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Favorite amplifiers for bass


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#41 maxmercy

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Posted 23 October 2013 - 08:52 PM

Wow, thanks!!!

JSS
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#42 A9X

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Posted 19 January 2014 - 08:13 AM

Quest QA4004. Australian made class G 2400W/ch/4R and about 38kg. Tough as hell and often available locally for not too bad money.

I haven't measured it but I have the full schematic and there is only one series cap with a calculated F3 of 4Hz. That's good enough for me.

I have 2 units and soon each channel will be powering a sealed FTW21 in about 300L ea.

 

The QA3004 is also a great unit and is 1400W/ch/4R with similar great build quality and about 10kg less weight.


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#43 Hifisound

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Posted 01 February 2014 - 01:35 PM

Anybody tried the Crown XLi series or Yamaha P series as sub amps ?


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#44 Archaea

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Posted 06 February 2014 - 06:49 PM

I tried a Yamaha P3500S amp on a pair of JTR Captivators. It worked fine and I was very impressed with the amp, though it was underpowered for my application. The amp wasn't rated for 2 ohm stereo use, but it worked, and the fan never kicked on in my usage of the amp. It has a thermal turn on point of 90*C. Overall I was very impressed with the Yamaha p-s series. Build quality is among the best of any amp I've messed with. Attenuators have a satisfying solid feel, very solid all around!
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#45 Infrasonic

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Posted 06 February 2014 - 07:26 PM

Ah yeah I think the 7000S is the Yamaha to aim for if using with subs/bass.



#46 Kyle

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Posted 19 February 2014 - 09:57 AM

Just picked up a pair of RMX-4050s, huge power, big upgrade over the EP4000.

Down side is they are not cheap and very heavy

Upside is they really deliver and for a lot less $ than a PL or itech

 

If you don't need to move your amp around too much, you can't go wrong with this thing. Got em for about $1100 each.



#47 lukeamdman

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Posted 06 January 2015 - 10:24 PM

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.  



#48 lukeamdman

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Posted 06 January 2015 - 10:52 PM

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.  



#49 Ricci

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Posted 07 January 2015 - 07:05 PM

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.
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#50 lukeamdman

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Posted 07 January 2015 - 09:22 PM

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.co...8/dp/B005KKCJRW

 

 

20141003_142644_zpskyv1jltv.jpg



#51 3ll3d00d

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Posted 07 January 2015 - 09:38 PM

FWIW I bought mine from seatonsound, it was both cheaper and ships with http://www.neutrik.c...-32-a/nac3fc-hc on the end of the power cable.

 

EDIT: actually now I reread my emails I see he said it normally comes with the powercon but he includes a terminated power cable, not clear from the above whether the connector is the problem or the cable. I suppose not such a big deal for us in the UK anyway.



#52 Ricci

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Posted 07 January 2015 - 10:21 PM

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



#53 lukeamdman

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Posted 07 January 2015 - 11:31 PM

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.

 

 

 

20141001_110631_zpssko5a9kl.jpg



#54 Ricci

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Posted 09 January 2015 - 07:56 PM

Figured I might update the old amp list.

 

Mackie M1400i Repaired still powering JBL compression drivers
Behringer EP4000's  (Sold) Long gone...
Crown CE4000's (Sold) Long ago
Crest 8002's (Still have 4 of these.) Still a great bass amp. PFC! 66lbs, basic black, no light show.
QSC PL9.0's (Sold)
AETechron 7560's (Sold) Sort of wish I'd have kept these now.
Powersoft K10's (Sennheiser KPA2400's) / Sold...And going to a good home

 

Behringer Inuke-6000 non dsp

(Bought this to see what $400 could get these days. it does have a good amount of power but the old Crest 8002's are rated at only 4kw yet seem to be quite a bit more powerful on big subs. Tried it on full range duties and did not like how it sounded in the upper midrange and treble. Tried it on full-range bass guitar in place of an 8002 and thought it did ok but the guy playing bass said it sounded weaker and the tone was different. It's his call so that was swapped back out quickly. Then tried it on a stereo pair of GH's and it abruptly died. It was not being pushed hard at the time. Got it replaced under warranty. Moved it to mid-bass duties covering 70-750Hz wired at 8ohms stereo running 4 very efficient 15's and it has been fine ever since. Overall I was a bit disappointed in the amp. It felt very cheap, was ugly, gaudy lights, blew up once, and didn't seem to sound very good except when used below the mid-band. Plus the fans are really loud. The best thing going for these is the DSP. Still a great bargain for the money but I'd look to other amps if the DSP isn't needed. Sorry if I offend anyone with this but that's my impressions of it. I am a bit spoiled in the amp department though.

