I am needing to replace my piezo drivers for the S715 cabinets and they are 8 ohm 15 watt drivers. Will these cabinets only safely handle 15 watts, or can I replace them with higher wattage drivers? I am having difficulty finding 15 watt piezo drivers. Thanks for your help

If you've tried different heads with the same result, the most likely problem is a blown speaker. Check it with an ohm meter, and if it's blown, you can either replace it or get it re-coned.

According to the manual, it needs a 16 ohm minimum load, so no, you best not use an 8 ohm speaker.

Those specs would be right - I have this same board but the amp was fried by a previous owner. I pulled the amp board out and tossed it and use the mixer now to drive an external amp. Great board. This amp is rated at 1200W "peak", bridged into an 8ohm load. That would equate to about 900W RMS bridged into 8ohm or 450 per side into 4ohm loads per side. You can't daisy chain all 4 speakers....impedance would be too low. You can run two of your 8ohm speakers per side - that results in a 4ohm load per side for the amp. That would give you amp delivery of 450W per side. Your speakers are rated to handle more than that so you're fine. For the record.....you could run one speaker per side no problem....just lower power output.

If you can find an audio source that you can sweep upward in frequency slowly you will prbably find something is resonating... I even had one that the logo they had attached to the grill was vibrating.

You best rewire the cabinet to put the two speakers in series. Wire one speaker plus to minus of the other and bring the other lead, one from each speaker to your jack on the cabinet. The amp output impedance is what is set on the switch... for two 8 ohm speakers you would use both jacks to the two speakers BUT ssince you have 4 ohm speakers the ONLY option is for two in series and set the switch to 8 ohms. The amp is ONLY 30 Watts so don't expect too much sound output... You should get a nice CLEAN sound at a reasonable level. If you drive the amp too hard it will clip and you will get garbage.

you do not need to dismantel . first remove the front grill which is held in place by screws which you are able to see. you need to get a special screwdriver for this, looks like a star screwdriver but i think it has about 6 slots. then only will you will be able to remove the speakers. if you are only removing the diaphragm , all you got to do is remove both handles and unscrew the the driver . then remove the diaphragm from the driver and replace with the new one

150 watts should be easily handled by four Peavey speakers in the connection you described.. If the Peavey's are 8 ohms, then your total load was 8 ohms for the series/parallel arrangement which is well within the 2 ohm drive capability of the Crate according to specs.

I question if you really mean the speakers were in series? This requires a special cable to do this. Now if you mean they were "daisy chained" like the amp went to one speaker and another cable connected that speaker to another, then you REALLY had ALL speakers in parallel electrically which would be at the 2 ohm low limit of the amp... In either case, with only 1/4 of the 150 Watts to each, the speakers should NOT have been damaged. The amp MAY have been damaged. Try each speaker individually at a REASONABLE level to test.

If you plug into the effects loop out jack,OFTEN the connection to the internal power amp is broken so you might have to arrange a special cable as a wye to go back into the power amp as well as your external amp. In any case pwere ALL interconnected amps, etc from the same power source/receptacle for system safety.

Use a SPEAKER RATED cable which will have good quality 1/4 inch jacks. Go from a speaker out on the head to one of the jacks provided on the speaker cabinet. NOTE: some newer speaker cabinets use SPEAKON connectors and if those are provided, they are more secure than 1/4 inch plugs/jacks.

PLEASE loop the speaker cables through a handle of the cabinet at each end to avoid them being yanked out while hot as the amplifier can be damaged if it happens.

OBSERVE the maximum load. If the amp says 4 ohms minimum, put no more than two 8 ohm cabinets on the amp as two 8 ohms parallel to 4 ohms.

DO NOT use an instrument cable.

Almost all of these small 15 Watt units run 8 ohm speakers...

Do NOT expect to get much improvement from changing speakers.

Judging from the "10D", that most likely means 10 watts. 6.5 inch speaker, probably 8 ohms. Most amps of this nature have 8-Ohm speakers.

Their 12-watt and 15 watt amp have a 6.5". Their 20 watt amp has an 8". The 80 watt has a 12".

Hope this helps.