I was always curious about these amps! That 4ohm stereo efficiency was insane for 1992!!! Great video as always

Tell Doc and Marty to keep going back in time and bring more of these old school amps. Show these youngsters how we did it before they were born.

I installed a DPA 2300 and DPA 275 in a Mercedes for a customer when I was at Ramstein AB back in '97. The DPA was powering 2 Kicker Solobaric 12" and the DPA 275 was powering MB Quart 3-ways (6.5"/3"/tweeters). It was very difficult because of the fuel tank location in the Mercedes, but once I worked around that, it sounded awesome!

Cool to see this amp tested!i had one (think in 93-94) it ran 2 pioneer 6x9s in my Chevy chevelle (1973).it did pretty good with my alpine cassette deck!omg were old buddy

Holy shit! You continue to blow my mind with the old school amps you get your hands on. Yeah, they were massive and not very efficient but so many memories.

I remember seeing this amp in the Crutchfield catalogs and the write up about it in Car Stereo Review. It seemed really cool but was out of my price range as a teenager back then. Very cool video!

Love seeing you review old school classic amps!

If it sounds good to Big D? It's good for me! Thank you for being one of the few that listen to the amps instead of just giving us numbers. Numbers are nice and all. But they just don't tell the whole story or when used in real world applications and speakers. I did however notice the high end was a bit boosted for my ear in the pants seat. But nothing bad as far as I can tell from the short demo in the video. Amazing how this Car amp still works after all these years. Its not often things last as long as they did back then when your talking about consumer grade electronics in general. Excellent work as always!

I have heard of infinity but not an amp like that. I was pretty impressed with it overall.

The funny part being that you can wander onto Amazon and get that power in a class D for about pennies now.... time flies.

Love these old school equipment from my Era. 👍

Sounds good. I also remember these back in the 90s

No way, I had one of this amps back in the days 90’s bought it from a technician that worked on amps that work for Jbl in northridge ca and found out then they also make Infinity and Harmon kardon and of course jbl all made there, I had this amp running with two 10’s was picking them up really good was looking for one last time see if I can find one and you come up with the amp video 😂 good to see this amps are still out there very very rare amps, good videos like always. 👍🏻

Beautiful amp and the build quality looks solid!

That build quality is excellent

I’m just so amazed at how fast you can press the buttons on the Dyno, all while speaking perfectly. ❤

Wow, that's so unique. I've never seen that before. Awesome video.

I have one of these. Great little amp.

That’s got to be a rare amp!

I had a couple of the DPA-275 units. The were great little amps, not huge power, but sweet & efficient. Great for a mid-tweeter combination. They were not recommended for lower impedance loads as the frequency response rolls off.

On the topic of class D, I replaced a newer a/b phoenix gold amp in my car with a phoenix gold class d for higher rated power and noticed the sq drop when I did. I wouldn't run class d this old, but it's still super cool

See the 1993 Car Stereo Review Article: bit.ly/3lV9wER *Shop (affiliate links):* ELAC Debut 2.0 B6.2 Speakers: amzn.to/3gcZHiC SMD / D'Amore Engineering Amp Dyno: goo.gl/sJTcf7 XS Power D1400 Batteries - amzn.to/2BPFCKW XS Power PSC60 Charger - amzn.to/2CHGcfs Fluke 1000A AC/DC Clamp Meter: amzn.to/2Rw5WDA Handheld Dyno: amzn.to/2u2EgKV My Favorite Screwdriver Kit: amzn.to/2x0VzcE _DISCLAIMER: This video and description contains affiliate links, which means that if you purchase from one of the product links, I may receive a small commission. As an Amazon Associate I earn from qualifying purchases_

I'm not sure why/how I wasn't subbed to this channel but I am now. Thanks for the cool stuff, as usual, man.

"Stereo Review magazine was definitely for car audio enthusiasts.

Wow, I'm literally looking at a DPA-275 on my desk right now!

Nice... I always thought MMATS and BLADE came out with the first Class D jobs... Never considered the Infinity offering... RARE... 1991 was a year of advancement in car audio. BDBD/2022

I remember this small boutique in N. Alabama had these and some Focal speakers on the wall. Looked so nice.