 

Dayton PSA-1000/SA-1000

I've reviewed a number of subs using this amp. Offers a pretty good amount of power for the price. Has a nice range of adjustments on board. The built in rumble filter is easily modified or defeatable. I wish they had an XLR input. (I avoid RCA's like the plague, virtually none of my equipment uses them.). Gain is crazy high on these. Can be a bit noisy due to that if care isn't taken with gain structure and grounding. One other thing of note is that it appears that these are allowed to go all of the way into hard clipping rather than employing a clip limiter, which will generate a lot of power but lots of distortion as well. Not really a big deal in the scheme of things just something a bit different from most other comparable amps. Wish list for this one would be a speakon connector on the rack version.

 

Emotiva XPA-5

Class D, SMPS amps have come a long, long way but they still seem to sound a bit harsh in the upper mids and treble to me. The Powersoft K series is about the best sounding I have heard run full range but I still like older school amp technology for full range or upper bandwidth duties. That is why I bought this a few years back. I really like this amp and think the Emo amps are a pretty good bargain for the most part. No fans to worry about, XLR inputs, very well built weighing near 70lbs and it offers plenty of dynamic reserve for most situations. I wish they would dump the silly consumer audio connections like the IEC detachable power cord and go with powercon and add speakon outputs. I also wish there was an adjustable input sensitivity as well, but still for the $800 I paid it's been a nice amp.

 

Speakerpower SP-4000 plate

These are the real deal. Brutal amounts of power in a plate amp. More than most single or even dual drivers will be comfortable with over long periods unless some long term limiting of current is invoked. I know in one case a driver, that many people brag about as being able to handle the biggest amps around without issue, was summarily torched and the coil turned into a burnt slinky in short order on one of these. No it was not by me! Very simple layout too. Only thing I wish it had was a more user friendly DSP interface and system.

 

Speakerpower SP2-12000 see the SP-4000 comments and multiply by 2. This is a very powerful amp no doubt. One of the most powerful on the market. I like that the fans won't turn on until the amp starts to develop some heat which takes a bit. Nice and light weight too. Very efficient. The version I have has the input trims on the front panel thankfully. Having them on the back would have been a bit awkward so I am glad that move was made. Much like the plate version I wish the amp had a more user friendly dsp system. I also wish that there were a few other things such as universal voltage capability and bridge capability (for those times when you really need to let your Danley TH812's loose). Also the amp looks rather pedestrian. I'm not a huge aesthetics guy but this is a $3.5K amplifier. On the amp I have there are grounding wires to the chassis and adhesive that can be seen right through the front grille. This is because there are no air filters?! That seems a bit odd to me because the grille slits on this amp are quite open and it does have fans. I would think that without filters that all manner of dust and debris may easily be pulled into the amp in short order. Maybe they just weren't in place in this loaner amp. Minor gripes aside this thing makes huge power. There is no doubt about that. It seems to handle 2ohms nominal pretty easily so far as well. Also for anyone wondering I measured the response of this amp and it is -3dB down at right about 4Hz. Good enough for the bottom dwelling IB and sealed power users out there me thinks.

 

I also have a few new amps I'm working with or will be working with soon. I've got a Powersoft K20-DSP or 2 on the way, I should have an M-Force module soon and also an IPAL module.

