Thank you for reaching out. When connecting using the High Level input there will be no wires making contact with more than one amplifier terminal at a time. One wire will connect directly to one positive binding post, a second wire to the other positive binding post, and a third wire connected to a ground point. As a result, as long as you practice a normal amount of caution then there will be no risk of shorting your amplifier by using the High Level input connection.

Thank you for reaching out. The T/9x Red can pair very well with your Klipsch "The Nine" speakers, and since these are active speaker with a built-in amplifier it will be best to connect the REL using it's Low Level input to the RCA subwoofer output jack on the speakers.

@@RELAcoustics thank you! I will be conjure with the speaker and subwoofer settings…

Thank you for supporting REL, and we are glad that this video helped to answer your questions about connecting the High Level cable for the T/7x! As the video shows, both the High Level cable for your T/7x and your main speaker wire will be connected together to the output terminals on your system's main power amplifier.

Thank you for reaching out. If you have found that one of the subwoofer outputs on you AVR is not functioning correctly, then you could use an RCA y-cable so that both of your T/5is receive signal from the same functional subwoofer output on the receiver.

Thank you for reaching out. When you have a chance, please write in to [email protected] and our team will be happy to provide a subwoofer pairing recommendation specific to your system.

@@RELAcoustics WOW, thank you! <3

It depends on the size and dimensions of your room, though when you have a chance feel free to write in to [email protected] and our team will be happy to assist.

When you have a chance, please write in to [email protected] with the model of amplifier that you are using in this system, and the model of REL subwoofer, and our team will be happy to provide High Level connection advice specific to your application.

Thank you for reaching out, and for supporting REL. The T/9x and Classic 99 are fairly different in their design, and and the ideal choice for your system will be dependent on other variables. When you have a chance, please write in to [email protected] with the model of main loudspeakers that you are running and the dimensions of your room and our team will be happy to assist.

In our experience the T/5x will be a better option for pairing with your Dali Menuet SE speakers, due to it's faster and more responsive output compared to the Tzero. If you have any additional questions about subwoofer pairing for your system then feel free to write in to [email protected] and we will be happy to assist.

It is difficult to directly compare these two models purely based on driver surface area, since the drivers are designed differently and used in different ways. For assistance with determining which of these models will be the best match for your home audio system, please write in to [email protected] and our team will be happy to assist.

Yes, the phono ground screw on your amplifier is a perfect place for connecting the black High Level wire to.

The High Level input on our subwoofers is only intended for use with passive speakers, where the High Level cable can connect to the power amplifier's main speaker output terminals. When using a REL subwoofer with active speakers, where the power amplifier is built in to the speaker's cabinet, it will be best to use the Low Level input connection.

Removing the third prong of a power cord will defeat the device's safety grounding, which in a worst-case scenario can result in physical injury especially with high-powered devices such as an audio amplifier. Removing the third prong of the power cord can also result in performance issues for the subwoofer, and will void it's manufacturer's warranty.

@@RELAcoustics My question is "How will it injure you?" I realize there's a Grounding issue and possible fire hazzard - but how will kill you Directly??

@@xtraflo If you defeat the safety grounding for the subwoofer's amplifier through the third prong of it's power cord, then in the event of a rare malfunction with the amplifier it is possible to voltage to build up within the subwoofer since it no longer has a ground return path through the power cord. Then when you touch any metal surface on the subwoofer, your body will become the "path to ground" and the built-up voltage will travel into your body. This is very rare, but can result in damage to the subwoofer or physical injury in a worst-case scenario. The third prong of the power cord is a safety feature, and removing it will not only void the subwoofer's warranty, but will also make you liable for any potential injury.

The Airship II can be used with any REL in any situation. Anytime your electronics are far away from a REL the Air Ship II can be used.

@@RELAcoustics i am not talking about the airship ii. I am asking if the 1205mkii is suitable for full range center speaker channel instead of a t7x.

@@Cleric996 The T7/x is better because you can connect High Level to the Center Channel output on your amp. If you went with the HT you would have to connect to the Center Out RCA and not all processors have pass through like that. You will also need a Y-adaptor on the REL side to double signal strength mimicking a L and R signal path but with only your center.

@@RELAcoustics or i could use the airship ii, connect the 1205 mkii with the center speaker and go full range, right? But my main question is whether the 1205 mkii or the t7x is suitable for full range with the center speaker from a sound perspective. That is why i mention that i have two S510s for L and R speakers.

...both connected with high level and LFE.

Busted!!! We didn't have electrical tape on hand however we felt any tape would have demonstrated the principle we were trying to express.

Thank you for reaching out. The phono/turntable ground thumb screw on your integrated amplifier is a perfect place for connecting the black High Level wire to, and if needed you can connect multiple black High Level wires to the same screw.

