Please recommend a receiver/integated/seaprates for JBL studio 530.

Dave-b, I went with the little brother of the 801, the 301 and i’m very happy with it. very good match.  

Yamaha AS-801...MD for $899!

I have bought 530s late last year and matched them with Denon pma 2000 ivr integrated amplifier since day 1. I got this amp as used at $400. Later I have added JL audio sub dominion 108. Listening to LP records most of the time using the amp’s phono stage. Pretty happy.

Take a look at Indy Audio Labs Acurus Aires. I have had one in my system for over a year now. It's $4499 retail but worth the investment.
It's has a very detailed overall sounding edgy or strident. It has a tight bottom end, very open  midrange and a sweet high end. 
It is 200W x 2 into 8 ohms 400 x 2 into 4 ohms has a sub output and it's 2RU.high. 

So I ordered the Yamaha A-S301.  Thanks to everyone who chimed in. 

Maybe the Denon PMA 800 NE integrated and it's close to your budget. Below budget if your ok with refurb (Accessories4Less).  Also Sean from Zero Fidelity did a review of the amp.

Acin 25 WPC RMS hybrid Bluetooth power amplifier paired with Suca Audio T1 tube preamp/line stage. Great sounding combo package. 

I have the NAD C372 integrated.  It's ok, but not a great match.  I may just try out the Yamaha.  

eBay has matched pairs of English made CEI  brand tubes for $9.50 + $4.64 shipping listed. 

If you get the cheapie, be sure to swap out the Chinese tubes for a US or Russian pair. Mine has a matched pair of Riverstone Audio 5654W tubes; $29.99 on Amazon. I happen to like the clear acrylic case. If you have access to a tube tester and can do your own tube matching, the individual tubes start at $9.95 each for current production GE tubes. 

We’re it me for those speakers and the given budget, I like the NAD recommendation. 

https//www.google.com/amp/s/m.aliexpress.com/item/4000215235804.html

some pics and specs. I’ve got one in a bedroom driving a Fosi T20 and a couple Dayton Audio 6.5-AMT speakers. Sounds pretty good to me. If you wanted to upgrade a bit, Douk Audio makes essentially the same amp in a fancier box for $59. 

I agree with blainer55 on Yamaha. There have been quite a few mergers in the home theater integrated amp market, including Denon with Marantz who were subsequently purchased by Sound United LLC and Pioneer bought by Onkyo. Sometimes (but not always) with the mergers, the new owners use cheaper components because all they were really after was the name. Yamaha has remained independent and has the highest reliability ratings of any home theater integrated amp manufacturer. I've read about quite a few problems with Denon HDMI connectors and other issues with the other manufacturers. I rarely if ever read about problems with Yamaha. My suggestion would be to look for a previous year's model that has everything you want but has been heavily discounted. 

Lots to consider here, guys, except for the $14 tube pre-amp bob suggested.  that's just plain scary!!!!!   

There is a used Denon DRA-355 on ebay this morning for $55. FYI

Crown power amplifier and Semoic Audio 6j1 tube preamplifier. 
Depending on which Crown you get, you can easily stay under $500, especially on Amazon.

I’ve got their 145 RMS WPC version and paid $249 for it used. They still have a couple more in stock. 

The preamp only costs $14.64

If you need an FM tuner, there’s a fabulous bargain in the Minlia HDTV FC0012 USB RTL 2832U SDR Tuner dongle stick DBB-T + DAB + FM + TV receiver. $16.89 plus tax on Amazon. See my post in the “diminishing returns” forum thread for why I like it. 

Yamaha makes some nice integrated amps in your price range. I had one driving my older IMF's that I was happy with. Gave it to my son when I got classic Marantz separates.

This NAD is under 500 bucks!
https://www.musicdirect.com/integrated-amp/NAD-C-316BEE-V2-Integrated-Amplifier

If you want to go with a receiver for audio purposes, try out a big Onkyo receiver from about 6 or 7 years ago.  My TX-NR 809 weighs 40 pounds and has all manner of balls to it!  Still works perfectly.  I see one on e bay for $359. 

Or even something like my old Yamaha RX-V1800 receiver, which weighs about 36 pounds and sounded great. 

OK, I'd like to keep this under $500.   That Denon receiver was about $250 brand new, at least 10 yrs ago.   I'm not trying to be a tight wad, but this is my secondary system. I'm convinced that i can get a similar sound as the 355. The problem is, with what???  If I'm gonna spend upwards of a grand, I'm getting a new pre-amp for my main rig, which i don't want to do just yet. 

Rogue Cronus Magnum would be a very nice match.

A different way to go with great sound and all the digital and analog inputs you might ever want is Bel Canto c5i.

Yogi:  I've tried a much newer Denon and it came up short, man. No guts whatsoever. Really disappointed cuz i thought it would better the small Denon. 

54:  I have the 590s and are perfectly happy with that set-up.  I'm looking for a match for my 530s.  I appreciate it, though.  That Black Ice looks sharp!!!  A bit more than what I'd like to spend for my 530s.
 
Miller:  I've had good tube amps in the past.  Shame I don't have one now to try them with the 530s.  They might be the answer.  Who knows?

"PS- in the time it took me to write this yogiboy obliged with just what was expected. So I was right. Yet again."
@millercarbon
You’re a legend in your own mind!!!!!

I have JBL 580 speakers. I had very good results with this amp Black Ice 
Fusion-3502P.
Underwood hifi has this integrated on sale
gor $1100 regular price $1800.
check it out
https://www.underwoodhifi.com/specials

Well the problem is instead of looking for a good amp you're looking for an amp that will make your speakers sound good, which is another thing altogether. I mean its fine if that's what you want but are you sure?

The sound you're looking for, "lush, liquid, juicy" yet with punchy tight articulate bass is kind of a tough combination- especially in a cheap little receiver. (Your words not mine.)

Let's say you find it. Its only a matter of time before you either tire of this lush sound, or the speakers go or you upgrade them, or something (anything) changes and you're confronted with the reality you've got a way lush of center component in your system. Then if you do what the system matching guys are always saying, you will find another flawed component to offset and counteract the majorly flawed amp you just worked so hard to find.

There's a whole slew of guys here usually leap at the chance to tell you what to buy. Probably the CCP virus has everyone off their game. They'll be along. Trust me. Anyway that's not my style.

I had JBLs for years. Decades. Ruined me. Got it into my head they somehow sounded good. By the time I sold them it was like an ice pick in my ear. Just my way of planting the seed that the preferences you have right now might just maybe change in coming years.

You might maybe want to look around for affordable integrated amps. With tubes, if at all possible. Or if not then at least listen to some. If only to let you know what a good amp is supposed to sound like. So instead of trying to find what you had, you maybe find something better.

PS- in the time it took me to write this yogiboy obliged with just what was expected. So I was right. Yet again.

Since you like the Denon so much you should get another one!!
https://www.crutchfield.com/S-hYM4qohClT7/shopsearch/denon_receiver.html?XVINQ=MI2&XVVER=PEH&...

anyone??