lukeamdman

As for amps with built in DSP, I'm not aware of any class AB/H big iron amps with it built in.

I ended up getting the 10x10 miniDSP.  I'm using it for all my subs and mains.  The downside is the stupid phoenix terminals, which makes doing any quick changes on the fly impossible.  I made this for my equipment rack to make all the connections a breeze:

Unlike the cheaper models, this one can handle over 16v in and out before clipping.  Really nice to not have to worry about that.  

Mine came with a 30A powercon and 10/3 with a 30A 250v twistlock plug. Sure yours wasn't 120v Luke?

Mine had the 32a PowerCon, just a wimpy 14g cable connected to it.  It was purchased through Seaton.  As far as I can tell, the sp2-12k is only available in 240v.

I've got an SP12k on hand too. I'm going to do much the same type of testing versus a k10. I'm going to use CEA2010 bursts for the short term test and very slow sine sweeps for the long term. Probably going to use dual 21Ipals for a 2 ohm load and dual XXX for a 4 ohm. Thought about wiring up 4 drivers but that starts getting to be too much to drag outside. Dual of either aught to handle a single channel of either amp.

Looking forward to it.

There was one thing disappointing with the sp2-12k...the pathetic power cable it came with (14awg)!  I bought this from amazon to replace it:

http://www.amazon.com/Tripp-Lite-Heavy-Duty-Extension-P041-008/dp/B005KKCJRW

Oh BTW, here's some testing I did between the CC4000, CC5500, Pro Lite 7.5, and the SP2-12k on my pair of Ghorns at 15hz.  15hz is near the excursion minimum so there was no risk of bottoming the drivers.  All amps were on dedicated circuits. 

Crest Pro Lite 7.5 (120v, running in stereo):

15hz: Clipping at 127db (power cycles when attempting 128db)

SpeakerPower SP2-12k (240v, running in stereo):

15hz: Clipping at 130db

(2) Crest CC4000 (120v, one bridged per Ghorn):

15hz: Clipping at 131.6db

(2) Crest CC5500 (120v, one bridged per Ghorn):

15hz: Clipping at 132.8db

Very pedestrian testing but proved to me that all these amps in question appear to perform up to specs.  

Time to revive this thread.  

For the past year or so I've used the Crest CC series of amps and really like them.  I've been powering my subs and mains with them and can't find any fault with them other than they're heavy and the fans aren't completely silent.

I also recently purchased my first SpeakerPower amp.   The rack-mount SP2-12000 has fans but they only turn on if the amp starts to heat up, and that's been really hard to do.  I had to push the amp to clipping on music for over 10 minutes to get them to turn on, and even then the RPM was really low and I could barely hear them.  For a single amp running 2ohm stereo this is a hard amp to beat.  

Awesome!  I'm looking forward to the test results and hope it performs as close the simulation as your other horns.  

How in the hell would you do that with proper HP filtering?  Man, you have bass/SPL issues (like most of us here).  You may need to go to an artillery/rocket launcher/demolition range to get a fix.... 

 

JSS

With the filters I have on them it's nearly impossible, but, you never know.  

It is likely to have a huge impedance peak. I doubt there is any sort of inductance combating measures in that motor and a ton of steel and coil. It is made to take a lot of abuse mechanically and a ton of power with no regard for suspension or motor noise or distortion.  Getting real loud 35-70Hz is the goal and the inductance peak helps with that and so does some extra distortion. Without measuring that driver it would be a crap shoot as to how it behaves and in a horn? You'd almost have to buy one and try it.

Yeah, that seems to be the story with most Fi drivers.  Inductance monsters but durable.  

The Fi Team 18 looks like it's gone through a few modifications since the last time I saw it.  Different cone, bigger surround, and a different motor with fewer slugs but they're larger in diameter.  

Similar xmax as the UXL, but possibly with more motor and increased thermal limits with the dual 4" coils.   

Call me crazy, but I stay on the lookout for a possible LMS 5400 replacement for the Ghorns in case I ever blow mine up.  HST-18 and Zv4 are a no go, and finding the UXL in stock is iffy.

I sold an amp for a buddy a few months ago on eBay, and it had been YEARS since I had sold anything there.  To my shock and surprise, the eBay fee was 10% of the selling price!!!!!!!!

