Bad 2235H?

[Loren42]

For the first time I had a chance to crank up the amp and drive the speakers at a loud listening volume, but not so loud as to be uncomfortable. We put on Hector Berlioz's Symphonie Fantastique, which I was stunned at the dynamic range of that CD.

Toward the end of track 5 we had the left woofer make a crack or popping sound, which I assume was the voice coil slamming into the back of the magnet structure.

This surprised me because my amp is only 60 Watts, so I would not think that it was a simple case of over driving it. The right woofer played fine and subsequent tracks on other CDs occasionally did the same thing to the left woofer. So, we backed down the volume.

These woofers had a bad time when they were shipped to me and both cones and the domes in particular got some damage when the plastic tie-wraps that held them together broke enroute. I am now thinking that it may be time to bite the bullet and have them reconed.

[neanderthal]

For the first time I had a chance to crank up the amp and drive the speakers at a loud listening volume, but not so loud as to be uncomfortable. We put on Hector Berlioz's Symphonie Fantastique, which I was stunned at the dynamic range of that CD.

Toward the end of track 5 we had the left woofer make a crack or popping sound, which I assume was the voice coil slamming into the back of the magnet structure.

This surprised me because my amp is only 60 Watts, so I would not think that it was a simple case of over driving it. The right woofer played fine and subsequent tracks on other CDs occasionally did the same thing to the left woofer. So, we backed down the volume.

These woofers had a bad time when they were shipped to me and both cones and the domes in particular got some damage when the plastic tie-wraps that held them together broke enroute. I am now thinking that it may be time to bite the bullet and have them reconed.

I just went thru the same deal on two 2235's in one 4350 cabinet, and cost me at the tune of $432.55 to get two of the four 2235's reconed.I didn't have the volume cranked so high you couldn't talk either.They say the 4350's can handle what you can throw at them but I just don't see it happening without costly damage.

[Loren42]

I just went thru the same deal on two 2235's in one 4350 cabinet, and cost me at the tune of $432.55 to get two of the four 2235's reconed.I didn't have the volume cranked so high you couldn't talk either.They say the 4350's can handle what you can throw at them but I just don't see it happening without costly damage.

That's probably a good way to put it. We were still able to talk to each other. And we did when we heard it.

I am thinking a subsonic filter would be good insurance. At 60 Watts, which is pushing it for my amp, the xmax should not be reached until you get down to 17 Hz according to Bass Box Pro. It's a guess what xmech is, but that must be lower than 17 Hz.

Must have been some serious rumble way down there.

Ah, according to Bass Box Pro Library, xmech is 11 mm or just below 15 Hz at 60 Watts.

[neanderthal]

That's probably a good way to put it. We were still able to talk to each other. And we did when we heard it.

I am thinking a subsonic filter would be good insurance. At 60 Watts, which is pushing it for my amp, the xmax should not be reached until you get down to 17 Hz according to Bass Box Pro. It's a guess what xmech is, but that must be lower than 17 Hz.

Must have been some serious rumble way down there.

Ah, according to Bass Box Pro Library, xmech is 11 mm or just below 15 Hz at 60 Watts.

Yeah I'm going to have to do something but at this point I don't know what.John Vanderslice at Slice speaker said they hit bottom hard and I wasn't no way near having it so loud you couldn't talk.Maybe the subsonic filter is the answer I'll have to look into it.

[Allanvh5150]

Not the voice coil as such, more than likely it is the mass ring hitting the front plate. You definately need a high pass filter on these and maybe some extra watts wouldn't go astray. 60 watts wont offer a lot of control at low frequencies.

Allan.

[remusr]

Dr House here - I would expect it is your relatively small 60wpc amp clipping and not the 2235 bottoming! I had a DH500 clipping into my L100T's and making a click, suspected it was the woofers but it turned out to be the amp - the 12" woof could take more than the DH500's 250wpc rms so I think it unlikely 60wpc is bottoming your 2235. I can put more than my Mac's 350watts into my L300, 4430, 4435's with no issue. "...more speakers are damaged by low power than high power...." Now if you hear it rubbing all the time the 2235 may be damaged but if it clicks at high volumes it is almost certainly your amp. A misleading thing is your volume control as the pre-amp section always has more voltage amplification than needed to overdrive the power-amp section. Most amps I've used start clipping with the control at 12 o'clock - what appears to be 1/2 volume is in fact enough pre-amp output to overdrive your power amp.