New speaker project

**Reid Malenfant** · 07-10-2011, 20:21

Ok, with a 6.5cm diameter port you can tune down to about 23.5Hz in that enclosure, but using any normal 12" cone the port velocity will be too high & you'll get compression & distortion (chuffing) at high volume levels

I'm assuming a 55L enclosure due to volume loss of the bass driver, port & midrange enclosure needed.

Still work to be done though, so don't give up for an instant

**Dingdong** · 07-10-2011, 20:26

The alternative could be to go with a bigger 'ole or block it up. It's round the back so I wouldn't notice it.
My room is only 3x4m if that is any help.

**Reid Malenfant** · 07-10-2011, 20:32

I have learn't that room size really doesn't matter

I happily reproduce 15Hz in a 4 x 4m room with no boom at all

I'm sure Dave (synsei) will back that up, he was here hearing it & feeling it a few days ago

Blocking it up would be one way of increasing your choices of driver, but don't give up yet

It's very early days & i'm the only poster so far

**Dingdong** · 07-10-2011, 20:36

Once up and running they probably would need to be placed close(ish) to the wall. The cats like a good swing now and then.

**Reid Malenfant** · 07-10-2011, 20:39

Originally Posted by Dingdong

Once up and running they probably would need to be placed close(ish) to the wall.

So you need a low Q driver with a rolling off response so that room gain kind of equalises it...

Cats

They are fun...

**Dingdong** · 07-10-2011, 20:51

Okay, I'll have a search round for one of them. I'd also need a mid that did from 100hz up to approx. 4-5khz as well wouldn't I?

Cats are less fun when you wake up to entrails left on the living room floor.

**Reid Malenfant** · 07-10-2011, 20:54

Yes

This might be the most important driver in certain respects, but if you are willing to go active between the bass & bass/mid then you open up lots of opportunities.

**Dingdong** · 07-10-2011, 20:58

I've read the thread on what you did with the active crossover. Sounds interesting and makes things more flexible. Could it be set to crossover at 150,3k and 13khz for the 4 drivers or would a modern tweeter, such as the Vifa xt25 possibly the way to go?

**Reid Malenfant** · 07-10-2011, 21:37

I used to use an active xover between the bass & lower mid & the lower mid & the rest of the drivers were fed by a standard Yamaha NS1000 crossover. I just needed to select a driver that'd match as much as possible the NS1000 bass so i split it four ways... Active below 110Hz & driven by another amp into the original Yam xover above 110Hz.

Not as easy at it sounds, but not impossible. It took time to find a driver that'd match as near as possible the reactance of the Yam 12" at the xover frequency of 500Hz & the sensitivity.

**Dingdong** · 07-10-2011, 21:51

Wouldn't it be possible just to use the active crossover for all 3 or 4 drivers?

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