Small Room: 604's, 14's, or 19's?

GM · July 10th, 2012, 07:22 PM

A 604's XO point is well above the cab's 'sphere of influence', so has no bearing on its design/performance. The baffle area OTOH affects baffle step diffraction requirements [if any], but as long as the XO is adjustable it can usually be dialed in. Worst case, additional series resistance may be required if a very narrow baffle is used, so the rule-of-thumb is to maintain the same [or larger] baffle width as the cab the speaker was 'voiced' in.

GM

**gortnipper** · July 10th, 2012, 07:32 PM

Do you know what baffle width the 604 was originally voiced with?

**stlblue** · July 10th, 2012, 09:22 PM

Originally Posted by gortnipper

Sorry - I cant give you any meaningful advice about those xo's, but they should work fine in GM's speaker design, I would think. I would think that there may be diffs in the sim with a 604E vs. a GPA 604-8H-III, but he would know far better than I. But you would need the series-R.

I did find this: Thiele Small Parameter measurement question for a 604E. I'm going to lean on a buddy to get them built correctly. Needless to say, I'm going to just keep the 604E's. Thanks for all your help.

GM · July 10th, 2012, 09:25 PM

Which 604? If you mean what GPA sells, you'll have to ask them. For all I know, the XO they sell has enough adjustability to cover every size ever recommended.

GM

**gortnipper** · July 10th, 2012, 09:28 PM

Sorry, meant the 604E since that was what the OP is looking for help on.

GM · July 10th, 2012, 10:37 PM

The E has a simple, generic XO with adjustable HF, so I assume it was voiced in a 620.

GM

**valhallax** · July 12th, 2012, 12:59 AM

shouldnt we be using a minimum of 30 inch baffles?

GM · July 12th, 2012, 01:59 AM

Well, it's my preference since it lowers the baffle step to around 100 Hz, so even a 24" deep cab is acceptable if up close to a wall.

GM

**Altec Best** · July 12th, 2012, 02:45 PM

Originally Posted by stlblue

I typed out a long reply & then a storm wiped out the Internet and everything I typed. Anyway, thanks for the replies.

Stlblue - The board is supposed to have an auto-save feature,just for stuff like this.You just have to bring it back up and it should have saved your post.. I'll look into why your post wasn't saved.Sorry about that.

I have had that happen to me many times and is very frustrating.

**stlblue** · July 12th, 2012, 03:39 PM

Originally Posted by Altec Best

Stlblue - The board is supposed to have an auto-save feature,just for stuff like this.You just have to bring it back up and it should have saved your post.. I'll look into why your post wasn't saved.Sorry about that.

I have had that happen to me many times and is very frustrating.

No worries. I saw that it was auto-saving, but when I hit the button to post, my Internet was out, due to the storm. Not sure what happened after that. Thanks