Ricci

Nice looking room LaHatte.

Updated for sale list...All equipment is used and may have a few cosmetic blemishes but is otherwise in correct functional shape. 2 XXX 18's left. $550ea shipped or $500 each local pickup. I will drive to meet. Chane SBE-118 and a Chane VBE-118. Both are passive cabs with a single 18. One sealed the other vented and tuned to the 17Hz range. Local pickup only. $185 each. I will drive to meet. BMS 18n862 18's. 1 pair. Low distortion with excellent all around performance. $450 each shipped. Local pickup fine too. Gjallarhorn pair. The originals. Loaded with LMS Ultras. $1150 each or $2300 for both. You will need to setup freight shipping, schedule pickup and pay all shipping costs. It won't be cheap. Local pickup greatly preferred. I may be willing to deliver if within reasonable driving distance and travel and gas expenses are paid.

I do listen to a lot of music in the garage while working. fairly subdued volume levels though. A couple Dayton 15's would probably get it done really.

I actually do have an attic storage space above the garage that would work for an IB. Hmmmm.

Nah not selling all that. Just reached a point where I realized Id like to get some space back.

Still 2 18" XXX's left. Somebody grab these! Right now my garage is a train wreck with multiple projects going on and crap everywhere. I was looking around in it yesterday and realized I REALLY need to liquidate more stuff. This is what is currently sitting in my garage. 6 XXX 18's 7 TD15M Apollo's 2 BMS 18n862 1 LMS 5400 1 Alpine SWR-1522 4 21Ipal 1 Aura NS18 A couple other random drivers That is just what is mine. There's also 1 SI 24 2 SI HST-18's 2 other 21's to be tested for a Mfg 1 Other 18 to be tested for a Mfg There are drivers, subs and boxes everywhere.

Werd...

Just added up the driver specs for a few new drivers I have on hand. Aura NS18 Alpine SWR-1522D SI HST-18d2 rev 2

Bass-less. Hardly!

Looks like there are only 2 XXX's left if anyone is on the fence...

Looks similar to the Armonia GUI. I assume you are measuring the rms voltage during your tests Luke. Note that the voltages shown in the GUI and LG literature will be peak numbers. 98 volts peak would equate to roughly 69.4 volts rms.

It's a long shot but it there any chance that the signal being sent into it or the inputs are clipping?

I agree with SME this has nothing to do with bus pumping. It is already a fully bridged design. Also bus pumping can damage the amplifier in short order so fast acting protection circuits would normally be used to recognize the issue and stabilize the amplifier. Typically this would involve muting the outputs completely among other things. This sounds like the amp is hitting a long term limitation in the power supply, an internal limiter, or severe clipping. Are you sure it does not have some type of current or voltage limiter engaged in the dsp or somewhere else? It may just be that it has a low rail voltage and once the caps are drained it just doesn't have much voltage to work with.

I think I know what I'm going to do next but I have a feeling it's going to take quite a while to sell these if they sell at all. I need to do that prior to moving forward. Who knows my current plan may change by that time.

It's time for a change Scott. Now seems like a good time. I barely ever use the HT and I figure it's going to take a long time to sell these.

RE Audio XXX 18d2 Drivers (8 Available) All are dual 2 ohm voice coils. All work just fine. 6 are the older split coil version. 2 of them are the newer REV 2 version with an overhung coil. $550 shipped each. To the lower 48 only. $500 each local pickup greatly preferred. Louisville, KY area. I will drive to meet some one half way. Possible price break and willingness to travel further if someone wants multiple drivers.

The average resistance will go up with more heat in the coil but whether the magnitude at any one frequency goes up or down is not as simple. Once the coil really heats ups or the driver is under a lot of pressure or excursion demands are high the impedance can shift dramatically. You can see this in the power compression tests for a number of systems.

