Amp box dimensions for A370PEQ and HX300 amps

mlundy57 · « **on:** 12 Jan 2015, 01:22 am »

What dimensions do the boxes need to be for the A370PEQ and HX300 amps?

Mike

Captainhemo · « **Reply #1 on:** 12 Jan 2015, 02:02 am »

For the A370 I believe the inner cutout was 11.125" x 9.125" , I made mine out f 3/4" MDF so 12.625 x 11.625
The compact amps use a 167mm x 233mm cutout so add 38mm to both L/W for overall size using 3/4" material ( hope thats right

)

Will post the link in a minute

-jay
A370 cutout specs near bottom of page
http://rythmikaudio.com/amplifiers_info.html

Compact amps cutout specs (again near bottom of page)
http://rythmikaudio.com/compact_amplifiers_info.html

mlundy57 · « **Reply #2 on:** 12 Jan 2015, 02:08 am »

Quote from: Captainhemo on 12 Jan 2015, 02:02 am

For the A370 I believe the inner cutout was 11.125" x 9.125" , I made mine out f 3/4" MDF so 12.625 x 11.625

-jay

Will post the link in a minute

Thanks Jay. What about depth?

Mike

Captainhemo · « **Reply #3 on:** 12 Jan 2015, 02:12 am »

I did mine 4" and that was deep enough ( I also used little rubber feet underneath). I think I saw someone else post they did theirs 5", I just happened to have a bunch of 4" pieces lying around so that's what I used.

The specs show 4" as the drpth but that must be overall depth , not just from the flange (mounting surface) as like I said, mine has lots of room at 4"

-jay

mlundy57 · « **Reply #4 on:** 12 Jan 2015, 02:34 am »

Jay,

Thanks

Mike

glynnw · « **Reply #5 on:** 12 Jan 2015, 02:37 am »

Wow - you guys are reading my mind and answering questions just before I ask. Please continue. When I started building this sub a month ago I was thinking "gee whiz, kiddies, this'll be fun". Earlier today it was more of "will someone please take my worthless life". But finally got it ready for next step - norez cutting. Amp should arrive in a few days and now, thanks to you, I can have it's base ready. Thanks for the input.

Captainhemo · « **Reply #6 on:** 12 Jan 2015, 02:52 am »

Quote from: mlundy57 on 12 Jan 2015, 02:34 am

Jay,

Thanks

Mike

Are you still trying to make a descision (8's or 12"s) or have you decided and beginning a build ?

glynnw,
Not sure how far along you are at this point but if you haven't alreay done so, wire everything up, test, then do your soldering before installing the no rez, it is MUCH easier getting the iron in there with a bare cabinet (you can install the no rez in the front half of each driver "box", just leave the rear bare). Remember to revers the polarity of bo th the parallel wired driver coil and series wired servo coil of the lower ( rearward facing) driver.

-jay

-jay

glynnw · « **Reply #7 on:** 12 Jan 2015, 03:35 am »

Oh boy - I understand about reversing on the driver coils, but I am not sure of how to wire the servo. I now have it as just a series hookup. Is there a diagram anywhere?

Captainhemo · « **Reply #8 on:** 12 Jan 2015, 03:45 am »

I think I have the PDF here somwhere , if yo PM me your email I can send it to you.

Otherwise, just run the pos servo lead off the amp to the neg terminal on the lower woofer (servo coil). Run the neg servo lead off the amp to the neg terminal on the top woofer(servo coil). Then connect the pos of each servo coil to each other . . Done

-jay

EDIT:
actually, here you go, converted the PDF to jpg for you

glynnw · « **Reply #9 on:** 17 Jan 2015, 08:42 pm »

Is the servo wiring right in this above picture? One place tells me to wire this circuit serially but picture shows wire from + to + in servo circuit. I have wired as per picture and get huge constant blasts of sound when powered up. When just speaker is wired it works as expected (but of course without servo correction) I cannot figure out how to post picture here.

HAL · « **Reply #10 on:** 17 Jan 2015, 08:54 pm »

Since the two drivers are reversed in direction, but must move in unison, the wiring to one driver is reverse.

That is how my Super-V's are wired.

glynnw · « **Reply #11 on:** 17 Jan 2015, 09:14 pm »

Switching the leads to the driver coils makes the drivers move in unison. I am cool with that. But I still don't understand the servo wiring as pictured.

HAL · « **Reply #12 on:** 17 Jan 2015, 09:18 pm »

The servo wiring if both drivers were facing front would be +-+-, with them reversed direction they are - ++- since the main + lead goes to the reversed driver.

glynnw · « **Reply #13 on:** 17 Jan 2015, 09:40 pm »

OK I have checked wiring multiple times. It is now wired as pictured. No incoming signal - When I move power switch to on the speaker erupts in a constant machine gun like stuttering LOUD output. The only discrepancy is my directions say to connect the servo NEG wire to a red/black small wire from amp. There is no small red/black wire from amp so I connected it to the small black wire - servo pos is connected to small red wire.

Captainhemo · « **Reply #14 on:** 17 Jan 2015, 11:03 pm »

You've got something "crossed " then.
It's easy to get a couple of the terminals reversed with the 4 pole connectores ..... if you orient the connectors so there is top/bottom and left right poles (looking fro rear of each connector) , the top/bottom stay the same on both the male and femaole halves but the left/right have to be reversed so that when you put them together, they all l ine up

My description above and the pic match, and they are for a forward / rearward facing pair. Make sure you have the two reversed polairty coils on the same driver

-jay

Captainhemo · « **Reply #15 on:** 17 Jan 2015, 11:10 pm »

Quote from: glynnw on 17 Jan 2015, 09:14 pm

Switching the leads to the driver coils makes the drivers move in unison. I am cool with that. But I still don't understand the servo wiring as pictured.

missed this....

Just folow this, same as my post above.

Take the pos from the amp and run it to the neg of lower driver (servo coil) . Run a jumper wire from the Pos of that same coil (lower servo coil) to the + on the the upper servo coil. Run the Neg from the amp to the Neg of the top servo coil..
It's still in series, it's just reversed the lower servo coils polarity to match the lower driver coil being reversed

Like mentioned above, if the wiring is done like this (matches the pic) then something has to be crossed. Take the connectors out of the equation temporarilly to test.

-jay

glynnw · « **Reply #16 on:** 18 Jan 2015, 12:34 am »

I am pretty sure I have it wired this way, but I am sick of looking at it. Going to take a break and watch Barrett-Jackson auction and dream. I will fool with it more later and post results. Thanks to all.

Glynn

Danny Richie · « **Reply #17 on:** 18 Jan 2015, 08:04 pm »

Glynn, You just don't have them wired properly yet. If you need to just call me and I'll try and walk you through it.

glynnw · « **Reply #18 on:** 18 Jan 2015, 09:03 pm »

Got it figured out late last nite. I was working from a drawing that included an incorrect section based on comments from an old post. All the recent guidance from Captainhemo and HAL has been right on the money and much appreciated. Will post a picture in a couple of days when I get it all cleaned up.

Captainhemo · « **Reply #19 on:** 18 Jan 2015, 10:53 pm »

Quote from: glynnw on 18 Jan 2015, 09:03 pm

Got it figured out late last nite. I was working from a drawing that included an incorrect section based on comments from an old post. All the recent guidance from Captainhemo and HAL has been right on the money and much appreciated. Will post a picture in a couple of days when I get it all cleaned up.

Cool

Glad to hear you got them up and running Glynn

-jay