Bill Fitzmaurice

This is why you take it to a local repairman.

It can be done, but these make more sense: https://www.amazon.com/AP2BS-amPlug-Bass-Guitar-Headphone/dp/B00NAUKJTY

http://www.fullcompass.com/brand/AMP_Ampeg/Replacement-Service-Parts.html

[quote name='Greg.Bassman' timestamp='1487447995' post='3239927'] [size=4][font=arial,helvetica,sans-serif][color=#000000]what happens if they are both the same power?[/color][/font][/size][/quote]The end of civilization as we know it. The actual preferred range for amp to cab power is anywhere between 1:2 and 2:1.

Speaker short circuit failures are rare. When a voice coil gets toasted it usually results in an open circuit. The usual reason for a short circuit is failure of the speaker cable. I'd check the cable and the interior wiring of the speaker.

[quote name='The Shrek' timestamp='1487261647' post='3238472'] The positive here out of this mess, is the experience I have gained on "how not to build a cab" ....... [/quote]We all go through that stage. A surprising percentage of commercial sources still haven't emerged from it.

[quote name='Beer of the Bass' timestamp='1487171301' post='3237744'] I don't know if I'm being spectacularly obtuse here, but would you care to go into your thinking behind that? [/quote]IMO the difference between the two doesn't justify the added complexity of porting. If he had 60L net per driver it would be a different story.

[quote name='Beer of the Bass' timestamp='1487155110' post='3237522'] Just to play devil's advocate here, is the BP102 really such a disaster in this cab? [/quote]It's not what it could be. The reason one would use a driver with the specs of the BP102 is to dig deeper than what the average driver will do, and that would seem to be the OPs intent, but in a box that's way too small it can't deliver on that promise. At this stage I would not port it.

[quote name='Gottastopbuyinggear' timestamp='1487102554' post='3237183'] I've not found a speaker that models anywhere near that in WinISD. Is there some sort of magic involved in the drivers that Ampeg put in these cabinets? [/quote]Model the Eminence Alpha 10, or B810. The cab will also need a fair amount of damping to get the Qtc down. They're not identical to the Ampeg driver, but they're close. They have high Qes, not good for ported, but fine for sealed. And they're cheap, with small magnets. That's why they have high Qes. [quote]I thought this size of cab would be nice and compact and I based in on the size of a previous little Hartke 2x10 I previously owned. [/quote]The driver specs of the Hartke would have been different. The driver size alone doesn't dictate the required cab size.

[quote name='Jack' timestamp='1487097023' post='3237076'] Same cab, seal one hole and use 1 speaker?? I assume the 4 ohm load wouldn't be ideal for your combo though..... [/quote]Agreed. OP, the purpose of speaker modeling software is to make sure of the result before you cut any wood, or order any drivers. Chalk this up to a lesson, albeit an expensive one, learned. Start from scratch, do it the right way, and see if you can sell the drivers to recoup some of your losses.

[quote]The dimensions of the cab I built work nicely to stack the little Ashdown.[/quote]Doing that doomed the result. The BP102 needs at least twice the volume you allocated to work well. Stuffing two of them into that size box pretty much guarantees boomy response, with not much low end. You can salvage that box by leaving it sealed, which won't give a better result but at least it shouldn't be boomy. Otherwise it's back to the drawing board, I'm afraid.

If the cap was blown it would only affect the high frequencies.

The power rating of a driver means very little. If what you have sounds good leave it alone.

The number of cast tens still in the Eminence catalog today is a very short one: none. The only 16 ohm steel frame ten is the Delta 10B. What you have may be the discontinued Gamma Pro tens, impossible to say. Eminence would know.

Chris used a guitar combo amp for the highs and distortion.

Raggae isn't about deep lows, it's about humped midbass. That's what sealed cabs deliver and why the SVT has always been the benchmark raggae cab.

[quote name='3below' timestamp='1484862420' post='3219294'] Further inspection revealed widespread glue failure. [/quote]That could be the case for the OP as well. If visual inspection doesn't show a problem the best way to identify it is to test the drivers individually out of the cabinet using sine waves.

Is the cabinet lined?

The amp is far more likely the source of that noise than the speakers.

[quote name='alexclaber' timestamp='1484669867' post='3217350'] Yes but that works both ways. Once you exceed Xmax the amp cannot drive the cone with the same motive force because BL (magnetic field strength multiplied by metres of coil in the magnetic field) drops as more coil leaves the gap. [/quote]+1. By far the main issue with providing more voltage swing than the xmax can make use of is heat build up. When you factor in thermal compression as well it becomes obvious why thermal failures predominate

[quote name='alexclaber' timestamp='1484656628' post='3217193'] Bear in mind that plenty of bass cabs with low excursion (<3mm) drivers are tuned to ~60Hz and used with amps in the 300W+ range - if they were behaving as suggested by these graphs people would be replacing all the drivers after their first loud gig. [/quote]Even if they did there's another consideration. Going beyond xmax doesn't cause damage, reaching xlim/xmech does. The Beta 10 has 3mm xmax, with 8.6mm xlim, so there's a lot of room for overshoot. The BP102 with 6.2mm xmax will go a lot louder than the Beta 10, but with 10mm xlim there's a lot less overshoot capability, so despite the higher output capabilty of the BP102 you're far more likely to see them creased than Beta 10s. A minimum 2:1 xlim to xmax ratio is prudent. If that much is not available then it's wise to not only high pass but to limit the maximum voltage applied to the driver as well. That's seldom seen with electric bass rigs, but in high end PA it's SOP.

[quote name='markstuk' timestamp='1484582603' post='3216481'] I was looking at driver spec sheets (3012ho) and noted that the impedance appears to go into tens of ohms at low frequencies. Does this not limit the amount of power your amp delivers at low frequencies ? [/quote]Speakers are voltage driven devices, not power driven devices. An amp will deliver a constant voltage into any load.

[quote name='Phil Starr' timestamp='1484409190' post='3215285'] I had some of the old Motorola piezos which sounded OK. Bill will know but I think CTS may have taken on the Motorola plant when they stopped production. They weren't widely available over here when I checked quite a few years back. The cheap Chinese made piezo's are definitely inferior both in sound and reliability. I decided in the end that a conventional horn driver and crossover were always going to sound better. [/quote]Motorola piezos were dismissed back when they were the only game in town, to some extent rightfully so, because they were never properly employed. Motorola sold their piezo business to CTS, and they were still disrespected until a few years after CTS went out of business. That changed when NOS Motorola and CTS piezos started to command premium prices, often ten times that of the Chinese versions. Then the same people who had never endorsed piezos changed their tunes, and said that the NOS Motorola and CTS were fine but the Chinese brands were junk. I still have some NOS Motorola and CTS on hand. Some Chinese brands, notably Goldwood, work better. Piezos properly employed work just as good as compression drivers. But to get piezos to work well they must be used at least in pairs, as they lack the voltage capacity to be run singly at high volume. They also must have a real crossover, one that employs a resistor to offer the crossover a resistive load. That resistor can't be 8 ohms to use an off the shelf 8 ohm crossover, as the insertion loss is far too high. There's no off the shelf solution, it must be custom configured. I have yet to see a single commercial manufacturer who properly employs piezos.

There is a right way and a cheap way to load bass cabs with tweeters. Care to venture which method is the most commonly employed?

If it's a piezo you can't use an LPad. Read this: http://www.baysidenet.tv/catalog/pdf/piezo.pdf Note that not all piezos are alike.