Bringing 828 cabs up to snuff...

**alancohen** · June 21st, 2013, 10:21 PM

Originally Posted by GM

Looks like way too much damping, so maybe lower than the sim, but otherwise it should be down around/at driver Fs [~25 Hz], which is where it needs to be if driven with a high output impedance.

Thanks, GM. I was actually going to put in more damping, but stopped myself.

The amp I'm using has an output impedance of .8 Ohms.

GM · June 21st, 2013, 11:22 PM

Then tune it wherever it sounds best.

GM

**alancohen** · June 23rd, 2013, 11:58 AM

Well that didn't take long...

I guess I need to make some grilles. Or another A7 cab for the cat.

**Altec Best** · June 23rd, 2013, 12:55 PM

Originally Posted by alancohen

Well that didn't take long...

I guess I need to make some grilles. Or another A7 cab for the cat.

Or just crank it up !

**Audio_by_Goodwill** · June 23rd, 2013, 01:05 PM

Originally Posted by alancohen

I guess I need to make some grilles. Or another A7 cab for the cat.

How about putting something on the backside of the port? That way the cat can't go through, and you don't spoil the view.

**alancohen** · June 25th, 2013, 12:37 PM

One advantage of A7s on wheels and a sliding door in your listening room...

GM · June 25th, 2013, 01:58 PM

Right on! My former home is on a corner lot of a short cul-de-sac and back then ['70-'75] it was a new subdivision full of < early 30s couples, most with young kids, so we would put the A4s up against the house's brick wall at each end of the concrete patio for weekend 'block' parties that drew folks from surrounding areas and even passersby from the main highway ~ 1.5 mi. away. The downside was I 'lost' one way or another quite a few pristine 'keepsake' 45, LP recordings dating from 1940. The few do their best to ruin it for the many.

Fabulous fun times otherwise though, really miss them.

GM

**sanhanul** · June 25th, 2013, 06:21 PM

Look nice !!
BTW what is the model of the horn and HF driver? I am thinking to put Altec drivers to my Klangfilm cabinets which I procured by chance years ago and idling with no specific plan yet. The horn in the picture seems to fit to my Klangfilm cab.
One other. Is it O.K to match 1285 network to 515s? It is 8 ohm to 15 ohm, isn't it?
IMG_20130626_070521.jpg
San

**alancohen** · June 25th, 2013, 07:07 PM

Originally Posted by sanhanul

Look nice !!
BTW what is the model of the horn and HF driver? I am thinking to put Altec drivers to my Klangfilm cabinets which I procured by chance years ago and idling with no specific plan yet. The horn in the picture seems to fit to my Klangfilm cab.
One other. Is it O.K to match 1285 network to 515s? It is 8 ohm to 15 ohm, isn't it?
IMG_20130626_070521.jpg
San

It looks like the opening in your cabs are too big for a direct fit. The horns are MRII564s. They're 12-3/4" wide and 13" high overall.

As far as the crossover, I have no idea. Better minds than mine might know the ramifications of using an N1285 with 515Bs. I have a pair of N801-8As, but one needs repair. It's on the list.

I'm really thinking hard about bi-amping them anyway.