my little speakers

baggins · 10th January 2006, 06:06 PM

Ive just put together some small speakers using a 5" ex-wharfedale
diamond 6 bass /mid :- qms=2.7, qes=0.57, qts=0.47,mms=7.48, cms
=1.05, vas=9.05, fs= 56.7 hz. At the moment there in tiny I.B. 13" x 7"
x 6" boxes and sound incredible for their size .My question is would it
be worth porting such a tiny box?

sreten · 11th January 2006, 09:06 AM

Hi,

its the internal volume that counts.

/sreten.

baggins · 11th January 2006, 11:27 PM

Thanks for the info,

If I interpret the graphs correctly does this mean that the -3db
point for the 3 situations is as follows :-

I.B. - 90 hz
ported box (this size tuned to 40) - 70 hz
ported box (twice the volume ) - 60 hz

I hope Ive understood this and if so how would I determine the port dimensions to achieve the 70hz , -3db case.

Thanks so much for your help!

sreten · 12th January 2006, 09:33 AM

Hi,

probably best to tell me the actual internal volume of your speakers.

Giving you the port dimensions for a 7 litre cabinet is not accurate.

/sreten.

baggins · 12th January 2006, 11:10 PM

Hi ,

I guess 5.8 litres allowing for the volumes of the drive units.

Bill.

sreten · 13th January 2006, 08:56 AM

Hi,

the point of reflexing is getting very marginal with 5.8 litres.

However for 40Hz a 25mm inside diameter vent is 14cm long, 30mm - 20cm.

/sreten.

richie00boy · 13th January 2006, 09:05 AM

25mm diameter is pretty small for that size of drive unit, but tuned that low it might be fine.

However, accomodating a vent of that length in such a small box will prove interesting

Probably have to find some 90 degree elbows, or careful splicing of the pipe as I think 25mm joints are rare?

sreten · 13th January 2006, 09:21 AM

Hi,

Personally I wouldn't reflex them, if anything I'd add a mini sub (or two).

90 degree bends in ports are a very bad idea.

A far better solution is a flexible tube with a gradual curve,
e.g. the output hose from a washing machine / dishwasher.

/sreten.

richie00boy · 13th January 2006, 09:43 AM

Wouldn't the serrations on the washer hose cause turbulence?

sreten · 13th January 2006, 10:58 AM

Well you do get a B&W "flowport" on the cheap,

/sreten.

10th January 2006, 06:06 PM	#1
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	my little speakers Ive just put together some small speakers using a 5" ex-wharfedale diamond 6 bass /mid :- qms=2.7, qes=0.57, qts=0.47,mms=7.48, cms =1.05, vas=9.05, fs= 56.7 hz. At the moment there in tiny I.B. 13" x 7" x 6" boxes and sound incredible for their size .My question is would it be worth porting such a tiny box? __________________ heretics are sometimes right

11th January 2006, 11:27 PM	#3
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	my little speakers Thanks for the info, If I interpret the graphs correctly does this mean that the -3db point for the 3 situations is as follows :- I.B. - 90 hz ported box (this size tuned to 40) - 70 hz ported box (twice the volume ) - 60 hz I hope Ive understood this and if so how would I determine the port dimensions to achieve the 70hz , -3db case. Thanks so much for your help! __________________ heretics are sometimes right

12th January 2006, 11:10 PM	#5
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	Hi , I guess 5.8 litres allowing for the volumes of the drive units. Bill. __________________ heretics are sometimes right

13th January 2006, 09:05 AM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	25mm diameter is pretty small for that size of drive unit, but tuned that low it might be fine. However, accomodating a vent of that length in such a small box will prove interesting Probably have to find some 90 degree elbows, or careful splicing of the pipe as I think 25mm joints are rare? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

13th January 2006, 09:43 AM	#9
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Wouldn't the serrations on the washer hose cause turbulence? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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12th January 2006, 09:33 AM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, probably best to tell me the actual internal volume of your speakers. Giving you the port dimensions for a 7 litre cabinet is not accurate. /sreten.

13th January 2006, 09:21 AM	#8
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Personally I wouldn't reflex them, if anything I'd add a mini sub (or two). 90 degree bends in ports are a very bad idea. A far better solution is a flexible tube with a gradual curve, e.g. the output hose from a washing machine / dishwasher. /sreten.

13th January 2006, 10:58 AM	#10
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Well you do get a B&W "flowport" on the cheap, /sreten.

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