Apogee Calipers are absolutely fantastic speakers, assuming that you have the right room for them and the right amp or amps (yes, plural) to drive them. There are few (if any) speakers that I believe equal the sound of a properly situated pair of Apogee planars. I have owned several models of Apogee speakers, starting with the original Full Range Planar model, and I have thoroughly enjoyed them all. Although the Caliper is one model I have not owned, although I have listened to them many times with friends that had them. Downsides: 1- Large, although the Calipers were one of the 'small' models.

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Other speakers can disappear into the decor - Apogees never will do this. They will become the visual focal point of the room. 2- Hard to drive.

Again, the Calipers were not the most difficult Apogee speaker to mate to an amp 3- Room dynamics and placement 4- Replacement ribbon and panel parts can be difficult and expensive, although that situation has improved in recent years. Now it's just expensive 4- WAF - very poor female love quotient. Re-read #1 In case you haven't seen them, here are some good links. Br3098 THANKS SO MUCH for your research and results.

Such a comprehensive article on these speakers. I really appreciate it. I am anxious to find a 'mega watt' amp to really try them out. Think Cell Key Serial. Now I am using 65wpc, one per input. It needs 'something' and I'm pretty sure that 'something' is more power.

Sadly my hearing is not good enough to hear and appreciate what these speakers are capable of. After I am sure that they are working properly I'll probably have to find a new home for them. Thanks again!! Dear Br3098, it is obvious that your knowledge of ribbon speakers is far above mine. With that in mind I'd like to ask you a question. At moderate volumes and above I will get substantial 'breakup' when bass is anything but flat.

I have examined the woofer and there is nothing loose. The ribbon seems to be as taught as a person would want it to be (without any definite knowledge of that). I am using a 63 watt rms amp for the woofer and the same for the mid/upper. I cannot compare the two speakers just yet. Senuke Cracked Blackhat more. I don't want to do anything to the second one before I have had a chance to remove it from the case and check for any problems. Just a little anxious here.

The amp I am using I am assuming is the problem. I don't think it can cope with a 3 ohm load.

It a Phast 8 channel x 63 watt unit. Might you have any thoughts on this situation? Ribbon Newby.

Bababondoman, OK, I can answer you now that my swelled head had shrink back down to it's former insignificance. You are almost certainly correct; your 65Wpc amp is not adequate to power the Apogee Caliper speakers. I would advise you to stop using these speakers with this amp IMMEDIATELY as you run a real risk of damaging both the amp and the speakers, if you haven't already done so. From your last two posts I assume that you are attempting to use some form of horizontal bi-amping (seperate amps for the ribbon tweeter and the woofer panel), possibly with a multi-channel amp. Is this correct?

From personal experience, I would avoid attempting to horizontal bi-amp unless you have a serious fascination with tweaking or repairing electronics. Vertical bi-amp (separate amps or monoblocks for each speaker) yes, certainly; but you will need to provide adequate power at very low loads. I would recommend a MINIMUM of 125Wpc.

Since I did not know if the 65 wpc 8 channel amp I was using was capable of 3-4 ohms without biting the dust I chose to take that chance. I had a mono signal feeding two of the channels and the outputs for low and high of each 65watts going to the Caliber. On a ribbon speaker, without any voice coil to bottom out I was under the impression that occasional distortion, while testing, would do no harm to the ribbons as long as the 'excursion' was not obviously excessive.

Perhaps you are concerned about the crossover networks? However, I AM going to take your advice and shelf the amp and try another amp that I have somewhere. It is rated at 185 watts at 4 ohms.

THAT ought to do the trick I imagine. Since I have never listened to ribbon speakers before I don't know what to expect other than the reviews I've read. I will admit that I like a LOT of bass due to my love of pipe organ music. I do know that these speakers will not have a great deal of spl at low frequencies.

I'll try the 185 wpc amp and report back with my observations. Thanks again for taking your time and giving me advice.:). Everyone.I hooked up a stereo amplifier that I mentioned that is rated at 185 wpc rms each channel operating.