Altec 604s "built" into a Bookshelf?

**VolvoHeretic** · November 7th, 2011, 10:56 PM

Encyclopediabsh, if you want, I will be more than happy to draw your situation out in CAD and give you a cut list for the angled front baffle. We just have to keep the angles in increments of 5 degrees so that they are repeatable.

Something like this;

or maybe like this;

or if you want the 5d veiw of our 4d universe, then something like this;

Or maybe the undiscovered Hudson Bay impact crater, the largest asteroid crater on Earth;

**Encyclopediabsh** · November 7th, 2011, 11:26 PM

Thanks again to everyone to suggestions. I'm going to order the GPA 604 III, build the baffle, and see what happens - will post results, good or bad...

**cradeldorf** · November 8th, 2011, 02:26 AM

Hope I'm not sticking my head out but I think an onken alignment would look kinda cool in there.

**cradeldorf** · November 8th, 2011, 02:27 AM

Originally Posted by Encyclopediabsh

Thanks again to everyone to suggestions. I'm going to order the GPA 604 III, build the baffle, and see what happens - will post results, good or bad...

It's pretty hard to make these speakers sound crappy....really hard!!!!

GM · November 8th, 2011, 07:23 PM

Originally Posted by cradeldorf

Hope I'm not sticking my head out but I think an onken alignment would look kinda cool in there.

Indeed, though one loses the advantage of 1/4 WL TL loading that damps the vent in a high aspect ratio cab.

Speaking of which, for smoothest response, ideally the vent [if used] should be down near/at the bottom of the baffle with the driver down from the top at the i.d. height dimension x 0.349, so where is this in relation to the average seated ear height?

GM

**Encyclopediabsh** · November 9th, 2011, 08:02 AM

VolvoHeretic - thanks for the offer - I will take it. Am currently traveling on business but will measure and post Friday.

GM - I'll measure the seated ear height as well and post Friday.

Thanks again to everyone for assistance - I am going to need it!

**Encyclopediabsh** · November 11th, 2011, 10:55 PM

Attached is a more detailed picture of my listening room. My ears are ~ 45 inches from the floor at listening position. I sometimes listen from LP1 and LP2, both denoted on the drawing. Questions please:

1. The speaker "cabinet" size is 20" W x 23.5" D x (adjustable). Per attached, please note the base begins 9" from the floor. GM had suggested 11.7 cu ft, which would make height ~41?. Is 11.7 cu ft still the volume to shoot for, or should I go with the 9 cu ft volume suggested by GPA?

2. If volume is 11.7 cu ft, what is the suggested vent size(es) for correct tuning?

3. What would be the correct placement for driver and vent(s)?

4. Using GM?s formula of (0 .349 x Height) + 9 in = 45 in, Height would need to be ~55 inches high, which is too tall for the application...

Thanks again for everyone?s assistance.

**omodo** · November 11th, 2011, 11:47 PM

Originally Posted by Encyclopediabsh

Attached is a more detailed picture of my listening room. My ears are ~ 45 inches from the floor at listening position. I sometimes listen from LP1 and LP2, both denoted on the drawing. Questions please:

1. The speaker "cabinet" size is 20" W x 23.5" D x (adjustable). Per attached, please note the base begins 9" from the floor. GM had suggested 11.7 cu ft, which would make height ~41”. Is 11.7 cu ft still the volume to shoot for, or should I go with the 9 cu ft volume suggested by GPA?

2. If volume is 11.7 cu ft, what is the suggested vent size(es) for correct tuning?

3. What would be the correct placement for driver and vent(s)?

4. Using GM’s formula of (0 .349 x Height) + 9 in = 45 in, Height would need to be ~55 inches high, which is too tall for the application...

Thanks again for everyone’s assistance.

LP/ear height of 45" (1150mm) seems a little high? I'd expect around 37" (950mm) to be about norm

With a 41" long cabinet, and driver at .349 down that puts the driver at around ~36" by my calcs, so just about perfect. Out of curiosity what is the tweeter height of your ANs in their current setup?

I've also got 604s in ~11cu.ft cabinets, and the same amp, great combo. I believe 250k is the input impedance, not sure on exact output impedance as it's a SEP design and would depend on Shindo's implementation (feedback, opt, etc), could be worth sending an email to check. I have been meaning to for a while just not got 'round to it

**VolvoHeretic** · November 12th, 2011, 12:31 AM

Nice drawing, i will draw it out in AutoCAD, but that doesn't matter other than baffle alignment. Once we have have the internal volume established I can draw out the piece cut list to the millionth of an inch.