scanspeak 23w with passive radiator

[philiparcario]

well I had all these parts sitting in my house. the woofer and the radiator since last christmas actually maybe since christmas 2008! So the dayton vinyl sub cabinet came on sale for 75 and the sa240 sub plate came on sale for 99. I built it knowing I would sell it right away. I rather not but I have no room and letting the scanspeaks sit in boxes is just wrong. this is the back baffle attached upside down I penciled in the cutout for the sa240 subplate. the sub is shown with just the woofer cut in third shot . fourth shot has a 1 foot ruler and a picture of the radiator. shot of the installed sub plate. I must say the cutout trace from the back worked well. all this was done on thur. next post is fridays work

[philiparcario]

Re: scanspeak 23w with passive radiator

fridays work. the stripped screw I was asking about. sub is done except for some replacements screws. third shot shows the passive radiator. note foam sheet for sound reflection. if you down fire to a solid surface the foam should help diffuse sound. last shot shows the sub powered up. note the power punch power cord from ps audio. grabbed a few from ps audio on a clear out. this cord lets you unscrew the ground pin in case of hum. so far the sub sounds good but the baffle is a bit loose until I grab a few screws for it. I may want to add more height to the feet since i have a down fire radiator .

[philiparcario]

Re: scanspeak 23w with passive radiator

grabbed a few 4mm pan head 50 mm long from lowes they hold the front baffle fine.

[mgrabow]

Re: scanspeak 23w with passive radiator

grabbed a few 4mm pan head 50 mm long from lowes they hold the front baffle fine.

sweet... bring this to the next NY DIY...

[jakeparsons]

Re: scanspeak 23w with passive radiator

At the risk of showing my ignorance, and maybe someone else can chime in here, but I thought I read once that it is not ideal it mount a passive radiator anyway other than vertical. And, if it is ok for it to be mounted upside down, I think you are right, you definitely need to add some more clearance.

[jakeparsons]

Re: scanspeak 23w with passive radiator

FINALLY... I found where I read it. If you go to Madisound's page and read on the Seas passive radiators, Seas recommends passive radiators only be mounted vertically, especially if much additional weight is added. It does make a little sense to me because the suspension of a passive is at the whim of the active driver and when mounted upside down, gravity will have a little influence on it as well.

[philiparcario]

Re: scanspeak 23w with passive radiator

At the risk of showing my ignorance, and maybe someone else can chime in here, but I thought I read once that it is not ideal it mount a passive radiator anyway other than vertical. And, if it is ok for it to be mounted upside down, I think you are right, you definitely need to add some more clearance.

cone weight and suspension are very lite so the cone should not sink/sag. also the surround is big and a bit stiff.

I can always switch it with the sub and have the sub downfire with the radiator being vertical. Like tire rotation!

I found a way to add height and still look good. I purchased parts from www.mcmastercarr.com


90131A552 = A 2 1/4 INCH WASHER
90131A308 = A 1 1/2 INCH WASHER

Both are 1/8 inch thick. So of each would be 4/8 inch height or 1/2 inch more height. the feet now are 7/8 inch high. it will go to 1 3/8 inch high.

I also purchased longer machine screws.

part number 92005A450


THIS will allow the washers to be added. I played "the other guys" and "the expendables" both were very good but More height will not hurt the sub. Nice sub the sa240 hums on one sound system not the other but the ps audio punch power cord has a removable ground pin this solved the hum. the sub plays really low with the radiator .

[philiparcario]

Re: scanspeak 23w with passive radiator more pics

I wanted to give it a lift for the sake of the passive radiator. I needed longer bolts they were 6mm 45mm long these are 6mm 60 mm long. the rubber washers there are 4 of them about 13.5mm of height was added.

[philiparcario]

Re: scanspeak 23w with passive radiator

last shot shows sub on a rug and radiator clearance. I may cut a wood washer right between the largest rubber washer and the base of the sub. all in all the lifts seem to be helpful. as a side bar I put in a lot of silver screws so that if I rotate the aluminum radiator to make it show the screws will look nice. I also like sliver and black.

[philiparcario]

Re: scanspeak 23w with passive radiator

FINALLY... I found where I read it. If you go to Madisound's page and read on the Seas passive radiators, Seas recommends passive radiators only be mounted vertically, especially if much additional weight is added. It does make a little sense to me because the suspension of a passive is at the whim of the active driver and when mounted upside down, gravity will have a little influence on it as well.

thanks for looking it up. the scanspeak does not need much weight added to it. in fact I am using no added weight. I will look at what you found to see if it applies to the scanspeak.

the seas radiator is tuned to match the L26ROY in a 40 liter box so as it says in the pdf it would need no weight to work with that driver.




{The chart below will show you the mass which has to be added to the cone of the passive radiator in order to obtain the desired Helmholtz resonance frequency in a given cabinet volume.

The SL26R is already matched to our D1001 - L26ROY and a 40 litre cabinet. but it’s also equipped with an M4 screw to which you can easily attach more added mass for
other applications.}



SO if you run it with that sub in that box no weight is added down fire is okay. but if you want a smaller box and add some weight down fire is not ideal. Same would go for the scan speak. proper box size and you would be fine. I glad you looked for it. Now that I read it I feel I am good to go.

[greywarden]

Re: scanspeak 23w with passive radiator

Those Scan Speaker PRs are just beautiful

[philiparcario]

Re: scanspeak 23w with passive radiator

To be honest I like the radiator better then the sub for looks. I am thinking about switching them. In fact I like this sub so much I decided to remove the listing from ebay.

[Mark65]

Re: scanspeak 23w with passive radiator

Definitely nice, Phil, and I would definitely front fire the PR, and down fire the driver. It's just that pretty.


Great work!


Mark

[philiparcario]

Re: scanspeak 23w with passive radiator

This came out very nice.

I have 1 more subwoofer.

One more dayton cabinet.

One more sa240 amp.


I am thinking of making a second one.

I just need to spring for a second passive radiator. If I do this I will replace these in the photo. NHT 1259 subs.