none of this is going to be particularly portable, especially the amp and power supply.
 
Im well aware of that.

Im am going to use the cheaper components, but im going to try and build the x15 shape....... the problem is im making this in a carpentry course which finishes in 2 weeks, so need to get it together ;)
 
If you work out the volume of the QTX15a cab, you can make a different shaped cab with the same volume to get the same resonant frequency etc.
 
Picked up the wood today, this thing is huge, I hope my carpentry tutor isn't going to be :facepalm: at me. Last week he sai I didn't need screws and wood glue would hold if, but in going to buy screws anyway, I think he was thinking a normal soze house speaker.

Anyway it looks like I'm going to have to cut the speaker holes without havin the speaker to measure. Do you normally cut a hole to the size of a speaker, I.e a 15inch speaker = a 15 inch hole??
 
Got two new flight cases to do. I've got a working space of 26.5x20 cm on the side for the speakers.

I trying to decide what size drivers I should go for? Either stick two three inch ones in or one 7inch?

Oh hang on, the bluearan do 6 inch smallest so I guess that's made a decision for me. I've got ta2020 amp, and I'm in gonna just do one first, so it's just picking the right speaker.

Unless I do a 7 inch in each side, but I'm worried about room inside them....

The big cab is still a work in progress, the cab itself is ready I've just gotta install and insulate it.
 
Could someone help me with some simple wiring questions?

I've built a little boombox. At the moment, the back is off the box that houses the Lepai amp, so I can plug in a mains power adapter, but I've got a housing for 10 x rechargeable NiMH AA batteries making a 12v battery pack with maybe 20 amphours of life in it. I've only just ordered the batteries so I'll see. However, I was thinking that I'd still like to have a socket that I can plug the mains adapter into.

So I was thinking about mounting a DC socket on the back plate, and some sort of switch to select the power source.

1. Does the switch need to be a 3 position one? There's an on/off switch on the front of the amp, so maybe a 2-way switch would be OK?

2. Does the switch need to be some sort of special one because it's switching power. Would something like this one do?

3. The switch has 3 terminals. How do I connect it up? I'll have +ve and -ve from the battery pack, a +ve, -ve, and earth from the DC socket, and a +ve, -ve and earth going to the amp.

...or maybe there's an easier way of doing it?

Thanks.
 
Given up with the big cab, its just too big to be usable, weighs a ton, looks shit and is made out of MDF.

Anyone got any suggestions of what I can do with an 18 inch cone and a 1 inch horn, both 100 watts. There aren't any 12v amps on the market that could drive those properly are there? - (was thinking I could make a wheelie bin, and sell all the old mdf from the cab, bout £50 of untouched mdf and about 30 of used, but usable MDF).
 
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