Building my first cabinet with Peerless drivers

[Howard]

Hi all,
I feel like having a go at building my first speaker cabinets. I have a pair of Peerless SKO 165s taken from an old pair of Floorstanding speakers, and I'd like to build a pair of small cabinets to house them and their accompanying tweeters.

These are the drivers:

Peerless SKO 165 WFR (SH) - Netsound.dk

Specs are here:

Peerless Specs

From what I've managed to work out, a volume of around 11.5 litres is ideal for the enclosure. Can I effectively make the enclosure any shape I wish, i.e. the W/D/H dimensions aren't terribly relevant as long as the volume is considered?

Alternatively, are there any cheap kits available in the UK, which comprise of drivers and cabinets that I could put together myself to familiarise myself?


Thanks for any advice!

 

[Inductor]

Loudspeaker Kits, Stand Mounted Loudspeaker, Floorstanding Loudspeaker, Sub Woofer Kits
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[system7]

I'm not quite clear whether you have the polypropylene or paper versions of that speaker, but for sure you should consider that the original maker kinda knew what they were doing with the original cabinet. So that would be your guide on a box size. 🙂

IMO that is a 90db efficient reflex driver with a Vas around 25-35L, and a Qts around 0.4, Fs near 40Hz. Closed box around 11.5L would be a bit disappointing at the bass end IMO. Reflex beckons near the Vas value around a cubic foot, pretty much just a short tube around 70mm diameter. 😎

Crossover at 3Khz would probably work well enough with Visaton's 8 ohm prebuilt Crossover filter HW 2/70 NG: Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories

You'd be surprised to learn that this simple Visaton TW-70 cone tweeter is used in some very expensive speakers: Visaton TW 70 - 8 Ohm

An externally hosted image should be here but it was not working when we last tested it.

The crossover is quite hard to source in the UK, but Conrad Electronic have it: Conrad Electronic - Europe`s leading electronics and technology online specialist

If you can dig up a broken pair of speakers with a box about 1 cubic foot, you can probably do this all quite easily. I've got very good results from this sort of make do and mend! If you find the tweeter hole is too big, you might also consider this 94mm dome unit:
Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories

Have a go, my friend. 🙂

 

[Netsound]

Volume

Hi Howard.

The SKO 165 were used in KEF Coda 8 Bookshelf speaker and the volume of that box were 14 litre.

If you need more information look at

Netsound.dk

Or write to

info@netsound.dk

 

[Howard]

Hi Howard.

The SKO 165 were used in KEF Coda 8 Bookshelf speaker and the volume of that box were 14 litre.

If you need more information look at

Netsound.dk

Or write to

info@netsound.dk

Useful to know, thank you!

 

[Howard]

I'd like to make them sealed - is this easier from a design and 'sound quality' point of view, as with subwoofers, or is it a whole new ball game with two way speakers?!

 

[Inductor]

I'd like to make them sealed - is this easier from a design and 'sound quality' point of view, as with subwoofers, or is it a whole new ball game with two way speakers?!

EBP is very high in the 80's/90's. system7 refered to that already and asked you if you had the paper cone or the pp, this is, if you can differentiate one from the other. (Some papers are also very shinny). You can test the closed box and find for yourself if you miss the low frequencies, doesn't hurt. Usually works better with lower EBP and special drivers that work on both.

 

[Howard]

Sorry I *think* they're made from PP - I know they're pretty shiny and 'tacky' to the touch but I won't know for sure until I get home from work and dig them out. Is there a sure-fire way of determining?


Regarding the original enclosures - they were taken from a set of JPW Radius floorstanding speakers - these costed £40 new from a retailer called Richer Sounds - they weren't expensive and I dare say not a huge amount of R&D went into their design!?

 

[Inductor]

PP is the polypropylene (thermoplastic) but I am not sure if some early models had the look of the bextrene type (or that's the duped paper) or if (early PP) looks just like late models(?), so no 'tacky to the touch'. If it makes any sense.

 

[Howard]

So does this mean if the rear of the cone has a cardboard appearance, they're paper and not PP?

 

[system7]

It's not really a big deal, beyond that the paper units had a Vas of 25L and the PP were 35L. In fact the JPW Radius looks biggish (what, 30L?) in reflex form, but you are right on the 11.5L maximally flat calculation for the Closed Box. 15L would be OK too on the overdamped end of the range.

PPs were quite distinctive. A rubbery sort of shiny plastic. Paper is stiffer.

 

[Netsound]

SKO 165

What are the name of the speaker you have

 

[sreten]

Can I effectively make the enclosure any shape I wish, i.e. the W/D/H
dimensions aren't terribly relevant as long as the volume is considered?

Alternatively, are there any cheap kits available in the UK, which comprise
of drivers and cabinets that I could put together myself to familiarise myself?

Thanks for any advice!

Hi,

If the original x/o is well designed you should keep the baffle width
moreorless the same. TBH though what is wrong with the cabinets ?

If you want a cheap driver set to go into a ~ 10L sealed box :

Speaker kit 1: ELAC 180JM + Peerless LSQ19 FREE UK P&P | eBay

Also sells and gives details of your bass units :
Peerless SKO165 6.5 inch Hifi bass speaker woofers PAIR | eBay

rgds, sreten.