 

Lately I've changed my tune about dsp being built into the amp. I used to not care. I'm starting to realize that the more cables and power cords I have to run the more complicated and messy things get. I'm a fan of condensing things into as few electronic units as possible now. With that said I wish someone was making old school torroidal power supply amplifiers with DSP front ends and large channel counts. Does anyone know of any? I would imagine there aren't because at that point you are blending consumer/ "HiFi" with professional traits. I mean you have Lab Gruppen PLM20000Q's and such or Powersoft's new X8 8 channel amp with DSP but these are $10K amps.



#55 lukeamdman

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Posted 09 January 2015 - 08:16 PM

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:

 

20140723_133953_zpslbjlubl5.jpg

 

20140723_215417_zps2axgsief.jpg

 

 

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



#56 lukeamdman

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Posted 09 January 2015 - 08:34 PM

 

Speakerpower SP-4000 plate

These are the real deal. Brutal amounts of power in a plate amp. More than most single or even dual drivers will be comfortable with over long periods unless some long term limiting of current is invoked. I know in one case a driver, that many people brag about as being able to handle the biggest amps around without issue, was summarily torched and the coil turned into a burnt slinky in short order on one of these. No it was not by me! Very simple layout too. Only thing I wish it had was a more user friendly DSP interface and system.

 

Since Mark posted this in one of my threads on AVS, I don't think he'll care if it's posted here as well.  This comment is in regards to SpeakerPower amps:

 

With a reasonably stiff power line, you won't see any sag all the way to around a 1.5 Ohm minimum impedance. Below there you will see some current limiting and reduced maximum power, but it will still work just fine. When I was testing a dual 2 Ohm HS24 with coils paralleled, I left too little time between test runs with a 12-14Hz sine wave in a smaller sealed box, and the SP4k melted the wire right off the former driving the 1-1.5 Ohm impedance. 

 

 

I know a few guys at a GTG tried to blow a HS24 by wiring each coil of the sub to each channel of a SP2-8k.  They noted the amp went into protection mode before the HS24 gave up, but I'm willing to bet that voltage drop on the AC going to the amp was the cause of that.  Mark smoked the coils with a SP amp that's essentially half of a sp2-8k in plate amp form.   



#57 BeastAudio

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Posted 09 January 2015 - 08:40 PM

Yea that was me, and bosso, paul, popalock (it was his driver), Nick from SI, etc. It was fun. We certainly had some voltage drop but it likely wasn't too terribly much, we just weren't running sine waves :D I had that amp on a dedicated 30a 120v so it was probably chugging along just fine...



#58 lukeamdman

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Posted 09 January 2015 - 09:11 PM

Yea that was me, and bosso, paul, popalock (it was his driver), Nick from SI, etc. It was fun. We certainly had some voltage drop but it likely wasn't too terribly much, we just weren't running sine waves :D I had that amp on a dedicated 30a 120v so it was probably chugging along just fine...

 

What kind of content were you playing when the amp went into protection?  



#59 BeastAudio

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Posted 09 January 2015 - 09:43 PM

I think one of Mark (imagic's) ULF tracks that has some pretty serious content down to the single digits. All I know is the woofer was going absolutely bonkers before we "Hit the lights"



#60 Ricci

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Posted 09 January 2015 - 09:55 PM

Haha...Yeah it was Mark that told me that. I didn't even know about it. I don't think the amp was near clipping either.

 

Content and crest factor is everything. You could run the amp up to clipping on the peaks of something like Metallica And Justice for All for hour and the sub will probably be fine. Other content not so much...Guys like Mark have to assume there is a dumbass out there who will turn the system up to the point the amp is clipping full time with a compressed dub or techno channel and just leave it running like that for 6 hours. If it won't survive that or similar he can assume there will be warranty claims from said dumbass.

 

Are you sure the guys were trying to kill the woofer? I don't advocate doing that type of thing but it sounds like the guys might need a lesson or two if they can't get it done with an 8kw amp! B) J/K

 

On the serious was the driver in a box when this took place and how long was it subjected to the music or whatever?  

 

BTW Beast I just received the box for that driver from Nick this week. I think it used to be yours? I've got plans to dig into the guts and see if I can cram 3 or 4 6" ports in there too. Might as well while I have the big woof. It won't be 40 cubes but the modeling does seem to indicate some good gains just in 15ft.






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