2deafears Posted January 19, 2018 Share Posted January 19, 2018 (edited) I am running a pair of KPT-904M with Marantz AV8802 pre-amp and MM8077U amp. The speakers sounded really thin, almost like an in-wall speaker. I am either doing something wrong or the amp is way under power. Love to hear the members feedback. Edited January 19, 2018 by 2deafears 1 Quote Link to comment Share on other sites More sharing options...
teaman Posted January 19, 2018 Share Posted January 19, 2018 That is never what you want to hear after dropping good coin on a pair of speakers. I am not sure how deep those bass bins dig but I think a sub is huge with the pro gear. Hope you figure it out. Quote Link to comment Share on other sites More sharing options...
HPower Posted January 20, 2018 Share Posted January 20, 2018 I bet Emile will chime in here. I have not heard the 904, but I cannot imagine this speaker sounding thin... or, underpowered with anything more than a handful of watts in a home environment. 1 Quote Link to comment Share on other sites More sharing options...
rockhound Posted January 20, 2018 Share Posted January 20, 2018 Something is up. How long have you owned the speakers? Have you checked your processor settings? Quote Link to comment Share on other sites More sharing options...
jjptkd Posted January 20, 2018 Share Posted January 20, 2018 Pulled from Klipsch spec's: RECOMMENDED MINIMUM AMPLIFIER POWER TRANSDUCER AMPLIFIER POWER RATING MONO-AMP 800W into 4 ohms LF (BI-AMP) 800W into 4 ohms HF (BI-AMP) 100W into 8 ohms 1 Quote Link to comment Share on other sites More sharing options...
Turbox Posted January 20, 2018 Share Posted January 20, 2018 I certainly don't have this issue with my 904's something is definitely up. 1 Quote Link to comment Share on other sites More sharing options...
2deafears Posted January 20, 2018 Author Share Posted January 20, 2018 My first reaction was I wanted to drop to my knee and cry. My karaoke speakers, Yamaha DXR12, have a lot more kick and sound thicker. This cannot be. I am not sure where to start other than a bigger amp. Perhaps the Crown XLS2002? I hate to drop more shiny pennies without knowing if it will actually solve the problem. To the KPT-904M owners, what are you using for amp(s)? Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted January 20, 2018 Share Posted January 20, 2018 If, as you say, it sounds thin then something is wrong. Before everyone piles on with the usual "you need a tube amp" or "you need fancy capacitors" or " speaker wire" etc, please double check everything regarding hook up, polarity etc. If it still sounds bad try repositioning the speakers. After that borrow a friend's amplifier (does not need to be fancy) and try that. Good luck, -Tom 1 Quote Link to comment Share on other sites More sharing options...
pbphoto Posted January 20, 2018 Share Posted January 20, 2018 Double check all the settings on your 8802 pre-amp. DSP/Audessey etc. Are they set to large or small? Or As a test, feed your 2-channel source directly into the amp bypassing the 8802 completely. Quote Link to comment Share on other sites More sharing options...
Speakmeister Posted January 20, 2018 Share Posted January 20, 2018 Unless you've handled this in some other way, the problem is the HF is too hot by 6dB or so. You need to get and L-Pad on the feed to the driver and adjust to taste. Remember these were made for behind screen use and need some work to get right in the home. 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted January 26, 2018 Share Posted January 26, 2018 On 1/19/2018 at 7:34 PM, HPower said: I bet Emile will chime in her OK ... bit late Got my 904's a couple of weeks ago. Have them in my "TV room," replacing a set of Cornwall's. Hooked up separately from my AV system ... powered by a Marantz 2252B (with a decent NAD CD player). Just AWESOME! Yes, "only 52W/ch) but at 1/4 volume they are giving 90dB's. Sound is louder than the Cornwall's (yes; they are more efficient) but "range" is just unbelievable ... bass is incredibly tight (2x 15" woofers) and mid/hi range is incredible ( 3" horn with 2" throat ). Have many Klipsch speakers (and tested a bunch more), but these "pro-series" cannot be beat (and yes ... there are bigger/better ones than the 904's). If you are not getting "awesound sound" then something else is wrong On 1/19/2018 at 8:28 PM, jjptkd said: RECOMMENDED MINIMUM AMPLIFIER POWER TRANSDUCER AMPLIFIER POWER RATING MONO-AMP 800W into 4 ohms LF (BI-AMP) 800W into 4 ohms HF (BI-AMP) 100W into 8 ohms Yes; probably for a full 200 seat theater. IMHO a 10W/ch tube amp will be more than sufficient in a "home setting." Next week I'll try my VTA ST70 tube amp with them On 1/20/2018 at 12:24 PM, Speakmeister said: the problem is the HF is too hot by 6dB Per specs, yes. But really did not bother me ... but I "love" horns I put the horns in a box with a grille and that probably reduced it by 3dB's ... working on grilles for the woofer boxes and don't think there will be a dB drop on those Cheers, Emile Quote Link to comment Share on other sites More sharing options...
