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southernoise 10th October 2011 05:14 PM

Adding a woofer into a Pensil enclosure? FAST project with active crossovers
Would it be possible to add in a mid woofer like a CSS SDX7 or a EL166 to a Pensil enclosure?

I've been experimenting with an ESP Linkwitz Riley active crossover at 300Hz with my Pensil 10.2 handling the higher frequencies with my KT88 SET and a TA2020 digital amp for the bottom frequencies thro an old KEF Cresta 2 bookshelves. I quite like what I hear with the bass reinforcement but will shift the XO frequencies to around 150-200Hz to make use of the Alpair 10.2's excellent mids.

Now what is bothering me is the extra 2 sets of speakers that does not integrate well into the living room and the domestic controller.


planet10 10th October 2011 07:03 PM

You are best to start with an enclosure specific to the application.


southernoise 10th October 2011 07:13 PM

no chance at all to mod the pensils? :confused: i was hoping if it would be an easy add on as space is limited around here.

planet10 10th October 2011 07:51 PM

Trying to reuse the Pensil box would be non-optimal, but could be done if you have a removable back (and left out the holey brace).

You would need to partition of a smallish enclosure for the A10.2 -- i'd suggust about 10 litres. Then modify what is left to accomodate the woofer. SDX7 works nicely in 14-17 litres sealed.

Where you can put a partition is limited to just under the A10, leaving about 20 litres for the A10 and 46 litre for the bass driver.


southernoise 11th October 2011 01:49 AM

Thanks Dave! I've built the pensil with a removable back and without the holey brace. :D

Should I put the SDX7 front firing or side firing like the Tysens? I guess I'll have to cover the Pensil port from the inside.

Can't wait to place an order for the SDX7:D

planet10 11th October 2011 02:11 AM

You will need to decrease the volume of at least the woofer chamber, even if you get 2 per side.

I'd side mount them.


southernoise 11th October 2011 02:36 AM

Yah will need to half the volume for around 17L

How about the EL166 compared to the SDX7. Cost a third of the SDX7. Both are different in construction though.

planet10 11th October 2011 03:13 AM

EL166 is a good woofer, especially of price is taken into consideration. I think the SDX7 is better.


southernoise 11th October 2011 04:27 AM

Thanks Dave. I'll sketch up something tonight and post up for comments.

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