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Showing content with the highest reputation on 07/27/2018 in all areas

  1. 3 points
    I got myself a Powersoft K20 for these and tested them at full power for 20 hours,the amount of power and the stability that amp has is way way higher than what the clone or the Crown could ever dream off. I set the limiters and processing and I installed them in a small club for further long term tests. The deep end is imense. I have a pair of xoc1 TH18, we got 2 Vs 2 with their own processing and limiters on a K10 and the 2 large SKHorn got +10 dB on a 2 minutes average pink noise dBz and +18 dB at 30 Hz .
  2. 1 point
    This doesn't solve the phase match problem. If one uses a textbook electrical LR4, then the phase shift of the high pass and low pass filter will be identical vs. frequency. However, unless the speaker and sub(s) are ruler flat throughout the crossover region and co-located, they likely won't be phase-matched to begin with. The THX crossover was developed assuming the mains were sealed and had a natural Qtc=0.707 (Butterworth) 2nd roll-off. Two cascaded 2nd-order Butterworths makes an LR4, so the THX crossover applied a single 2nd order Butterworth to the mains and a full LR4 LPF to the subs. Provided that the subs didn't roll-off anywhere within the crossover region, that the mains behaved precisely as specified, and that they were co-located such that room effects applied to each equally, the result was ideal. In reality of course, "bass management" is a stinking mess. The whole point of it was that one could put the subs somewhere better for sub bass, but often the "better" locations are not so good for integrating with mains, especially where multi-listener is a priority. And of course, very few mains are sealed with perfect Qtc 0.707 and Fb 80 Hz. Any significant deviations from there substantially influence the phase response in the critical crossover region. Most mains these days are ported and tuned well below 80 Hz, so they have only slight phase shift at that point. They would do better with a full LR4 HPF, but few AVRs / processors seem to offer more than one XO type. My Denon AVR has the THX 2nd order 0.707 HPF baked in, which totally destroys the bass-managed mid-bass response with any speakers I've owned. The LFE response may measure picture perfect, but the mid-bass response of the other channels looks like trash. Also, how many subs are actually flat through the XO? Most of the beefier drivers are already dropping off from inductance effects. Sad to say, home theater "technology" is still stuck in the 90s in many respects. Great sound pretty much requires extensive customization, as I've learned over the years, and the affordable options for doing so leave a lot to be desired.
  3. 1 point
    Sounds like a really good time will be had...I need to find a job at Oak Ridge National Laboratory so I can be closer to the fun. Knoxville area seems nice.
  4. 1 point
    Beastaudio's signal chain starts with an OPPO 103 running into a Marantz AV7702 receiver, sub out into a minidsp 2ch XLR and then into 2 amps for his 8 front HT18's and 2 near field HST18s. I ran a loop of his Marantz's sub out jack and added the minidsp bypassed to the mix to see what rolloff the small signal chain stuff had. I'm very impressed with the low end response of the Marantz, it is very close to the OPPO 105's analog sub out. I'll have to post a comparison of the 2 in the appropriate thread sometime soon. RED trace is the Marantz sub out and the GREEN is the minidsp added to it. I've been very curious of the AV7702's ability to handle high levels of re-directed bass without clipping the signal for a while now. I was also curious to see if the OPPO (which has been proven to clip movie tracks with hot re-directed bass) http://data-bass.ipbhost.com/index.php?/topic/379-maxmercys-wcs-test-disc-beta-and-an-o-scope/?p=6640 would end up passing the clipped signal out of the HDMI port digitally since the problem is apparently in the OPPO's digital section. I was relieved to find out that it didn't and if you attenuate the Marantz AVR's sub out or MVL by at least 10.5dB you will be for sure safe against clipping in a worst case scenario for a 7.1 track with re-directed bass. I just came up with a new design for an adjustable, all analog bang for buck sub preamp that can output over 16V peaks clean. It can be used as an LT, line booster/attenuator, RCA to XLR active converter or signal chain rolloff booster. I brought a prototype to the GTG and Bosso and I dialed in a quick curve on it to replace Beast's minidsp in the signal chain mainly due to the fact that it is flat in frequency response to below 1Hz, has a higher dynamic range and it is more flexible in the LT curve it can apply to a sealed setup. The WHITE trace is the mini DSP and the RED trace is the new SEQSS-V (dash V for variable) at the MLP. After re-calibrating the gain stages we then played some gun shot scenes from John Wick http://data-bass.ipbhost.com/index.php?