Inverted sub enclosure pics inside

stratusfer69, MBZ oe:

The enclosure sounds just fine to me.  I don't need giant amounts of bass, otherwise I would have gone ported or bandpass, or had the subs facing out of the box normally with them firing backwards for more output.  I used to have only one of the 10's in a sealed truck style box with the same internal volume (.63 feet cubed per sub) and this setup is definitely louder, so I'm happy.  I'm only concerned with the clearance issue if the surround hits.  But, the Xmax is .55" one-way, and the surround sits well behind the front gasket surface, so I figure 1/2" from the gasket surface should do me fine.  I'm only running an old school RF Punch 150 bridged to them, with the Punch seeing a 4-Ohm bridged load.  So, maybe 200 watts each if I have the bass gain cranked up and the HU volume way up.  95%+ of the time the enclosure will be coasting with probably less than 50 watts to each driver for a normal listening level without excessive bass.

I can't "lift the back board up", as it is part of the box, and it is a sealed enclosure.  However, I have the subs spaced down into the box with two MDF rings, so I could remove one if needed, or rout out the face of the lower ring so the sub is slightly recessed.  I don't think the loose carpet over the back of the sub makes much difference to the output, at least not much that I can hear.

If it comes down to it, I'll take the subs sitting lower in the box for a more stealthy install for a few percent loss in bass output.

Thanks for voicing your concerns though, I'm sure I haven't covered everything I need to do on the enclosure.

Mike

AHHHHH.....The FAMOUS PUNCH 150...APPLAUSE.......   What a great peice of nostalgic history! I have one sitting right here because "Nobody will take my precious" HEhEhA......I have so many old feelings/memories for it that I want to chrome plate it, and hang it on the wall.

Ah yes.... I love that amp still :-)  I bought it used back in college in 1991 or 1992 only a few months old.  It was my first really good amp.  My very first amp was a Pyramid 800 from JC Whitney, LOL.  Then I got a used Kenwood 70 or 90 watts per channel amp which outperformed the Pyramid significantly.  It was about that time that I started hanging out at the car audio shops in town driving the guys crazy with all kinds of questions, lol.  One guy let me listen to his system in his truck, it two 15's and an 18 behind the seats(if I remember right) subs were RF or Kicker, can't remember.  Anyway, it was unbelieveably loud and it was running with two Punch 150's.  The guy was going to get a Power 1000 I think and asked if I wanted to buy one of the Punchs, with box and documentation.  I said hell yeah and bought it from him and lived off .39 cent bean burritos from Taco Mayo fand Ramen noodles for a couple months, LOL.

I had a 6 ft^3 4th order bandpass box running two Kicker Competition 12's with the ports firing backwards in the hatch of my 280ZX.  The difference when I ran it off the Punch was amazing.  Easily sounded twice as loud as the Kenwood amp.  Poor 280 met an early demise, but the Punch has stayed with me and been in every vehicle I've owned since.  I had to resolder some RCA leads to the board, and have blown the internal fuses, but other than that it has been bullet proof, no matter what I've thrown at it, or how hot it has run.  I wish I had the birth sheet still, because I'd love to know how much power it really puts out, and I don;t remember what it said :-(  I think it was pretty good since the guy at the audio shop probably went through all the boxes and picked the amps with the highest ratings for himself.

I had a friend at the same time with a Punch 45 running his whole system in his truck.  He had a 15" behind the seat and that little 45 would seriously thump, even with the rest of the system running on the amp also.  Another guy at an audio shop in town had a demo system in his Blazer running off a Punch 30.  Had one or two 12's in the back, and was running all the mids off it also.  I couldn't believe that a single amp rated at "30 watts per channel" could put out that much power and still sound good.

Ahh the good old days :-)

Are there any amps for sale today that compare to those old Punch amps?  I haven't kept up with the audio scene too much, but it seems people don't think as much of teh newer Fosgate stuff as those old amps......

Mike