In 92, I bought a kenwood 921(75wattsx2) the thing was the size of 2 of those, and it came with a fan for a 200watt amp. Sherwood BP amps didn't recommend 2ohm stereo either

I installed some of these back in the day. Was expensive in NZ and was kind of harsh sounding. We were an Alpine and Rockford dealer as well.

I had a system with 4 of these. A 3way setup in the front with one DPA running the tweeters, another running 3 1/2 mids and two bridged powering 7 inch midbasses. All controlled by a PIoneer ODR system. Bass was two infinity self powered 10inch subs. Everything class d and it sounded great, anyone who says other wise doesn’t know what they’re talking about. These replaced a McIntosh MC440M and I didn’t miss the McIntosh at all.

Great videos man. Can't wait on the JP83 dyno

Never seen this amp before pretty cool

I really love infinity products especially their speakers I have a set of infinity overture three speakers with self powered amplifiers in them Amazing it’s too bad they don’t make stuff anymore I don’t really understand why

Awesome video!! I have three of these amps, (one is still a virgin). Also have a Nucleus with the optional fader. Thanks for doing what you do!!

Sorta reminds me of the "Nucleus" crossover that Infinity made around the same time.

I LOVE that generation of Infinity speakers, the Betas are simply amazing speakers. To this day I still run a 30 year old pair of EMIT-Ns in my car. Installed a lot of their stuff in the 90s but was never a fan of those amps. They just sounded weird and muted while also being sharp if that makes any sense. lol

Great seeing amps I couldn’t afford back then. Made do with home speakers and and autozone eqs

Love the old school amps !!!

Always cool to see something different 😁👍

I can't imagine the assembly process of that amp from the factory.

I used to have that amp! I also had the 250. I also had a couple of Carver amplifiers, a PPI 2150AM, and a pair of Orion HCCA 225s. I'm old...

Tripath filed a patent to make a Pulse Width Modulation (PWM) Class D amplifier in 1996. That’s the modern Class D design we all know today.

In 1995 I seen speakers that could take more power than today amps too

Great stuff, keep ‘em coming. Would love to see some old Sherwood, deltasonic, alphasonic, and proline

Love it, imma big Infinity fan 😍

It sounds better than that critical mass you tested.

Infinity makes good home audio and has good vintage stuff. Not saprised at how well this amp did.

I remember when that amp came out

That's so interesting to see this amp

What's funny is that amp is probably older than many subscribers of this channel. Lol. I remember the DPA amps but, never saw one in a install back in the day. In 1993 the bigger names like RF,, Orion, LP, etc. we're the gear everyone wanted to run. Infinity was considered ultra high SQ.

Infinity for the win! I might be a tad biased. You need to test the Infinity Beta 300 I have.

I have always been any Harmon product fan. I am running Infinity Kappas in my Benz. New-old....Infinity has always made great products. Great content. If you have the opportunity to test an Xtant 403 amp, Xtant 1044dvc sub, or Boston Acoustics GT22 amps, I would love to see your results. Just some of the old school stuff I have. Thank you

Nice. Funny how that works, use the amplifier as the manufacturer intended and it will sound just fine. I've always been a fan of most things from the Harman Kardon group including Infinity.

Those early digital amps where voodoo stuff. Honestly I never gave it a chance back then but ironically it's all I run nowadays.

Infinity Capa has always been very good, but not overly popular. They've always been kind of a mystery at a high price. At least in my area.. Maybe that is different elsewhere..

All class D amplifiers are designed with a low pass filter on the outputs and most are designed for a 4-ohm load. Similar to the Infinity graph, if you use a 2-ohm load, the low pass filter will shift to a lower frequency when it comes into effect. If the low pass filter is in an audible area of the frequency range, then you will notice a diminished high-frequency response. It is unfortunate that this information is no longer passed onto the end consumer to educate them. On a side note, looks like that used a great OP-Amp at the time, the tl084cn which is still used on the Ti label today on many amplifiers. That was ahead of its time, kudos to Infinity.

Harmon one of my favorite manufacturers just because always price friendly and do rated if not more. I'm still disappointed in myself for selling my 611a for like 30 bucks 😔

Them be some white legs D😂😂 Great content as always. The efficiency at 4 ohms blew me away!