I really wish I had the cash for the amps man, I'd love to have them.  Even if I sold four of my Crest CC amps I couldn't cover the cost of one of the K10s...

possibly not actually (I'm on a slightly small screen atm), can you zoom in a bit? I used a 20dB wide y axis and 2-40Hz

Unfortunately, all I saved was the pictures.  I don't have the files I could load into REW anymore,  

I wonder what the difference between your AV7005 and mine is. Is it just a measurement artefact or some difference in how we have it connected? Also, why would XLR have a different rolloff to RCA? 

 

do we need to post some details about the measurement setup to rule out any such variance perhaps?

I wasn't in pure direct mode, and I was measuring from the subwoofer outputs.  

My soundcard is a Behringer UCA-202, and I created calibration files for it so the response was perfectly flat before adding the AV7005 or the MiniDSP into the signal chain.  

Do ours really measure that differently?

MiniDSP balanced 2x4

Marantz AV7005 (Red line is XLR, green in RCA)

Here's what mine looks like with nothing playing:

How/where do I import the calibration settings for my UMIK?  

Where can I download one of your settings files so I can mimic your view?

I found a file named "Bossobass Custom Settings.zip" from May of 2013.  If that's not it please let me know.  

Where can I download one of your settings files so I can mimic your view?

Might as well give an update. Tons of things coming in. Have to put my personal tests on hold again. The next few things in the test que according to the order recieved are...

 

1.) Sealed JBL 2242HPL

2.) Sealed SI HTS-18D2

3.) SVS SB13-U (For AH)

4.) Sealed UXL-18 retest for distortion

5.) Powersound XS15se

6.) Powersound XV30se

7.) SI 24" (Just got it yesterday. This is just dumb!)

Are you going to build a ~10-15cu.ft sealed box for that massive 24?

Dang, I was guessing that driver WAS the 15"...but it's an 18"?!?  Dang man...

I also have a Q:

 

Are the Peavey IPR2s really that good? I see them praised in many other places...

 

JSS

Funny enough, this post was just made on AVS by N8DOGG:

"Since I've got both the 7500 and the 14 clone, i'll give my 2 cents. If your running 2 ohms, get the peavy, anything else, get the clone.

My 2 new fp14's work great, no issues so far. They do a better job than the peavy with my FTW's, they hit harder than the peavy does but I have 4 ohm drivers.

The subs just seem to really hammer with the clones and hooking up the peavy, it's not the same experience. I don't have any charts or numbers, just going from feel."

Nice score. 

 

I realize they're power-house amps, combined with the high sens boxes, as insane as it sounds ...  have you explored their limits? Can you describe the fans, and how they operate at idle, in normal use, when hitting it hard, etc.? What type of line side power/how are you feeding them?  Any noteworthy power related comments?   

 

On a related note, has anyone read or experienced first hand, anything worth sharing about  the ProLite, class D series from Crest? 

When first powered on, the fans stay completely off for a few minutes.  Then, even without playing anything, they'll turn on at a pretty low speed.  At this point they're still more quiet than say a stock ep4000 or inuke by far.

I've hammered on them pretty good for a few hours and the fans have barely speed up, but it's not something you'd want in the same room.

Since they have the 30a twist locks, I had to upgrade the outlets, but each amp has a dedicated 30a circuit.  

For SQ, I can't tell any difference from my fp14k's.  They hit just as hard, sound just as clean, and running some sweeps in REW show they have the exact same response curve down to 10hz.  My horns can't play much below that, so I can't test any lower.  

As a power test, I had one Othorn on one channel of a fp14k clone running in stereo.  I played a heavy bass track until the clips lights were on hard.  Using my calibrated UMM-6 and REW as the SPL meter, I took note of the max SPL.

I then put a bridged Crest in and matched the SPL.  There was no hint of the clip lights, and the fan speed didn't increase.  Yes, an unfair test, but I wanted more power and definitely got it.  

Actually didn't Chuck get 800w out of it at 4ohms per channel and roughly 900 out of it at 2 ohms? I thought it was about 1800-1900W bridged into 4 ohm.

 

I am thinking about trying a Crest CC5500. It is rated at 1800w a channel at 4 ohms and 2750w a channel at 2 ohms. It's a lighter and more efficient than the CA-18 knock offs.

I got some open box CC5500's off ebay for $799 from an authorized dealer.  Mint.

I have each of them bridged powering an Othorn.  HOLY COW!