March 19, 2021 § Leave a comment
The CR-1 crossover/Dominion d110 system made a major difference in the way my room interacted with the ELAC AF-61s, and that difference was even more sonically impactful to the overall sound than the additional headroom and reduced physical stress on the loudspeakers and power amplifier. Shunting the mid- and low bass away from the mains and into the Dominion subwoofer removed a noticeable amount of excess midbass bloat and huffiness coming from interactions between the room and the AF-61s, when ELACs were responsible for generating frequencies below 60Hz. The audible effect was an increase in overall bass clarity and definition and a reduction of overhang and midbass bloat. It was a real surprise to hear the whole room become a better listening environment as a result of the addition of the CR-1/Dominion system.
March 13, 2021 § Leave a comment
The trick to getting better sound with subwoofers than you can get without them is to set up and configure them optimally for both your room and the loudspeakers they are paired with. I was very pleasantly surprised by the many ways in which the addition of the CR-1 and the stereo Dominion d110 subwoofers improved the overall sound of my system. The first and most obvious improvement was bass extension. Listening to the song “Heaven” by Meshell Ndegeocello, which combines her luscious voice with a real piano and synthetic bass, it was hard not to be wowed with the Dominion’s low-frequency performance. The bass was powerfully big—phat but also controlled, with well-defined textures and detail. Oh, and clean, too.
March 3, 2021 § Leave a comment
The fact that a literally breadbox-size subwoofer can produce actual 25 Hz-and-lower content at any musically useful level is newsworthy. And so is the KC62 as a whole: if you insist on breaking Hoffman’s Iron Law, or at least bending it to its limits, KEF’s inaugural Uni-Core design does so as dramatically, and as classily, as any sub I’ve seen. Within the “iron” caveats of a small room and/or relatively modest level demands, it will match the performance of a well-engineered 12-inch sub in every important parameter except peak dynamics and level. There may be other mini subs on the market, but none I know of go quite as low in quite as small and elegant a package as what KEF has managed with the KC62.
December 20, 2020 § Leave a comment
I have heard several flagship speaker systems with independent standalone bass columns that were pretty amazing. Actually, they were downright spectacular! This includes models from Infinity, Genesis, MBL, and YG Acoustics. However, you have to remember that a No. 25 stack goes well beyond what these bass columns can offer, and it’s not just the much larger 15 inch drivers. Each stack of No. 25 subs have multiple 15 inch drivers and 1000 watts managing each individual driver. Let’s not forget the available fine tuning for gain, equalization, and crossover functionality for each unit. This yields plenty of horse power and dialed in flexibility that is not generally available in any other standalone design!
The potential is there. This stacking strategy can also work with several other models in the REL lineup. If your room and space requirements will only allow for something smaller in scale or budget, there are many options. Obviously, it can be very subjective, but many have stated that the cost and value of such six-packs can provide better overall system improvement than an upgrade to a much more expensive primary speaker. You can also add units as the budget will allow. Again, there are multiple paths to all the glory. I will keep the readers updated on this.”
December 4, 2020 § Leave a comment
The phase dial is the lower-most one in the photo. This adjusts the phase-angle of the deep bass sound. You have to do this by ear. Play some music with deep bass and turn the dial until it “sounds” the most appealing.
At the bottom are push buttons to play a Tone Sweep (120 Hz to 20 Hz). This lets you find out if you have anything resonant in your listening room so you can fix the problem. I ran this test and found a resonance in the 100 Hz – 120 Hz range. The spectrum below shows the sweep from left to right. I used an accelerometer for this test. There is a large peak in that range. Since it is above the highest crossover (Low-Pass) frequency of 80 Hz, it is not a problem that would be caused by the subwoofer.
October 4, 2020 § Leave a comment
“One reason I chose to use the Marantz NR1200 for the review is because it has a good FM tuner that I could leave on all the time. I would listen critically at the end of the day and I could hear the speaker slowly improve day by day, week by week. Eventually, I just let the CD player go all day while at work and left the door open so I could listen. I love my job!
Matt and I listened to a few tracks to make sure everything was playing correctly. He thought they sounded promising. Fortunately, my other friend, John who is a co-founder of the River City Audio Society here in San Antonio was able to stop by after a couple of weeks. John mentioned that over the years he had owned 3 different pairs of NHT speakers. He loved the bass and midrange, but his ears are sensitive to bright or hard high frequencies. So, after a while, he would move on from each of the NHT speakers because he would be bothered by the highs. John and I listened for a couple of hours and he liked the sound but felt there was still a hint of hardness in the highs. I took note and hoped he would come back again after a few more weeks to see if things had changed for the better.”
August 9, 2020 § Leave a comment
“The correct position of the Crossover Mode switch will depend on where you are sourcing the audio signal you’re using to drive the KF92. If it’s from a component that is supplying an audio signal that has already been through a low-pass filter (such as the LFE output of an AV receiver, for example) you’d set this control to ‘External’. If you’re sourcing from an ordinary line-level or speaker-level output, you’d set it to ‘Internal’, and then set the low-pass (crossover) rotary control to the appropriate frequency.
KEF’s equalisation mode control is fascinating. I don’t think I’ve seen its like before. Yes, I’ve seen EQ mode controls that offer two or three modes, (usually ‘Off’, ‘Wall’ and ‘Corner’) but I have never seen one that offers five modes… and I had absolutely no idea what the ‘Apartment’ mode might be used for – indeed I had to consult KEF’s Owners’ Manual to find out.”
August 5, 2020 § Leave a comment
“With a single subwoofer set up along the front wall, listening to the test tones during the D.A.R.O. calibration, which go well above 80Hz, I found it easy to hear the sub’s location. When I added the second sub, on the left sidewall, the test tones seemed to come from the whole left wall. When I added the third sub in the right rear corner, the test tone filled the room, with no identifiable source. That last situation is ideal, but I judged the first acceptable: It’s OK to have bass emerging from the part of the room where the main speakers are located. I eliminated the two-sub setup from consideration and limited my listening to one f110v2 along the front wall and the three-sub array, arranged as in the third bullet point above.”
July 27, 2020 § Leave a comment
“A passive radiator is something entirely different. It is a driver with no voice coil or magnet. It is usually a round weighted planar driver (flat) mounted with a heavy surround. It is in the same air space as the active subwoofer driver. The passive radiator responds to the active driver moving because the air in the enclosure is pressurized either positively or negatively as the active driver moves. It is not in the same phase as the active driver because it takes a finite time for the passive radiator to respond to the movement of the active driver. This is the case for the Earthquake MiniMe DSP P12 subwoofer.”