I like infinity but you struggle to find anything in the UK these days. Had various infinity sub's back some 20 years ago and loved my perfect 12's and I still have a pair of kappa 50cs components that refuse to die or even show signs of degradation after 20 years, well the main drivers, the tweeters have been replaced many times over lol.

Love the videos!! Especially the old school stuff. Can you acquire a Blade Digital amp from the 90s? Would love to see a Dyno on one.

I remember this amp from the Crutchfield catalogs.. oh my..

Way cool amp D thank you!

This is not only the first full range class D, but probably one of the first class D, period. Not too long before this they transitioned from vacuum tube to transistor.

Still love the mtx blue thunder the best.

Picked up a Phoenix Gold M25 Yesterday at the thrift store . went back in time 2015 when you did a dyno drag race with a Fosgate .BOOYEE That was hard to watch you doing your AM radio DJ voice .

Hi I’m a big fan of all ur videos and appreciate all the hard work u put in all the things u do. I just got one question well just I have been wondering what u do for a living just curious thanks man 🙏🙏

On the same uncommon subject as this old class D amp, I'd love to see an old Blaupunkt class T amplifier get tested. Something like a PA2150.

Is this maybe they first clases D car audio amp in they history of the car audio?

Did you notice the voltage was different with the wattage on the stereo test

hey big d i got a question how did they get rms numbers back in the 80 and 90s without an amp dyno.

Great video

Nows the time to start doing electrical Frequency response measurements and graphs for us. At 4 down to the stable ohm load. Let’s find out if they Lyin to us!!

What's in the box? What's in the box? Awww what's in the boxxxxx??! What's in the Fing box?!

These things have so much in common with the Blade SE series. Especially how it slides into the heat sinc. I wonder if this isn’t even a BASH amplifier. It would account for it sounding good because the output is A/B with a class D power supply. I’m really curious now because class D, even in the late 90’s, did not sound good.

Not a fan of D Class but this one doesn't sound too bad. It has some clear headroom issues but it works. AB for me.

Thanks big D! :) i like the design of that one! neat little package. Back when infinity was still their own! Bought an infinity/jbl a while back and man, it was SUPER disappointing, wound up shipping it back to crutchfield and getting an alpine, much better choice!

Nice bro 👌

That 2 volt RCA input 🤣

At one time had the dpa 250 on two mtx road thunder 12s

They sounded different when they came out because every body was use to ab amps, in this age of blue tooth and mp3 it sounds fine.

If you remember Blade Technologies had BASH amplifiers BASH is a form of AB and Class D Technology Back in the 1990’s .They had big amplifiers Power wise That were thin and 1/2 the size of regular amplifier Do you remember Blade Technologies ? They were black amplifier with a red light that was down the front .

Why do some amps have more wattage on one channel then the other

People saying it sounds bad I would put money that some have never even listened to the amp also that is a great example of conformation bias people reading something and believing it so much it affects their perception of something

Very cool.

ive been wanting a infinity amp for awhile now, they just dont come with a bass knob so its alil inconvenience for some genres of music

I can smell that box from here...

Tell me thing wasn't designed to be mounted under a seat. As for sound quality I think it sounds ok but soooo many variables involved. It might be a little bright but it didn't seem muddy or incapable of driving the speakers. Digital will always suffer from square waves but it can sound very warm with good drivers.

Installers love Infinity

Do miss soild stereo system 70s

I have yet to see any Sherwood amps yet. Wonder if a Sherwood could bump the Phoenix Gold 🌀 Cyclone ??

Cool! Whats the most efficient amp you've come across?

Growing up I always loved alll there equiptment it was always like fancy and expensive like more then alpine lol I’m 46 @10:46 imm outta herrrrrr

Battlestar gallactica styling..cool

Can you find any imfornation on the first infinity basslink t, i seen one and by the time i bought it it was blown

Very cool amp review, but am I missing something? Shouldn’t 4 ohm mono be equal to 2 ohm stereo, which the amp protected in? How do both channels continue to see 4 ohm with the amp bridged at 4 ohm?

Wounding what amp had the first clip indicater/light and how accurate it was? Btw cool looking amp.

This was before the Harmon take over if i'm not mistaken?

Big D. You keep up with any social platforms

Weren't these sold at crutchfield?

Nice