@0:25 "Elizabeth, I'm coming home! ... I remember The Jeffersons" I remember Sandford and Son.

I added a REL to my setup earlier this year and it has been a game changer for my system! Largely because of your videos!

I have 2 SVS SB-4000 subs and they have Class D amps. Love them.

It'll be interesting to see/hear a sub with 4" excursion. That's a LOT of inertia to have to control. Will they be servo controlled to tighten up the response?

Nowdays i have mostly been using my sawafuji sfi-10 to binge listen to these videos while at home.

Jl Audio already has subs on the market with a 4" peak to peak excursion. Twin 13.5" subwoofers in their Gotham enclosure.

Class D has absolutely changed in technology from its early days.

Pretty sure REL uses both.

Class D is switching the current digitally and if the switching frequency is far higher than the audio frequency, the output can be precise. For treble up to 20kHz you will need 100s of kHz of switching. For example around 500kHz can make treble reproduced with very low distortion of less than 0.01%.

People need to except the fact that there are great sounding class D amplifiers.

You should call your subs Raptor after the truck because of all the suspension travel. I have a REL Strata II paired with my ProAc Tablette Sigs.

Doesn't the Rel predator line use Class D amps?

Biggest issue with replacing the stock sub amp is if it has alot of DSP involved. But for just switching it out I would go for class D for a sub any day. More power at a lower power consumption because of the brilliant efficiency of 90+ % compared to about 50-60% efficiency for class AB. And it's just deep bass.. Not mids and highs. So it has a bit less impact on the deep bass a sub deliver even if it is a cheaper component amp. Power is more important in that low freq area.

You don't necessarily need excursion to get the low bass

my 300$ Earthquake dbxi12d has 3.5" excursion, sounds amazing too with 500Wrms class d L50 amp from aliexpress... Class D is perfect choice for subs, way more efficient and cheaper since we don't need that quality of A/B amp for low frequencies.

The real irony is that REL makes one of the fastest subs on the market (with class A amps), but at the same time, they are not the known for max output or the lowest frequencies any more (Thus is the trade off possibly?)...as they are designed with the intention for 2 channel audio in mind primarily. REL did used to make one of the deepest or lowest frequency subs ever, over 30 years ago that were ideal for pipe organ music, and damaging the foundation of your home, as you had to sign a release form to purchase. If I remember correctly they ran twin 5" drivers in a internal multi chamber, channeled large enclosure? The problem was, and still is today, to play 3Htz you need a large volume room to hear that frequency hit in it, the output is low so you need multiple & the price was audiophile shocking; plus the time alignment or speed was slow/delayed significantly as it was not really tight bass either. Back in the early 1980's there was only one other sub that could come close to the low frequencies of the REL. A Canadian company produced a servo 15" sealed sub, that went down to 10Htz ish; but to be fair it is significantly outside of the ball park of 3Htz big time. That servo 15 corrected a couple issues that plagued that classic REL sub though, it was fast and tight and could hit in a room half the size too. Servo's back then were plagued by failures and lead to the demise of the servo 15 sadly; as nothing ever has ever come close to its experience that it delivered with such single deliberate authority and power. The servo 15 had some other issues as well, sealed tuned enclosures have a very efficient but limited range so it hit hard from 10Htz to 30Htz and dropped off fast outside that range. There is a California servo sub woofer company that tried to over come this problem with it's limited 1812 sub years later, that had an 18" and a 12" sub in a single divided enclosure; it was cool and impressive but limited probably because it didn't really solve the problem of a truly full range sub woofer well enough still. I have to commend Paul and Chris for their desire to even wanting to produce some of their own PS Audio subs! The challenge is real, and my expectations are high for them; especially when they are aware of the experience near field large bass drivers can provide to help overcome full sub range issues (like room volume); as well as digital tuning for time alignment and flat EQ response. If the range of FR 30's are any indication, the bar is about to be significantly raised for bass heads.

Sanford and Son Redd Fox did the "Elizabeth, I'm coming to join you" not the Jeffersons. If memory serves.

Class D amp should be able to run cooler as well as giving more wattage due to it being more efficient. But certainly a Class A/B for mid's and high's is the way to go. Just try to look for more efficient speakers for your mids to help make up for the loss of wattage due to the A/B amps inefficiency. Or simply more powerful amp.

Hi Paul, My REL S 812’s have class D amps. I believe the higher end models use class D. It seems that The lower cost REL subs use class AB

@paul Rel S series & above is Class D

Why does PS audio keep making snake oil power conditioners?

Class D amplification is very common in bass guitar amplifiers😉👨🏻

It's the big one Elizabeth honey. Not the Jeffersons… Sanford and Son

Get a passive sub and power it with another monoblock

*Sandford and Son. Don't joke about a heart attack. That's how Redd Foxx died.

Most current model REL subwoofers are class D.

My Carver True Subwoofer is no new kid on the block yet it must have a class D amplifier inside because it's specs out at 2700 Watts. Bob Carver was no kid on the block either when he created this sub. Physicists can make great audio designers.

4" excursion?? Well, that a fan.

REL's highest end subs use class D

I was 'Sanford & Son', not The Jefferson's. . .

OMG. The World is coming to an end.

Whaaat..? A 4 inch Xmax pk-pk...? What size of cone area.. and above all what about the weight of the magnet structure...! Oh man ... this sub will require a forklift truck to move it! Who would buy it ?

I don't use a sub and feel left out

Classic case of visual bias. The sub was absolutely fine before he found out it was class D, but now.... If it works well together as it is, then you must accept that there is something right about the way the product was implemented. Let go of the bias and be a much happier, more stress free human.

Class D.

ONLY the Tx subs are A/B... *all the rest* are class D

Paul you are incorrect. REL has subs with class ab and class d. Maybe gather the correct info before you make a video. Just a thought. When people watch a KZfaq channel they arent looking for a guy guessing like hes pulling straws out of a hat.

4 inches of excursion. Lol! Not needed at all. The guy goes on to brag about it and belittle other subs that dont move that far. Let me guess. You'll make a 5k to 10k sub...think it's so great because it has 4 inches of excursion. Then we will all buy REL, SVS, and Monoprice Monolith subs for a fraction of the price and are elated with the performance. Paul, I'm not impressed.

Sanford and Son