great plains 212 8a cabs

[GM]

I think GM's R for port is semi-diameter........

Yeah, out of haste I tend to just copy the 'rport' [radius value] MJK uses in his software.

GM

 

[GM]

You’re welcome!

As long as the slot’s centerline position is the same and its aspect ratio isn’t real high [narrow slit] and each end isn’t too close to the cab’s sidewalls, then just converting round to rectangular won’t audibly affect it. FWIW, I use Altec’s ~3.5 - 4.67:1.0 WxH ratio range.

GM

 

[Zen Mod]

GM , do you mind to solve one of my permanent dilema's ?

let's say that we have TL box with port tube on bottom , (box on pedestal ) and that tube is ending 15cm in box , meaning tube's mouth is 15cm measured from bottom of box

if I want to relocate port tube to front , I need to position it's center to exactly same height - 15cm measured from bottom ?

sorry - I knew that (sort of ) but fun in Pass Forum is so frequent , that I'm forgetting things I'm not doing for long

 

[GM]

Correct, though in room performance may be audibly different due to different boundary loading, reflections.

GM

 

[Zen Mod]

tnx GM

 

[IG81]

slr 5000, any update on this, did you enlarge the vent to 6" after all?

IG

 

[slr 5000]

hi all
well we enlarged the vent but in the meantime i recieved the other driver and discovered the problem

the first driver appears to have the voice coil jamed inside the magnet assembly ,hence the cone wont move and no bass
i noticed this when i first unpacked the driver but thought it was just tight suspension that would loosen up

the driver and box showed no signs of shipping damage (i always check before opening in case i need to take pics and claim insurance) so i,m 100% sure its an assembly/manufacturing issue

as it stands the driver has been sent to the repairer nominated by great plains audio(shipping at my cost $100) to see what the problem is but its been over a week since they recieved it and no word so far

due to the lack of communication from great plains audio i,m starting to get very p@#sed off!!!

so to be honest this is turning out to be a very frustrating experiance ,i,m $1500 out of pocket and only have one working driver (sounds very good though)

lets hope that great plains audio makes this right ,i feel i should be sent a new replacement driver ,not a faulty one that has been repaired it cost me too much money for that to be acceptable

i will keep you all posted

Sheafer

 

[GM]

Bummer, sorry to say, but you're hardly the first with these folks. I keep recommending them because WRT Altec, they're the only game in town, but I don't have the enthusiasm I once had.

I guess that long term, GPA needs to come up with some shims to ~immobilize the diaphragm during shipment in case folks don't pay attention to 'this side up' markings and ship it face up, which just bouncing around while strapped to a pallet could theoretically cause this type of damage.

GM

 

[slr 5000]

hi GM
yes its definately put a dampner on the project

i will keep you all posted

Sheafer

 

[IG81]

Sorry to hear this, I hope it gets straightened out for you, these drivers should be mighty enjoyable!

IG

 

[GM]

+1 ! [need a fingers crossed smiley]

GM

 

[Cal Weldon]

due to the lack of communication from great plains audio i,m starting to get very p@#sed off!!!

Can't blame you one bit.

i feel i should be sent a new replacement driver ,not a faulty one that has been repaired it cost me too much money for that to be acceptable

Totally agree.

Bummer, sorry to say, but you're hardly the first with these folks. I keep recommending them because WRT Altec, they're the only game in town, but I don't have the enthusiasm I once had.

Ya, I think they hold their chin a little too high. I am one of the disgruntled ones. Anyone who's near Vancouver can get the same parts, lousy service, awful prices and long wait times from Vancouver Audio Speaker clinic. They are a really talented bunch but would be more expensive than GPA unless you are close. They did a nice job refurbishing my 416-8C's

 

[silverhairbp]

I never really considered Great Plains all that special when compared to others. With all the DIY help around, one can create pretty much any kind of system from inexpensive parts readily available from a plethora of competitive suppliers.

 

[slr 5000]

hi all
the drivers are very nice and the one that works sounds great
i just hope it gets sorted and fast

i have paid via paypal on ebay so i can get a refund if nessesary but i hope it doesn,t come to that

anyways i might shoot them another email and head off to work

bye for now
Sheafer

 

[silverhairbp]

i have paid via paypal on ebay so i can get a refund if nessesary but i hope it doesn,t come to that

Usually just the thought that there might be a dispute is enough to motivate reluctant merchants. But sometimes they dig in their heels. Either way, good luck.

 

[jlsem]

New drivers need quite a few hours of break-in before the bass shows up. The specifications given by reputable manufacturers are for a driver that has been broken in. A cabinet designed with T/S parameters in mind won't be right for a brand new driver.

John

 

[Cal Weldon]

John, you might want to read what slr has posted.

 

[phivates]

Dear GPA:

Please be the best we can get. We don't all want to buy stuff from Europe. Thanks!

 

[geode]

Was there ever a resolution to this. What was GPA's response? I've been looking at their products for a while and plan on building some, but if their customer service is this lacking I will look somewhere else. Too much money to accept a repair. They should have shipped a new one in my opinion.

 

[Inductor]

$1500 for one working driver - By Sheafer/slr 5000@diyAudio. What was the outcome with GPA problems?! 😕