Tubes

A place for DIY project discussions.
jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Tubes

Unread post by jimbob »

I’m thinking 355mm mdpe gas pipe. Wall thickness of approximately 20mm. Capped off at the bottom with 25mm plywood. A plywood insert at the top with a cut out for the bass driver. I haven’t decided on the length of the tube yet. A hole cut in the front for the tweeter and one in the side for the midrange.
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Re: Tubes

Unread post by jimbob »

To make things simpler it could just be a 2 way using the 8 inch and a tweeter. Should be fairly heavy as it is but a cylinder could be lined with lead to add mass...
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Re: Tubes

Unread post by jimbob »

I also like the idea of these as an upward and downward firing 3 way. 700mm long tube, partitioned off half of its length. 6.5/8 incher upfiring and 12 incher mounted on the bottom firing downwards. Tweeter in the front of the top chamber. This design would need custom built stands...
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

OrangeFixie
Posts: 62
Joined: Sat Apr 29, 2017 6:25 pm
Location: Bristol, UK.
Has thanked: 7 times
Been thanked: 20 times
EUROPEAN_UNION

Re: Tubes

Unread post by OrangeFixie »

Could you make 3 legs for each speaker that screw or bolt onto the outside of the pipe? Easy to experiment with hight then... I remember my Dad made a pair of speakers (when I was a kid) from chimney pots with an upward facing driver in each one. He always said they sounded good, looked weird in the sitting-room though!

jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Re: Tubes

Unread post by jimbob »

Yeah there are a couple of ways of mounting the legs, it should be pretty straight forward. I can’t see why these shouldn’t sound good but I guess it’s a case of suck it and see!
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

User avatar
karatestu
Posts: 5945
Joined: Sun Jan 08, 2017 4:40 pm
Location: North Yorkshire
Has thanked: 1865 times
Been thanked: 1378 times
Great Britain

Re: Tubes

Unread post by karatestu »

You won't know til you try :epopc:

As with all things the best way is to do it yourself and find out (and learn something along the way) rather than take the word of some one else as fact. It is the journey which is important / exciting as well as the end result. :dance:
DIY FREE ZONE

jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Re: Tubes

Unread post by jimbob »

Absolutely! Half the fun is in trying ideas out! I’ve emailed a couple of pipe manufacturers to see what the costs involved are. I’m struggling to find anywhere online with that diameter pipe in stock. I will persevere!
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

jimbob
Posts: 716
Joined: Wed Sep 26, 2012 8:35 pm
Has thanked: 22 times
Been thanked: 22 times
Great Britain

Re: Tubes

Unread post by jimbob »

I’ve ordered a 1m length of 355mm HDPE with a 22.1mm wall thickness. This should be plenty for 2 speakers. I just need to decide on the length for each speaker. I will be using the 8 inch and a tweeter as I have the ability to compare these directly to the Cube 1. I will probably be lining them with lead for some added mass. That’s it for now until I collect the pipe early next week. I will update once I’ve collected it.
Squeezebox Touch - Cambridge Audio Azur (pre) - Mycetias 250A Power Amp - Mycetias V2 Speakers

Daniel Quinn
Posts: 8586
Joined: Thu Jul 12, 2012 7:16 am
Has thanked: 24 times
Been thanked: 399 times

Re: Tubes

Unread post by Daniel Quinn »

Lead is soft.
. It will therefore attenuate certain frequencies. Ie. It will act as a damper

User avatar
karatestu
Posts: 5945
Joined: Sun Jan 08, 2017 4:40 pm
Location: North Yorkshire
Has thanked: 1865 times
Been thanked: 1378 times
Great Britain

Re: Tubes

Unread post by karatestu »

How are you going to cut out the holes for the other driver(s) in the curved sides of the tube ? Are you sure it will work ?

If it was me i would be cutting a smaller diameter section of pipe that could go on the front of the large pipe with the open end at 90 degrees. That additional bit of pipe would need to be cut with curves to follow the outside of the larger pipe. Not sure that will make any sense but to me.
DIY FREE ZONE

Post Reply