Celestion CF18VJD vs PD1850

studio45 wrote: I see. That does sound like quite convincing testing. Only one thing that I can think of, was the last-stage highpass filtering the same in all cases (both tests, both amps)? Otherwise, the Itech may have been un-highpassed and pouring in power below 25Hz where all it does is flap the cone about, whereas the Inf 8 could have had the highpass on and been directing all its power into frequencies that actually make noise in the room. I assume pre-amps were being used, so there would have been plenty of <25Hz level in the driving signal?

At Southall Amp test, Ren operated his own control tower, so unsure of actual HPF, but can positively guarantee, ALL AMPS tested under SAME CONDITIONS.

As regards to ITECH 8 performance on PD1851s in GP, can safely say, I'd much much prefer much cheaper used CA18/MA5000VZ to one of those.

luton_soundman wrote: cones were in full control and never flapping around. ren is a real engineer and builder. you will never see his speakers flapping around or overdriven. this was not an amatuer testin session conducted by a random with equipment. all who were there can verify this, even matrix matt!

+1

Obviously, for those who run HPF lower than 50hz, and add  sub boost, and use  PDs/CF18s in scoops, then the serious high end lightweights are suitable.

For other users, ITECH8 and other similar amps would be fine for many other music types.





Edited by levyte357- - 26 December 2012 at 3:23pm

I have BSS EPC780 amps, and I love them very dearly even though they are small, small potatoes power-wise compared to these amps, and I would probably spend quite a lot of time defending them on forums.

PauliePaul wrote: levyte357- wrote: "Quote from levyte357   In short, the Results "IMHO" 1. Powersoft K10 - The Ruler - Tremendous sub and SPL across the four scoops, no notes missing or premature sub roll off 2. Powersoft K8 - More of the same, just bit less aggressive 3. Crown ITECH-8000 - As good as people say and the suprise of the day.. Not the force/SPL of K10, but many preferred the musical notes, and said low extension even exceeded K10" Surely that's not a change of tune is it....? The above is quoted from the amplifier testing session thread - seems like a different story.... or amp... or something....

Was told "incorrectly" by someone during that test, the ITECH8 wasn't clipping, and amp had plenty of headroom left.

Then told by number of people, who had been watching the amp closely, amp, clipped, was about to thermal, and then gains backed down. All of this with most people not knowing.

Then in GP, without "molly cuddling", the amp was giving all it had, and clipping hard, not that much coming out the PD scoops, for all to see.

As said many times since, only amps that day, which didn't thermal or clip on 4 ohm stereo PD 1850 load, was Inf8Mk2 & K10.

Wondering why you're defending JokeTech8, almost 2 years later. Don't suppose you have one coming up for sale soon ..?





Edited by levyte357- - 27 December 2012 at 12:35am

levyte357- wrote: Any further scoop designs being used for CF18?

SBC wrote: some of us have heard 4x loaded into ASS scoops recently...