Hello,
I am considering a woofer (not sub) which has dual voice coils of 7.5 ohm each and spl of 88dB. This is for use down firing in a clamshell isobaric arrangement for space saving reasons only with low pass at 250 ohms.
If I wired each driver's two coils in series (15 ohms) and then wired the two drivers in parallel, a 7.5 ohm load would be the result.
Would this give me the same spl as when using a single voice coil woofer which had the same sensitivity of 88db and the same 7.5 ohm Re ?
Many thanks.
I am considering a woofer (not sub) which has dual voice coils of 7.5 ohm each and spl of 88dB. This is for use down firing in a clamshell isobaric arrangement for space saving reasons only with low pass at 250 ohms.
If I wired each driver's two coils in series (15 ohms) and then wired the two drivers in parallel, a 7.5 ohm load would be the result.
Would this give me the same spl as when using a single voice coil woofer which had the same sensitivity of 88db and the same 7.5 ohm Re ?
Many thanks.
I'd be asking whether or not this changes sensitivity....Spl is not governed by sensitivity/resistance... Spl is governed by excursion, surface area and power....so with your isobaric, Surface area of the isobaric, to the outside of the cabinet, is equal to the single woofer, of the same size. Thus spl character is basically the same, as for spl per excursion. I do think that isobaric has better performance in the terms of power compression, and it shows in the lower spectrum where excursion is higher. As far as where you'll be landing with sensitivity.....no idea lol
Isobaric only needs 0.5 the volume in comparisson with a normal clossed box.
Spl is the same as 1 spreaker.
If you want more spl, you just use both speakers outputing in your room. Dsp is a good solution if the volume of your box gets to big.
Spl is the same as 1 spreaker.
If you want more spl, you just use both speakers outputing in your room. Dsp is a good solution if the volume of your box gets to big.
With the sensitivity changing according to the size of the box (ie, we're not making an apples-to-apples comparison) below ~100Hz, I'd say the only way to answer this fully would be to fire up a simulator and see how the graphs look.
Any chance you've got the Thiele-Small parameters?
Chris
Any chance you've got the Thiele-Small parameters?
Chris
I think the answer is 'no'.
But what is your question exactly? Do you want to know max 'undistorted' output in SPL at 1m free space or half space, or do you want to know SPL at 1m free space or half space at 1W electric power applied, or do you maybe need the same SPL at 2,83V to the driver?
But what is your question exactly? Do you want to know max 'undistorted' output in SPL at 1m free space or half space, or do you want to know SPL at 1m free space or half space at 1W electric power applied, or do you maybe need the same SPL at 2,83V to the driver?
Thanks for the replies.
I am wanting to try and match the output of the woofers in isobaric to a mid driver.
The woofers are Monacor SPH-170TC
MONACOR: SPH-170TC
They are max flat in 16 Litres but I only have 9 Litres to work with hence the idea to use clamshell isobaric to keep to qtc 0.707 and wiring the drivers in such a way as the final load is 7.5 ohms.
I am wanting to try and match the output of the woofers in isobaric to a mid driver.
The woofers are Monacor SPH-170TC
MONACOR: SPH-170TC
They are max flat in 16 Litres but I only have 9 Litres to work with hence the idea to use clamshell isobaric to keep to qtc 0.707 and wiring the drivers in such a way as the final load is 7.5 ohms.