Can't tell much if anything about power compression with this data. The tests being at 2 frequencies nearly 1/3rd octave apart can easily account for 2.5dB itself. Not to mention one has a much lower impedance than the other. Not really apples / apples at all. Luke even as strong as those drivers are Id be careful with doing this type of stuff. You may cook one. Use as many drivers as possible so they don't get heated as much.

Guys I don't care about cussing or a bit of heated arguing but keep it from getting too ugly.

I could do the weekend of November 6th or the 20th for a potential GTG. Not sure if that works with anyone else. Obviously Halloween and Turkey day weekend are out. I have a prior commitment the 14th weekend.

I wasn't joking but that's up to him really. I could make it happen if we got a schedule worked out.

I'll just drive down and bring it back with me.

Couple of things. 1.) The SP-12K I have on loan does have front panel clip, signal and protect indicators. Putting them on the back was completely nonsensical to me. Glad that change was made. 2.) I could not get the SP-12K or the K20 to protect with any content above 20Hz in any of the particular scenarios I used. Protect was much more likely below 10Hz with lower impedances. IOW higher current demands. A lower impedance load may be different as may a smaller 120v line, but it is clear that the sub bass stuff is a much greater drain on the amps either way. YMMV 3.) I've read a lot about that SI-24 / SP-8K deal and I don't know what happened there. Not enough info. Perhaps the content used really wasn't as demanding on the driver as what is thought or maybe Mark is right and there was severe line sag on the 120v line. I'm confident that the 12K I have would not be able to be let loose on the 24 in the exact box used at that GTG with the GP DB type testing or the 24 driver would need re-coned. 4.) I'm going to take the SP-12K and use it to GP test a sealed IPAL-21 which is a much rougher load than when loaded in a horn with a HPF. It will be on 240v. We'll see how that goes. I'll capture the applied voltage and already have the impedance measurement for that enclosure+driver so we will be able to do a rough calculation of the current and power.

Thanks Brian. I always try to be unbiased and fair. It is not easy sometimes I will admit. Anyway I think both amplifiers performed extremely well. Each has particular strengths and features. The fact that the 12K fans do not run most of the time is a huge plus for home theater installs. I'm thinking about building a hush box or remote locating my K20's now. Their fan noise is less than most amps I've used but compared to silence it's no contest. I can see why the SP plate amps have become so popular. It is such a big step up in power from the other choices available. The typical "1000w" plate amps are toys in comparison.

We may not know the measured current and voltage limits for either amp over certain frequency ranges but I don't know of that type of data from other amps to compare to anyway.All of those tests cut off at 20Hz if they even go that low. I can get that data from the K20. It tracks the output voltage and current, the impedance of the load, average power, temperature in the amp, rail voltage, AC line voltage, blah, blah. Likewise it also shows when limiting occurs whether current or voltage and clipping in real time. The SP-12K doesn't have all of that so you would need a test rig to gather the data and of course we don't know whether the clip lights occur well before or well after actual clipping but I'd say it is fairly accurate at indicating that the amp is out of "more" since the output would plateau. No idea what the distortion is at that point. We do know how these amps compare to each other at least in a limited sense. The K20 puts out more clean signal. It should based on the specs and that is what all of the tests showed. (As long as it is bridged for the sub 20Hz range of course.) The SP-12K might possibly put out more into very low impedance loads with sustained signals, which is also what the results showed. It seems to be allowed to pass a bit more current for longer. The K series is limited to 32A long term and claims like 125A peak short term ( I believe the indefinite limit is capped at around 4Kw). Both could probably pass more for a longer time but there has to be a limit to avoid tripping breakers which is a bad day all around at the gig. There's a limit to how much heat can be dissipated as well even with 90% or better efficiency. After bridging the K20 it did not protect during any of the tests. Perhaps bridging it into a lower impedance like 2ohms mono would cause it. I'll probably end up trying it. The SP-12K did mute with <10Hz if slammed into clipping. I don't mean approaching clipping I mean get to the point the clip lights are flashing and then give the volume knob another spin. Other than that it was fine with everything else too. Would be interesting to see the behavior at 1ohm minimums.