OV9

Just taken delivery of this to power a sub that I'm building into the living room wall:

The teenager in me is very very excited about this

Building it into the wall?!

What is it, Nef? I can’t make out the text around the phase plug.

Hope your have a suitably rigid enclosure! Sounds a bit euphemistic doesn’t it

GG. wrote: Thu Mar 28, 2019 9:09 am What is it, Nef? I can’t make out the text around the phase plug.

Hope your have a suitably rigid enclosure! Sounds a bit euphemistic doesn’t it

Cervin Vega Stroker. the daddy of subs for SPL in the 90's.

Jobbo - Yes hes building an enclosure to sink into the wall space.

Yikes

Do you have neighbours?

He did.

Rich B wrote: Thu Mar 28, 2019 9:30 am Do you have neighbours?

Sorry. What did you say?

Indeed, more specifically it's a Cerwin Vega Stroker 12D2 - the daddy of all subs. Dual coil, rated to 1000W RMS per coil.
Back in the day, a suitably boxed and amplified single one of these in a car install was enough to potentially crack a windscreen. However, back in that same day, they were a grand a pop so way out of my budget for car system builds.

As for the install - here a pic of the cavity its going into (bottom triangle):


The cavity is brick on three sides (none of which are party walls), and I've fully lined it with acoustic board. I've gone to town on the framing structure of the two cavities above to give maximum rigidity. I was originally designing a 6th order bandpass box, but have now settled on a more simple ported box (still over 100L in volume!), which is both easier from a design and packaging point of view, but should also create less radiated sound. Plus, I don't really need the additional db lift from the bandpass box

I only have one neighbour, and she's quite understanding (although the line might be drawn at structural damage to the building )

Let us know when you set up that crowdfunding page for hearing aids

The new system will be:
Yamaha DSP-E800 processor/amp
Arcam Alpha 9 integrated amp
Arcam Alpha 9 power amp
Cambridge audio A3iamp
B&W 602s (Front)
B&W 603s (Rear)
Polk Audio RD65i in wall speakers (front sides)
12" Stroker-based sub
KEF centre speaker

The Cambridge Audio amp is just temporary until I can figure out a suitable crossover to allow me to run the sub and the Polks off the same amp

Back in the 90s my mate inherited a pair of CV floor speakers, each the size of an undercounter fridge. They were LOUD.

Hadn't heard of CV back then, but they blew my mind. Nothing I'd ever heard before could compare.

I had Jamo D266’s - Awesome sound but way too big and ultimately superceeded by much smaller speakers that could do the same Job

Dance Music loved them though

Nefarious wrote: Thu Mar 28, 2019 5:46 pm The new system will be:
Yamaha DSP-E800 processor/amp
Arcam Alpha 9 integrated amp
Arcam Alpha 9 power amp
Cambridge audio A3iamp
B&W 602s (Front)
B&W 603s (Rear)
Polk Audio RD65i in wall speakers (front sides)
12" Stroker-based sub
KEF centre speaker

The Cambridge Audio amp is just temporary until I can figure out a suitable crossover to allow me to run the sub and the Polks off the same amp

Presume your using the sub out from the Yamaha to the Cambridge?

Nah, the Yamaha runs the KEF and the 602s, the power amp runs the rears, and the integrated runs the sub (bridged). For the moment, the Cambridge will run the Polks. Still deciding whether to use a crossover to run polks and sub off the integrated (would need one with a variable gain control on the high end), or to run separate high and low pass filters and run them independently. The latter way gives more control, and allows a bit of an overlap at the crossover point (say, cut the sub at 150Hz, but allow the Polks to go down to 120), but is probably going to require an extra amp in the stack (and TBH, the Cambridge isn't really up to the standard of the other kit).

Nefarious wrote: Thu Mar 28, 2019 11:04 am Dual coil, rated to 1000W RMS per coil...

<snip>

Still deciding whether to use a crossover to run polks and sub off the integrated (would need one with a variable gain control on the high end), or to run separate high and low pass filters and run them independently.

I'm going to hazard a guess you need something MUCH beefier than the A3i to run that sub !

Sundayjumper wrote: Fri Mar 29, 2019 8:40 am I'm going to hazard a guess you need something MUCH beefier than the A3i to run that sub !

Damn straight! Even the AA9 fully bridged up and dedicated just to the sub is barely going to be tickling the sides.
I'll suck it and see, but I think I'm going to be limited by the balance before I run out of sub power. If not (and I'll be very happy to be wrong), I'll just throw another chunkier amp at it.
As I say, I have no intention of the Cambridge staying long term.