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Harman Kardon HK 3700

Stereo receiver with wired networking

34 Reviews | 15 questions - 47 answers

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Item # 532HK3700

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Our take on the Harman Kardon HK 3700

Harman Kardon receivers are known for combining a stylish design with sound that packs a punch. That's just what you'll get with their HK 3700, along with some pretty cool features for enjoying digital music. With connections for an iPhone®, USB thumb drive, CD player, and turntable, along with network connectivity, there are lots of ways to enjoy all your music with this versatile receiver. It's a great option for music lovers seeking a stereo system with classic sound and modern connectivity.

Old school sound meets new school features

Harman Kardon receivers are known for combining a stylish design with sound that packs a punch. That's just what you'll get with their HK 3700, along with some pretty cool features for enjoying digital music. With connections for an iPhone®, USB thumb drive, CD player, and turntable, along with network connectivity, there are lots of ways to enjoy all your music with this versatile receiver. It's a great option for music lovers seeking a stereo system with classic sound and modern connectivity.

Clean sound from a new "green" technology

Harman Kardon has been working to make their receivers more energy efficient without compromising sound quality. The HK 3700 represents the fruits of their labor. It utilizes Harman Kardon's GreenEdge™ technology. Rather than redesigning the Class A/B amplification stage, this receiver features a new digital power supply. Unlike conventional analog power supplies, this new digital design uses less energy, fewer raw materials, and produces less heat. The result is a lightweight, efficient, eco-friendly receiver that delivers the same sonic benefits we've come to expect from this audio innovator.

Stream music over your home network

The HK 3700 is Internet-ready — connect it to your network router to open up lots of wireless listening possibilities. Stream music from your computer over your wireless home network. You can also listen to thousands of free Internet radio streams from stations around the world, going far beyond the reach of the built-in AM/FM tuner. Download the free Harman Kardon remote app to your iOS® or Android™ device and use it to control the receiver and play locally-stored songs wirelessly through your system. App control requires a wireless home network and a wired connection between your receiver and your network router.

Connect your iPhone or USB thumb drive

The USB port on the HK 3700's front panel lets you plug in your iPhone, iPod®, or iPad® to listen to music. This connection bypasses the device's digital-to-analog converters in favor of the receiver's high-performance DACs. That means you'll get smoother sound with more detail than your iPhone can deliver on its own. You can also use the receiver's remote to control playback with connected Apple® devices. The USB port is also great for playing digital music files on thumb drives by popping them into the USB port.

Product Highlights:

  • 85 watts x 2 (stereo) into 8 ohms (20-20,000 Hz) at 0.07% THD
  • GreenEdge technology combines an energy-efficient, lightweight digital power supply with standard Class AB amplification
  • Internet-ready for listening to music from a networked PC
    • stream music from a DLNA-compatible PC or network-attached storage (NAS) device
    • built-in support for listening to free Internet radio station streams with vTuner
  • 24-bit 192kHz digital-to-analog converters
  • free Harman Kardon Remote app lets you use your Apple or Android device as a Wi-Fi® remote
  • front-panel USB port for connecting an iPhone, iPad, iPod, or thumb drive (WAV, MP3, WMA)
  • 6 pairs of RCA stereo inputs, including phono input (MM)
  • preamp output for a powered subwoofer
  • stereo RCA outputs for recording
  • A/B speaker switching
  • binding post connectors for two pairs of speakers
  • 1/4" headphone jack
  • Ethernet port for network connection
  • AM/FM tuner
  • remote control
  • 17-3/8"W x 5-1/4"H x 12-15/16"D
  • weight: 13.2 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • Stereo receiver with attached 6' AC power cord
  • Remote control
  • 2 "AAA" batteries
  • FM antenna
  • AM antenna
  • Quick Start Guide
  • Important Safety Instructions

Harman Kardon HK 3700 Reviews

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(34 Reviews)
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Hands-on research

Product Research

Audio Section
Network & Tuner Functions
USB/iPod Integration
Remote Control

Audio Section

Output Power: The Harman/Kardon HK3700 stereo receiver features a 85 watt x 2-channel (8-ohms, 20Hz-20kHz, THD 0.07%) amplifier for great sound quality with little distortion even at high volumes.

