Dear @uwiikz : I know you are really impatient/anxious in this new audio world for you in this new and very long trip full of opportunities and full of obstacles that want it or not you as all of us time to time make not one but several mistakes/falls. All those is part of the day by day learning.
You have a very wise dealer that puts in front of you to many excellent " candies for a child " ( like those A-250. ) that the " child " can’t refuse to eat.
You started this thread less than a week ago and rigth know you already made it your first system up-grade: to Miyajima Madake from Kansui, ", well that’s the way you are and the way audio is.
Now and " looking " of what you want and you are doing your next main action is to choose those 2 subwoofers ( yes always must be 2 and never only one. ).
It’s the most critical link in the system chain in the short and long time: we normally make changes in our systems through the years, changes in amps, cartridges, TT, CDP, cables, tonearms but subwoofers where these units normally lives almost for ever with us.
In the other side and I repeat again: we integrate subwoofers in our room/system not mainly to increment the bass low response ( that’s a good side line. ) but to improve the whole QUALITY level performance of that room/system and what we are listening at it.
The best room/systems are those that have the best bass range management/performance. Every thing good or wrong that happens in that frequency range modulates for the good or wrong all the system quality response.
Bass range quality is the most important frequency range in any room/system no matters what.
Rel is a bad choice, first because his response is very poor: -6db at 19hz and its THD is over 5% in the other side is a reflex design instead acoustic suspension that’s lower in distortions and with better overall response: tigther bass.
Of course that you have the Rel dealer at your place and knowing you when you can test it you will pull the triger. Do it a favor and don’t do it yet. Listen to it to learn a little about subs. Anyway you can buy it if you want, your choice.
" REL’s does a far better job of ‘disappearing’ and gelling with your main speakers. "
that statement is not only false but shows the low knowledge level that that gentleman has with the subs specific issue.
Look, if we have a good integration subs inside our room/system all subs " disappears ", period .
Years ago and way before in the high end forums audiophiles talked about subwoofers to listen stereo MUSIC ( people think that subs were for HT. ) I learned my first hand experiences and through several tests in my system and other systems till I learned that subwoofers is a true critical necessity in any " decent " stereo MUSIC room/system. In those years I started a thread in Agon here a highlight about that always is of interest for any audiophile that cares about MUSIC and quality reproduction of that MUSIC:
https://forum.audiogon.com/discussions/do-you-think-you-need-a-subwoofer/post?postid=310058#310058
I tested several subs including Rel and finished my " voyage " with a pair of Velodyne HGS-15 self powered subs that still today I’m enjoying and thatI don’t change it for any other in today market.
Velodyne has a patent for the subwoofer ( sealed/acoustic suspension design. ) can performs at below 20hz and over 100db SPL with an outstanding 0.5% THD, not even today any sub can be not even near that figure.
Velodyne subs sense over 20K times each second the woofer excursions to impede the THD goes higher than that incredible spec. This spec permits that you have the best quality level bass response coming from the Velodyne and that no other subwoofer design for home system use can shows you.
No, you can’t reach Velodyne because it’s not any more in business but making a little internet research I found out that thi’s an unexpected source for the last and latest Velodyne subwoofer design the DD-15.
""" I am concerned if blending the sub perfectly will be tough without built in room correction and I like the idea of cutting the frequency going to main speaker.. """
good that you are concerned about because that room correction is a must to have in the subs. Well this Velodyne has it and has a high-pass filter too:
https://www.referenceaudiovideo.net/velodynedd15.html
are the only units all over the world.I don’t know if the seller/dealer can ship to your country and I don’t know if you can wait for it. It’s worth to have these Velodyne subwoofers, big rewards for you and MUSIC.
Important issue: I think that before you start with the overall room treatment wait till you have in place your subwoofers, the ones you decided to buy: is up to you. Normally the 80% of the room treatment has a direct relationship with the bass range, it’s what it really counts.
Other main subject you have to take in count for optimum subwoofer quality levels is if you will integrate it using the subwoofer crossover to split the signal to the K300 or use an active external crossover for the K300.
If I was you my choice will be to make it through the Bryston ( the Accuphase looks very good too but works in the digital domain. ) external crossover and please let me explain about:
first Bryston is a first grade electronic manufacturer for many years, quality levels of the design is excellent.
second is that the Bryston unit has alternatives to choose the best one that fulfill the K300 frequency response needs that can mates the best with the subs you choosed.
You can choose between 6db, 12db or 18db crossover filter slopes where the first order ( 6db. ) is very convenient because you have no phase problems as with the higher slope order ones that are the ones that normally comes in the sub crossover.
It comes with an attenuator for the main speakers/K300 .
It’s a dual mono design, all separated for each channel.
Has several selectable high-pass frequency of your choice. I think you will need to test between 80hz and 100hz for the K300.
The subwoofers crossovers don’t comes with all those kind of alternatives and the quality electronics of its designs even that is good has not the high quality level like in the Bryston dedicated unit.
In the other side the subs has two options to be connected: one trhough the Bryston and the other is directly from the preamp if this unit comes with two output connectors and this is the best way to connect the subs: directly from the preamp.
Exist the very best way to make the K300 crossover and this way is how I wired/connected my whole system:
I did it with out active external crossover and certainly not using the sub’s crossover.
What I did was to make the high-pass filter in passive way at the amplifier ( pair of monobloks. ) input with a first order filter ( 6db. ) using a capacitor and a resistor of the best quality you can find out and that’s it.
Adding nothing to the signal avoiding any signal degradation but this alternative needs of a good technician to make the job inside the amplifier. I can do that because I have the electronic input board diagram of the amplifiers. Not all amplifiers permit to do it.