HPower Posted January 27, 2018 Share Posted January 27, 2018 Emile, While running my Cornscalas with my 3-4wpc (2A3 SET), they sound great, not thin by any means! Your 2252B should kill, so there must be something going on with the OP'ers set up. Or, perhaps, his handle "2deafears" is ap re pro? 1 Quote Link to comment Share on other sites More sharing options...
Paducah Home Theater Posted January 27, 2018 Share Posted January 27, 2018 On 1/20/2018 at 11:24 AM, Speakmeister said: Unless you've handled this in some other way, the problem is the HF is too hot by 6dB or so. You need to get and L-Pad on the feed to the driver and adjust to taste. Remember these were made for behind screen use and need some work to get right in the home. Something else is up, Steven / scrappydue has these in his house and they are plenty fine even with a Denon AVR. This shouldn't be necessary. Quote Link to comment Share on other sites More sharing options...
2deafears Posted January 29, 2018 Author Share Posted January 29, 2018 I had a chance to connect some old amps to the speakers last night; JBL6290 to L&R and JBL6260 in bridge mode to C. They made a significant improvement compared to Marantz 8077. Based on everything I have heard here Marantz 8077 should do just fine. With Marantz 8077 I can turn up the volume and the sound gets louder, but very flat and thin. With the JBL amps the volume is down and the sound is much thicker. Quote Link to comment Share on other sites More sharing options...
Schu Posted January 30, 2018 Share Posted January 30, 2018 It's a set up issue... not an equipment issue. Get in there and find out what you are doing wrong. A plethora of things in the processor could cause thinness as sell as low output... Quote Link to comment Share on other sites More sharing options...
2deafears Posted February 1, 2018 Author Share Posted February 1, 2018 With Marantz AV8802A, the front are set to Large. I switched to Small but it didn't make much difference. Rather than mess around with the setup, I will leave everything in place and just switch the AV8802A out for Sunfire Pre/Pro to see if it makes any difference. Quote Link to comment Share on other sites More sharing options...
2deafears Posted February 1, 2018 Author Share Posted February 1, 2018 I swapped AV8802A with Sunfire, replaced all unbalanced RCA from pre to amps with balanced RCA. Everything came to life. It’s probably something with the AV8802A setup. I appreciate if you guys can tell me your settings like input level, crossovers, large or small, and so on as reference points. Thanks. 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted July 31, 2018 Share Posted July 31, 2018 - Quote Link to comment Share on other sites More sharing options...
Robert Gervais Posted December 14, 2018 Share Posted December 14, 2018 So I read conflicting reports on how to power the 904s. I have a Denon 7200 AVR that I'll be running a 7.2.4 system with 3 904s for the L/C/R. I have red concerns about powering the 904s with a small amp but also read no issue because of their efficiency.... Thoughts? Don't want to burn up my AVR or 904s. 1 Quote Link to comment Share on other sites More sharing options...
MEH Synergy Posted December 14, 2018 Share Posted December 14, 2018 21 minutes ago, Robert Gervais said: So I read conflicting reports on how to power the 904s. I have a Denon 7200 AVR that I'll be running a 7.2.4 system with 3 904s for the L/C/R. I have red concerns about powering the 904s with a small amp but also read no issue because of their efficiency.... Thoughts? Don't want to burn up my AVR or 904s. That is hard to answer without much more info. Room size, eq or not? SPL preference? Does the AVR have proper ventilation? I think with proper ventilation and one of those fancy top mounted fans on top that @Youthman recommends, you will be OK. Personally, if you are going to keep your AVR, I would get a pro amp for the front two speakers if you are looking to stay at a reasonable budget (for 2 channel music) . Ideal scenario would be separate amp for all channels and at least using the AVR as the preamp. If you are happy with the sound, I say stop there, ventilate better and put a fan on top. I don't think you will "burn up" anything that way as long as you are monitoring your gear and not trying to push things to the limit regularly. Quote Link to comment Share on other sites More sharing options...
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