/topic/372-john-wick-discussion-poll-closed/ for reference to test the system adjustment. Even though Beast's system is located in a basement, it has gobs of tactile ULF punch and this was the perfect scene to experience the ass whoopin' that it can dish out. Then we played EOT's intro square wave sustained brutality and you gotta love Brandon... he has no problem pushing the limits of whatever system is at his finger tips. He pushed his system until reaching the amps' breaking point and fortunately his Crest and Peavey have reliable protection circuits. You could hear an unpleasant transient sound when they kicked in at the end of the 15Hz tone as they severly limited the output of the following tone. Not sure if this was really reference level, my guess is that it was quite a bit hotter but I wasn't running the SPL meter at the time. I wish I had more time to measure to see at what point the amp's power tapered off but there were just too many cool people to socialize with so you guys will have to forgive me. Then we hooked up 2 of dgage's Mariana HS24 subs. Here are a couple quick measurements: BLUE trace is a close mic and the RED trace is the MLP. Room was obviously fighting us on this but we didn't have the space or time to tame the peak at 15Hz. Gage then picked Lone Survivor's helicopter scene as a reference scene to demo: I had no idea how brutal this scene was as I totally missed this movie. It had the 24's moving for sure and sounded powerful. I had many more things that I wanted to measure and post about but this was a pretty special GTG IMO (TWO mods from DB?!) and I just couldn't pass up on conversing with as many people as possible. You guys are all as cool as ice and I was happy to spend time with all of you. And Brandon: thanks buddie, you are hands down the host with the most, your theater is top freaking notch, bad to the bone. I really enjoyed the giant image of the Atmos demo and your low end is world class!
  5. 1 point
    The DSP On the pro-lites is a waste of time. Very crude and I would highly advise saving your money there and going for an outboard solution. The prolite series without the DSP is great though...assuming you don't want to operate at 2 ohm stereo.
  6. 1 point
    The 6000 is -3 dB at 5hz so I am not sure what the problem is. If you need more power then you need to spend some money. My Sanway was -3 dB at 3hz and differences are not noticed. Now if you need more power than 1200 watts at 5hz then again, you need to spend more than twice the money for 3 dB more or 2400 watts at 5hz. Did I say I love my IB which lets me use any amp!
  7. 1 point
    Of course. The last three 1 ohm models should be delivered tomorrow or Wed. I got the 2ohm for testing a few months ago and made up my mind on the spot. So (8) 1ohm and (1) 2ohm actually. Spent the last couple weeks enlarging all eight of the cutouts and recesses on my cabs and rewiring, mounting, etc. Just waiting on those last couple to show up now. I'll add some more comments on the GTG later but Nick's new DS4 driver was on hand so those of us who were curious could kick the tires a bit. That is a beefy driver and it looks like it has its shit together. Might turn out to be an even better deal than the HT18 and that would be saying something. In person it looks like something that most other vendors would be charging twice the money for.
  8. 1 point
    I sell the SpeakerPower amps and find them to be some of the best amps available for subs but they aren't inexpensive. I will say I'm not familiar with Bosso's amps so I'm not comparing them. But when someone asks me for a less expensive sub amp, I usually recommend the Peavey IPR2-7500 or the slightly beefier twin amp in the Crest Prolite 7.5. Of course both of these are more expensive than the iNuke amps but they are definitely better for subs.
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