Btw, FM Acoustics is an excellent phono, preamp and amplifier Swiss manufactured with a quality levels second to none. Wise dealer......
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
You have a very wise dealer that puts in front of you to many excellent " candies for a child " ( like those A-250. ) that the " child " can’t refuse to eat.
You started this thread less than a week ago and rigth know you already made it your first system up-grade: to Miyajima Madake from Kansui, ", well that’s the way you are and the way audio is.
Now and " looking " of what you want and you are doing your next main action is to choose those 2 subwoofers ( yes always must be 2 and never only one. ).
It’s the most critical link in the system chain in the short and long time: we normally make changes in our systems through the years, changes in amps, cartridges, TT, CDP, cables, tonearms but subwoofers where these units normally lives almost for ever with us.
In the other side and I repeat again: we integrate subwoofers in our room/system not mainly to increment the bass low response ( that’s a good side line. ) but to improve the whole QUALITY level performance of that room/system and what we are listening at it.
The best room/systems are those that have the best bass range management/performance. Every thing good or wrong that happens in that frequency range modulates for the good or wrong all the system quality response.
Bass range quality is the most important frequency range in any room/system no matters what.
Rel is a bad choice, first because his response is very poor: -6db at 19hz and its THD is over 5% in the other side is a reflex design instead acoustic suspension that’s lower in distortions and with better overall response: tigther bass.
Of course that you have the Rel dealer at your place and knowing you when you can test it you will pull the triger. Do it a favor and don’t do it yet. Listen to it to learn a little about subs. Anyway you can buy it if you want, your choice.
" REL’s does a far better job of ‘disappearing’ and gelling with your main speakers. "
that statement is not only false but shows the low knowledge level that that gentleman has with the subs specific issue.
Look, if we have a good integration subs inside our room/system all subs " disappears ", period .
Years ago and way before in the high end forums audiophiles talked about subwoofers to listen stereo MUSIC ( people think that subs were for HT. ) I learned my first hand experiences and through several tests in my system and other systems till I learned that subwoofers is a true critical necessity in any " decent " stereo MUSIC room/system. In those years I started a thread in Agon here a highlight about that always is of interest for any audiophile that cares about MUSIC and quality reproduction of that MUSIC:
https://forum.audiogon.com/discussions/do-you-think-you-need-a-subwoofer/post?postid=310058#310058
I tested several subs including Rel and finished my " voyage " with a pair of Velodyne HGS-15 self powered subs that still today I’m enjoying and thatI don’t change it for any other in today market.
Velodyne has a patent for the subwoofer ( sealed/acoustic suspension design. ) can performs at below 20hz and over 100db SPL with an outstanding 0.5% THD, not even today any sub can be not even near that figure.
Velodyne subs sense over 20K times each second the woofer excursions to impede the THD goes higher than that incredible spec. This spec permits that you have the best quality level bass response coming from the Velodyne and that no other subwoofer design for home system use can shows you.
No, you can’t reach Velodyne because it’s not any more in business but making a little internet research I found out that thi’s an unexpected source for the last and latest Velodyne subwoofer design the DD-15.
""" I am concerned if blending the sub perfectly will be tough without built in room correction and I like the idea of cutting the frequency going to main speaker.. """
good that you are concerned about because that room correction is a must to have in the subs. Well this Velodyne has it and has a high-pass filter too:
https://www.referenceaudiovideo.net/velodynedd15.html
are the only units all over the world.I don’t know if the seller/dealer can ship to your country and I don’t know if you can wait for it. It’s worth to have these Velodyne subwoofers, big rewards for you and MUSIC.
Important issue: I think that before you start with the overall room treatment wait till you have in place your subwoofers, the ones you decided to buy: is up to you. Normally the 80% of the room treatment has a direct relationship with the bass range, it’s what it really counts.
Other main subject you have to take in count for optimum subwoofer quality levels is if you will integrate it using the subwoofer crossover to split the signal to the K300 or use an active external crossover for the K300.
If I was you my choice will be to make it through the Bryston ( the Accuphase looks very good too but works in the digital domain. ) external crossover and please let me explain about:
first Bryston is a first grade electronic manufacturer for many years, quality levels of the design is excellent.
second is that the Bryston unit has alternatives to choose the best one that fulfill the K300 frequency response needs that can mates the best with the subs you choosed.
You can choose between 6db, 12db or 18db crossover filter slopes where the first order ( 6db. ) is very convenient because you have no phase problems as with the higher slope order ones that are the ones that normally comes in the sub crossover.
It comes with an attenuator for the main speakers/K300 .
It’s a dual mono design, all separated for each channel.
Has several selectable high-pass frequency of your choice. I think you will need to test between 80hz and 100hz for the K300.
The subwoofers crossovers don’t comes with all those kind of alternatives and the quality electronics of its designs even that is good has not the high quality level like in the Bryston dedicated unit.
In the other side the subs has two options to be connected: one trhough the Bryston and the other is directly from the preamp if this unit comes with two output connectors and this is the best way to connect the subs: directly from the preamp.
Exist the very best way to make the K300 crossover and this way is how I wired/connected my whole system:
I did it with out active external crossover and certainly not using the sub’s crossover.
What I did was to make the high-pass filter in passive way at the amplifier ( pair of monobloks. ) input with a first order filter ( 6db. ) using a capacitor and a resistor of the best quality you can find out and that’s it.
Adding nothing to the signal avoiding any signal degradation but this alternative needs of a good technician to make the job inside the amplifier. I can do that because I have the electronic input board diagram of the amplifiers. Not all amplifiers permit to do it.
Btw, FM Acoustics is an excellent phono, preamp and amplifier Swiss manufactured with a quality levels second to none. Wise dealer......
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.