High-Resolution 24-bit/192kHz DAC: This stereo receiver is equipped with a 24-bit/192-kHz DAC for excellent sound quality reproduction that is natural sounding.

Harman Volume: Harman volume is an advanced digital signal processing technology to control playback volume. It evens out the volume level on everything you watch, improving your listening experience. Once you choose the volume level, Harman Volume does the rest. It helps you avoid volume increases from commercials, volume differences when you change channels or switch sources, and brings out the dialog.

Analog Inputs/Output: The Harman/Kardon stereo receiver features five analog stereo RCA inputs to connect up to five audio components, and one stereo RCA record output to connect to a CD-recorder and other recording device. Included in the five analog inputs is a Phono input (MM) for vinyl playback.

Phono Input: In addition to the five analog inputs, the stereo receiver is fitted with a Phono input (MM) for vinyl playback.

A & B Speaker Terminals: This receiver features two sets of speaker outputs (A & B), each with binding-post terminals. You can independently turn on or off each pair of speakers, as well as play both pair of speakers. The speaker pairs are wired internally in parallel. These binding post terminals will accept bare wire (up to 10AWG), pin-connectors, and banana plugs (single or dual).

Subwoofer Output: The stereo receiver is equipped with a mono-subwoofer output for connecting a powered subwoofer. The output is full-range, so you will need to connect a powered subwoofer with a built-in crossover.

Headphone Jack: There is a full-size (1/4") headphone jack on the front panel. When headphones are plugged in the speaker outputs are automatically muted.

Network & Tuner Functions

Ethernet LAN Port: The H/K stereo receiver is fitted with a RJ-45 Ethernet (LAN) port to connect the receiver to your home network to access your DLNA music server or Internet Radio.

Internet Radio (from vTuner): You can also listen to Internet radio stations using the vTuner Internet Radio Station database service particularly customized for this unit, providing a database of numerous radio stations around the world. You can search for Internet Radio stations by Location, Genre, New, Popular, or Podcast. You can store up to 30 of your favorite stations.

DLNA Certified: The HK3700 is DLNA (Digital Living Network Alliance) 1.5 and Windows 7/8 compliant for audio networking. This means it's easier for you to access and enjoy digital music stored on your PC. Compatible music files include MP3 (32-320kbps; 8-48kHz) and WMA (5-192kbps; 8-48kHz). You can use your PC to play music content through your audio system, or use the H/K receiver to browse and play music files on computer's hard drive. You can control playback of your streamed audio files from the network receiver's remote control. The receiver also supports ID3-Tag and META tag information so song title, artist name, and album name can be displayed from the unit's front-panel display.

AM/FM Tuner: The Harman/Kardon stereo receiver features a built-in AM/FM tuner with manual, seek, and preset tuning (auto/manual). You can store up to 30 AM/FM presets (in any combination). You're able to scan through these presets (5-seconds each) to help you search for your favorite music. You also can tune directly to a station using the numeric keypad on the included remote control.

USB/iPod Integration

Front-Panel USB Port: This stereo receiver is equipped with a front-panel USB (type-A) port that allows you to enjoy playback of MP3 (32-320kbps; 8-48kHz) and WMA (5-192kbps; 8-48kHz) music files from a USB mass storage class memory device; such as select Android smartphones (Froyo/Gingerbread OS only), portable MP3 players, or USB thumbdrives (not compatible with USB HDDs). The USB device must be formatted in FAT or FAT32. Using the unit's front-panel display and included remote control, you can browse your stored music files on your connected USB memory device. USB portable audio devices that can be charged via USB will be charged when plugged into the network stereo receiver's USB port (5V/0.5A).

iPod/iPhone Direct: The USB (type-A) port on the front-panel provides convenient connection for your iPod/iPhone so you can listen to your stored music and music apps through the H/K stereo receiver. The iPod/iPhone USB digital connection means that the digital audio signal from your iPod/iPhone is transmitted directly to the system, minimizing noise interference and allowing use of the receiver's DAC, not the DAC in your iPod/iPhone. This results in more precise sound reproduction. You can choose to control your Apple device from its clickwheel/touchscreen or from the receiver.. Basic playback functions (such as Play/Pause, Previous/Next Track) can be controlled by the receiver's remote. Song/artist information on your iPod/iPhone will display on your connected the unit's front-panel display. Your iPod/iPhone's battery will be charged while connected to the receiver. Using the Lightning- or Dock-cable that came with your Apple device to connect directly to the H/K stereo receiver, iPod/iPhone compatibility is as follows (as of 9/25/2014):