Rattle something fierce 😮

use some clear rubber pads to raise the glass just enough to clear the emblem.

Thank you for reaching out. Unfortunately we do not have Classic 99s available without the top badge, though in theory you could use felt or rubber pads under the glass plate so that it is not resting directly on the top badge. That being said, since the Classic 99 is capable of producing significant low-frequency output it is possible to this glass to rattle during operation of the subwoofer.

Generally, peeps buy in pairs U don't have to go as loud 😊

from, my understanding of these, and i have one, no you would want one of their hi end, sealed sub's. these are a bit mushy sounding compared to their other line. more of a classic boomy sub then a hi end fast details sub. of course i'm going to the extremes with my description

Thank you for reaching out. When you have a chance, please write in to [email protected] and our team will be happy to provide a subwoofer pairing recommendation specific to your system.

Thank you for reaching out, and for supporting REL Acoustics. The best option for listening to a top-level audio system in a well-treated room is to visit a dealer in your area, and a full listing of authorized REL dealers can be found on our REL.net website. Fortunately today there are many options for finding high-quality source material, though generally speaking digital files downloaded to a hard-drive, or physical media such as a CD or Blu-Ray disc, will provide the highest fidelity of playback quality. At the end of the day, your ears will be the best judge for determining if your own home audio system sounds as good as it can in your own listening environment, and provides as much enjoyment as possible.

@@RELAcoustics Thanks for the reply, but somewhere on planet Earth there must be a system that is the "Gold Standard" for quality. If not, then all systems are good. Yes, good is subjective. But, there must be the one that all others are gauged by. I'm a machinist; If I make part to replicate another part exactly then my parts must an exact replica of the original part. Sure, audio in the air is difficult if not impossible to exactly reproduce, but someone must have gotten really close. I wonder who that could be. Thanks again and all the best.

Thank you for reaching out, and that is correct. The High Level input is a speaker-level connection, and can only be used when connecting to a power amplifier in a system with passive speakers (speakers powered by a separate amplifier). If you are using active speakers with a line level RCA output, then it will be best to connect the REL sub using it's Low Level input.

Thank you for reaching out. Cement floors with carpeting over it will not have have a detrimental impact on the low-frequency performance of your home audio system.

Thank you for reaching out. Since you are using active speakers, it will be best to connect using a standard RCA-to-RCA cable from the subwoofer output jack on the speaker to the Low Level input on the REL subwoofer. The Low Level input is designed to receive a line level signal, such as from this type of sub-out, while the High Level input is designed to receive a speaker-level signal from a power amplifier.

@@RELAcoustics thanks

@@RELAcoustics Thank you. One more question. Theres information on the internet that suggests to connect active speakers to subwoofer through LFE to let the crossover be done on the active speaker side. REL suggests to connect it to the low level input port. What would be the correct way?

@@Gragon There isn't an inherently correct or incorrect way, and the ideal choice will depend on your active speakers and your own personal preference. If you wish to use the Crossover filter within the REL to tune it's output to blend with the main loudspeakers, then connecting to the Low Level input will be the best choice. If you wish to use the filtering options (if any) within your active speakers, and to bypass the REL's Crossover filter, then the .1/LFE input will be the best choice. We recommend connecting to the Low Level input, though the best option will be to try both and see whichever sounds best to you and in your room.

@@RELAcoustics thank you

Thank you for reaching out. One end of the High Level cable fans out into three bare wires, which connect to the output terminals on your amplifier, while the other end features a SpeakOn/NL4 Plug which connects to the High Level input jack on the subwoofer's rear amplifier panel.

Thank you for reaching out. The High Level input for our subwoofers is not a differential connection, and the black wire of the High Level cable does need to be connected to an electrical ground reference point. In addition, it unfortunately is not possible to safely connect a single subwoofer using it's High Level input to two monoblock amplifiers at the same time. Doing so will often result in a significant ground hum which can be near-impossible to eliminate, and in a worst-case scenario can result in damage to the subwoofer and/or the monoblock amplifiers. Stereo pairs of subwoofers can be connected High Level to monoblock amplifiers, with one subwoofer assigned to each amp, though with a single subwoofer we instead recommend connecting using the Low Level input to open outputs on your preamp. For more information about connecting your REL in this system, feel free to write in to [email protected] and we will be happy to assist.

​@@RELAcoustics Thank you so much for an exceptional answer that is knowledgable, honest about the limitations of the product and with a specific solution to my use case. Looking forward to paying you for my next sub. Good CS pays of, keep up the great work.

Thank you for reaching out. The High Level input on our subwoofers is designed to not place any current load on the amplifier, and to not draw any amplifier power away from the system's main loudspeakers. Instead it will only be drawing a small amount of voltage to then be fed and amplified through the subwoofer's own built-in amplifier. As a result, the High Level input can certainly be connected to and used with 25 watt amplifiers.