Line level high pass filter for PL400

[JustMike]

Very Cool Andrew. I didn't realize either you were out to sea . Hope you get home soon and put that
killer system together. Take care buddy

 

[laatsch55]

The beauty of satellites and nothing to get in the way of the signal

Yeah, no shit...

 

[Skynyrd77]

Yeah, I'm Engineer on a bulk carrier. We sail the east coast of Canada, mostly around Newfoundland and the Gulf of St. Lawrence. We're headed inland towards Montreal right now. Gotta pay for stereo shit somehow!

Sounds pretty damn cool imo!!

 

[AngrySailor]

Haha thanks guys. Yeah we might be clattering around on WWII diesel technology, but we do have satellite! It's slow as heck, but better than nothing that's for sure! There's not much to do but work and let the wheels in my head think up crazy ideas to tinker with when I get home... I was going to go to "Club Supersexe" when we arrive in Montreal this afternoon but just found out we have 14 tankers of bunker fuel waiting for us which means I have to work

 

[AngrySailor]

The beauty of satellites and nothing to get in the way of the signal

That satellite is mounted on a gyro to compensate for the ship rolling and course changes. It's all fun and games until it eff's up and you're on top of the wheelhouse 150' above the water, in a blizzard so they guys can watch the game!

 

[laatsch55]

Ah....guys are guys regardless of where they are...

 

[gadget73]

I could never do that. I'd tell them to shit in their hat and read a book if they didn't want to go out in the blizzard themselves.

 

[Gepetto]

Haha thanks guys. Yeah we might be clattering around on WWII diesel technology, but we do have satellite! It's slow as heck, but better than nothing that's for sure! There's not much to do but work and let the wheels in my head think up crazy ideas to tinker with when I get home... I was going to go to "Club Supersexe" when we arrive in Montreal this afternoon but just found out we have 14 tankers of bunker fuel waiting for us which means I have to work View attachment 17926 View attachment 17927

Just make sure you stay off of the Edmund Fitzgerald...

 

[AngrySailor]

Just make sure you stay off of the Edmund Fitzgerald...

Its actually kind of creepy. I've sailed on ships almost identical to The Fitz, on the same run. We sail over top of her if you head to Thunder Bay from the St. Mary's river.

 

[AngrySailor]

So I've been thinking about my low frequency response. I'm not running a rave or anything but there really is so much to be heard in most music at the extreme low end. My current speakers are limited to about 30hz. Maybe I should move this question to the speaker section but I'll run it by you here first. I have two big band pass cabinets will each be running on their own amp on a mono signal. I have Eminence Definimax 4015LF's in them right now, I was thinking about looking into weather one of these: http://www.daytonaudio.com/index.php/um18-22-18-ultimax-dvc-subwoofer-2-ohms-per-co.html in one of the cabinets with a Definimax in the other might fill out the bottom? This depends on running the numbers and seeing if it is an appropriate match to my cabinet (porting is not an issue as I can change that). The one problem right off is the 4 ohm bullchit :/Thoughts?

 

[AngrySailor]

OK! 0.039uF PP caps ordered for high pass filter, 18" long throw sub ordered, Tuning calculated to give flat response down to at least 20Hz and probably a good bit lower, Amp capable of pushing 1800 watts into 4ohm mono bridge which I can achieve by placing the dual VC's in series. One band pass will run 0-70Hz but only pass up to 40Hz well, the next band pass will run 30Hz-85(ish)Hz, then the PL400 takes over with the PP caps inline at 83Hz-800Hz, then on to the Rotel for the mids and horns. I think this is gonna work till I get WOPL'd! Total system power is now 4.05 horsepower

 

[laatsch55]

3 kilowatts sounds better....

 

[AngrySailor]

3 kilowatts sounds better....

Hehehe that's the car guy in me coming out!

 

[laatsch55]

That's the electrician in me coming out.

 

[AngrySailor]

Gepetto, what value would I use for a 40hz high pass for the same amp (400 series I), and where can I find the formulas used for these calculations?

Thanks

Andrew

 

[Gepetto]

Gepetto, what value would I use for a 40hz high pass for the same amp (400 series I), and where can I find the formulas used for these calculations?

Thanks

Andrew

Divide 3.24806 x 10 to the minus 6 by the frequency you are interested in.

for 40 Hz that would be 0.0812 uF, the nearest value will be 0.082uF

 

[AngrySailor]

Divide 3.24806 x 10 to the minus 6 by the frequency you are interested in.

for 40 Hz that would be 0.0812 uF, the nearest value will be 0.082uF

Thanks. If I was to apply this to another amp with a different input impedance, how would I calculate that? I assume the constant was calculated based on the impedance? I need to find a good book to read up on this stuff!

 

[laatsch55]

Thanks. If I was to apply this to another amp with a different input impedance, how would I calculate that? I assume the constant was calculated based on the impedance? I need to find a good book to read up on this stuff!

Joe, you never did answer this. Does input impedance have an effect on this??

 

[Gepetto]

Joe, you never did answer this. Does input impedance have an effect on this??

Yes it does, what is the input impedance of the other amp?

 

[laatsch55]

I don't know Joe, we'll have to wait till he gets back on shore...