Apple Device Generation Tested Version Media Type Control Type Display Type Charge
Audio Video Remote iPod/iPhone Artist/Song Text Track Info
iPad 1 5.1.1 Y N Y Y Y Y Y
2/3 8.0 Y N Y Y Y Y Y
4/air 8.0 Y N Y Y Y Y Y
mini 8.0 Y N Y Y Y Y Y
iPhone 2G 3.1.3 Y N Y Y Y Y Y
3G 4.2.1 Y N Y Y Y Y Y
3GS 5.1.1 Y N Y Y Y Y Y
4 7.1.2 Y N Y Y Y Y Y
4S 8.0 Y N Y Y Y Y Y
5/5C/5S 8.0 Y N Y Y Y Y Y
6/6+ 8.0 Y N Y Y Y Y Y
touch 1st 2.2.1 Y N Y Y Y Y Y
2nd 4.2.1 Y N Y Y Y Y Y
3rd 5.1.1 Y N Y Y Y Y Y
4th 6.1.2 Y N Y Y Y Y Y
5th 8.0 Y N Y Y Y Y Y
2nd 1.1.3 Y N Y Y Y Y Y
3rd 1.1.3 Y N Y Y Y Y Y
4th 1.0.4 Y N Y Y Y Y Y
5th 1.0.2 Y N Y Y Y Y Y
6th 1.2 PC Y N Y Y Y Y Y
7th 1.02 PC Y N Y Y Y Y Y
classic 80GB 1.1.2 Y N Y Y Y Y Y
120GB 2.0.1 Y N Y Y Y Y Y
160GB 2.0.4 Y N Y Y Y Y Y
Note: Apple iPod/iPhone software updates may change functionality results. If you download a newer software version, you may need to reset the unit and your iPod/iPhone to regain functionality. If this doesn't work, you may need to wait until a newer software update is available.

Remote Control

Remote Control: The HK3770 comes with an IR remote control for wireless operation of the receiver and your connected USB or iPod device.

H/K Remote App: Downloading the free Harman/Kardon Remote app from the iTunes App store onto your Apple iOS (5.0+) device or from the Google Play Store onto your Android (2.2+) device lets you control the HK3700 receiver from your smartphone or tablet device. You'll also be able to control your Apple iOS or Android device's stored music from the Harman/Kardon Remote app.

  • Source Selection: You'll be able to access and select all of the receiver source inputs (Analog 1-5 inputs, Phono input, DLNA, vTuner, USB, or iPod) through your Apple iOS or Android device with the Harmon/Kardon Remote app installed.
  • Audio Settings: You have control of the receiver 's Volume and other audio adjustments through the Harman/Kardon Remote app and your Apple iOS/Android device.
  • Music Control: You can control all the music you have stored on your compatible Apple iOS/Android device through the Harman/Kardon Remote app. You'll be able to search your music by Song, Artist, Album, Playlist, and Genre. You also get basic playback functions such as Play/Pause, Previous/Next Track, Fast Forward/Rewind, and Repeat/Random. To access music apps, you'll need to exit the Harman/Kardon Remote app and select your desired music app on your iOS or Android device.

IR Input/Output: There is one minijack (3.5mm) remote input and one minijack (3.5mm) remote output on the rear panel of this unit. If the receiver is placed behind a solid or smoked glass door, the obstruction may prevent the front panel IR sensor from receiving commands from the remote. If the unit is positioned so the front panel IR sensor cannot receive commands from the remote, an optional IR repeater system (sold separately) may be connected to the Remote IR In jack and positioned to accept commands from the remote. The Remote IR Out jack can be connected to the remote input jack of compatible equipment to relay commands to that equipment.

Trigger Output: This minijack (3.5mm) output sends a 12-volt DC turn-on signal to another component that accepts a 12-volt trigger, such as a CD player or powered subwoofer.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

seemed to have the right features for the price, the reviews were good, I'll see if it works out [ Stephen  Nov 09, 2018 ]
This is good product at an excellent price [ Hector  Jun 16, 2018 ]
Harmon Kardon reputation, quality and price just right for our needs. [ Edward B.  Apr 08, 2018 ]
I already had some idea of what I wanted, could have gotten it somewhere else, but..... the basic reason was to choose Crutchfield. I'm very grateful for my years of infrequent but completely satisfied purchases...Thank you, Milt [ MILTON  Mar 17, 2018 ]
My old tuner/amp is a Harmon Kardon. Still working but getting tired after 29 years of service. Time for an upgrade, hope this one lasts as long! [ Don  Jan 27, 2018 ]
Need Internet access for streaming music [ William  Sep 12, 2017 ]
have a harman kardon430 and it lasted over 30 years [ bruce william  Aug 18, 2017 ]
I am working with a music room. All these items are part of my music room. [ Jose  Jul 11, 2017 ]
Trustworthy company, trustworthy product [ Dan  Jul 11, 2017 ]
I chose the HD receiver as this was my brand of choice in the past. Great product, however, I cannot get my TV speakers set up to provide sound via the receiver. [ Jerry  Jun 20, 2017 ]
awesome Receiver, I hope [ Tim  Jun 17, 2017 ]
I think Harman Kardon is the best,I bought my first one in 1984 [ david  May 02, 2017 ]
USB input for Ipod/Iphone music [ GARY A  Apr 20, 2017 ]
It had the most features and is fairly compact [ Rebecca  Feb 26, 2017 ]
It had all the features we wanted. We still use a CD player, Phonograph, and Cassette deck, but also play our iPhones through the system. This model supports all of these input devices. [ William  Feb 14, 2017 ]
Multi-room, DLNA certified receiver [ DHAWAL  Nov 27, 2016 ]
Looks like a great unit for my garage. Replacing my 40 yr old Marantz receiver from old girl is getting tired [ Gerald  Nov 24, 2016 ]
Good reputation, nice design and good specs. [ Brian  Oct 13, 2016 ]
stereo receiver w/usb input [ Gary  Oct 06, 2016 ]
This Harmon Kardon has an elegant design, has the power level we needed, and is known for great sound. [ ARMANDO  Oct 03, 2016 ]
During a chat session with Chip, I explained how I wanted to use a new receiver, and he suggested the HK 3700, which appears to meet my needs perfectly. Chip's Bio: [ David  May 29, 2016 ]
Like the name brand and it fit my needs. [ Jackie  Mar 29, 2016 ]
I needed a receiver with a sub-woofer output for my Bose speaker system, and a USB port to play my iPod. All other features are a bonus. My past experience owning a Harman Kardon amplifier was that it was premium equipment. [ Robert  Jan 26, 2016 ]

15 questions already asked

I have connected an I-pad via usb so that I could play pandora over the stereo . Works fine for that purpose . [ Malcolm  Nov 05, 2018 ]
I've not had success connecting this to a PC. [ DHAWAL  Nov 12, 2018 ]
I don't connect my computer using the usb cable [ Jose  Nov 06, 2018 ]
Yes. I have connected a laptop by this method. I have also connected both new and old style Ipad's Using USB to lightening. Works great. [ MARVIN R  Nov 05, 2018 ]
Yes [ Jose  Sep 06, 2018 ]
I don't know as I have ceased hooking up anything because of old age [ EVERETT A  Sep 06, 2018 ]
don't know. I had help in setting it up and cannot get to the back of it to see. I am a handicapped person. BUT I had excellent help from the Crutchfield representative. He knows [ EVERETT A  Nov 30, 2017 ]
Unit does have a subwoofer connection on back next to speaker connections. [ Robert C.  Nov 28, 2017 ]
Yes, there is one RCA jack for a subwoofer pre-out signal. [ Randall  Nov 28, 2017 ]
Plug it in and listen is all you need. [ WILBERT  Nov 07, 2017 ]
Plug in and go. Could not be easier [ Diane  Nov 06, 2017 ]
plug and play [ john  Nov 06, 2017 ]
No other pieces needed, just plug in your turntable and go. [ DAVID  Nov 06, 2017 ]
If your turntable uses a magnetic cartridge, you can plug it into the phono inputs. The phono input has a preamp that will amplify the low signal from the cartridge to drive the speakers. However, if your turntable uses a ceramic cartridge, it would need to be connected to an auxiliary input since the signal from this type is already strong enough to drive the speakers. [ Jon  Nov 06, 2017 ]
No, no other pieces. As long as your turntable does not have a preamp, you just plug it into Phono. If your turntable has a preamp, use one of the inputs marked Analog Audio In. [ Judith  Nov 06, 2017 ]
Sorry, this question is way above my pay grade. I don't even understand the question. [ NICHOLAS J  Jun 04, 2017 ]
I have read through the owners manual and was unable to verify if that was possible. So I would say not likely. Go on line and check out owners manual, [ Robert C.  Jun 03, 2017 ]
I dont know never tryed the rec is great sounds very nice dont think u need one [ john  May 31, 2017 ]
No, I use a usb cord to hook up my ipod or iphone. Its kind of old school. [ Kelly  May 01, 2017 ]
No, not without an adapter. [ MARK  Apr 30, 2017 ]
Yes. Works great [ Diane  Apr 30, 2017 ]
It will handle both. [ Joseph  Feb 05, 2017 ]
Yes as long as you pair them on the same Channel. [ MARK  Feb 05, 2017 ]
Yes. It has a dedicated CD player input [ Scott  Nov 16, 2016 ]
yes, i believe it has a dedicated CD input, although I don't know that the pre-set is any different than the other inputs. [ Alec J.  Nov 15, 2016 ]
Yes it will. My unit has been great. Good Listening ! [ MICHAEL  Nov 15, 2016 ]
I would actually be interested in knowing that as well. Also, my unit plays beautifuly, then just shuts down. I cannot fugure it out. It will come back up for maybe 5 min, then just shuts down again. [ Franklin R.  Nov 15, 2016 ]
yes this unit will take a CD player [ CHARWON R  Nov 15, 2016 ]
Yes, I have an iPod, CD, and turntable connected to it [ Karl  Nov 15, 2016 ]
Yes [ JEFFREY  Nov 15, 2016 ]
Yes, it will. [ David B  Nov 15, 2016 ]
Yes can drive 2 pairs 8 ohm speakers at the same time but will be at half power for each pair if both are on at the same time. [ Gerald  Apr 20, 2016 ]
That is how we have it set up. Four speakers in one large room.... [ Karl  Apr 19, 2016 ]
Yes, that's a safe assumption. It probably wouldn't drive 4 ohm speakers paralleled at 2 ohms though. [ TIMOTHY J  Apr 19, 2016 ]
Yes, this has Speaker A and Speaker B channels, which can each drive a pair of 8 ohm speakers (together or independently) [ TOBIAS  Apr 19, 2016 ]
Not sure--I'm only powering two Klipsch ceiling speakers. However, it's a great receiver. [ JEFFREY  Apr 19, 2016 ]
I Used a standard network cable directly to the router. I listen to Internet radio almost exclusively now. Love it [ Scott  Nov 05, 2015 ]
Since there's no built-in WIFI, you have to connect with an Ethernet cable from your router. [ JEFFREY  Nov 05, 2015 ]
You should be able to with Ethernet connection and remote app on your mobile device. [ Gerald  Apr 03, 2015 ]
I am not aware of a way to do this. Rhapsody requires client software to exist on the receiving device (i.e. the app you load on your computer). The Rhapsody client does not exist on the HK3700 so it cannot receive and play Rhapsody directly from the internet. And I am not aware of a way to stream Rhapsody from a PC to the HK3700, maybe someone else does. I use Plex to stream mp3 files on my Mac to the HK3700. But Plex cannot stream out from a Rhapsody stream in that I can see. On the web it looks like when using Rhapsody on a home stereo receiver you look for one that comes with the Rhapsody client built in. On my HK3700 I stream either from 1) computer resident files via Plex or 2) vTuner via the stations/sites they support. For me this is more than sufficient. [ JONATHAN  Apr 02, 2015 ]
No answer for that. I use it mostly for streaming Internet radio, & it works flawlessly for that. [ JEFFREY  Apr 01, 2015 ]
No [ SCOTT  Apr 01, 2015 ]
Does this reciever have the traditional h/k sound quality [ Jon  Mar 07, 2015 ]
The internet radio works very well, and it sounds great. [ DENNIS  Apr 23, 2014 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Jeff  Apr 15, 2014 ]  Staff