LSi 15's Not putting out bass.

jomat77jomat77 Posts: 8
edited March 3 in Troubleshooting
Hi folks, very new to the stereo equipment scene and I have a few questions about a system I just picked up.
HK AVR7300
Polk LSi 15's
Polk LSi C
Polk DSW Pro 400

Very happy with the system so far but have a few questions.
1. Why am I not getting punchy midrange bass out of the 15's. The woofers seem to be working but they just don't put out much bass. My DSW sub works fine, but I do notice a hum if the sub volume is turned up to loud. Otherwise all of the speakers sound great...even when turned up pretty loud. Any suggestions on how to get more punch out of those woofers in the towers?
2. I want to get more speakers to add to the surround sound. I want to stick with this same series. Should I get the 7's, F/X's, or both? My room is 12x20.
3. If I need a separate amp for the woofers on the towers...which one would you suggest. Would like to stick with HK components but open to all suggestions. $500 or less (used)
4. Finally, I read somewhere about reversing the polarity? of the woofers on the 15's and this supposedly gets more out of them. Just wondering if anyone heard of this before. I'm not messing with that stuff, just wanted to see if there's anything to that.

Thank you in advance for any help and suggestions.

Comments

  • LegenderLegender Posts: 443
    I would suspect most here would tell you that you're under powering them with your 110 watts per channel at 8 ohm, or 125 with only 2 channels AVR. The LSi15s are 4 ohm speakers and you keep turning them up loud you're bound to break something....
    You need to get an amp between the AVR and the speakers that will drive 4 ohms powerfully.
    You need a separate amp for the speakers period.

    You will be much happier with the system once they are fed the proper power.
    Music: Oppo103 - Parasound JC2 - Parasound A21- SDA 3.1
    Theater: Denon 3808 - B&K 7500/Emotiva XPA-3- RTi12, CSi5, RTiA7x4, PSW505
    Sleeping: Marantz 70005 - Harman Kardon 2400 - SDA 2
    2 Channel: Cary 306 SACD - Canary Audio 906 - Pass Labs x250 - PS Audio Perfectwave DAC, Polk LSiM705, SVS SB13 Ultra
    Office: Dell Optiplex, Emotiva XDA-2, Adcom 5500, LSiM 703
    Spares: Yamaha CA-810; LSi 15; Kenwood Basic M2a, Yamaha M60/M80, Polk Monitor 7, SVS SB13 Ultra
  • jomat77jomat77 Posts: 8
    edited March 3
    Okay, I was prepared for that scenario so I appreciate that feedback. That said, are there any amps you suggest? Also, I'm a novice here so bare with me but...on the terminals of my 15's there are gold plates that span the upper and lower terminals. I only have one set of wires going to both towers and they are connected to the "front" channels on my receiver. Should they be hooked up differently. Sorry for the novice question but again...very new to all of this stuff.
    Post edited by jomat77 on
  • F1nutF1nut Posts: 39,604
    Your AVR is not rated to drive 4 ohm loads, your speakers. Do NOT turn the volume up as you will cook the AVR and likely damage the speakers as well. Any separate power amp you buy must be rated to drive 4 ohm loads, most are.

    You have the speakers connected properly.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


  • tonybtonyb Posts: 29,044
    When you add an amp, you'll hook the speakers up differently. You'll use one set of RCA interconnects from the receivers front left and right pre-outs, to an amp's left and right input. Then you'll connect the speaker wire to the amp, instead of the receiver.

    Used amps under 500....Parasound HCA 1200 OR 1500, B&k, Carver, a few others too but those are what most use when budget concerns are a priority.
    HT SYSTEM-
    Pioneer elite vhx 21
    Sony 4k BRP
    Tad 803 bookies
    Polk 500 surrounds
    Polk s35 center
    SVS SB-2000
    Sonos

    Music-

    Joule la-100 pre
    B&k 1403 amp
    Cary xciter dac
    Cullen modded Sonos
    ERA D5 bookies

    Cables-
    Acoustic zen Satori speaker cables
    Analysis plus crystal oval ic's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable
  • jomat77jomat77 Posts: 8
    @F1nut that said...If I want to stick with the LSi series and run the full 7.1 surround, will I need to purchase a single 7 channel amp or multiple amps? How many watt amp would I need to really get the most out of those speakers (using the AVR 7300)? What is the best way to set this up if I were to add a pair of F/X's and a pair of 7's to the system? Thank you for the advice.
  • jomat77jomat77 Posts: 8
    @tonyb Thank you for the input. Are there any H/K amps that you might recommend pairing up with my system? One that might be from the same era as the 7300. (2004)
  • tonybtonyb Posts: 29,044
    I'm not up to speed on vintage HK amps, but I assure you, the Parasound or B&k choices would be better sounding imho. Having the same brand as your receiver means nothing, unless you just like having the same name plates, visually. Sound quality wise though, I'd look beyond HK in an amp.
    HT SYSTEM-
    Pioneer elite vhx 21
    Sony 4k BRP
    Tad 803 bookies
    Polk 500 surrounds
    Polk s35 center
    SVS SB-2000
    Sonos

    Music-

    Joule la-100 pre
    B&k 1403 amp
    Cary xciter dac
    Cullen modded Sonos
    ERA D5 bookies

    Cables-
    Acoustic zen Satori speaker cables
    Analysis plus crystal oval ic's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable
  • jomat77jomat77 Posts: 8
    @tonyb I did want to try to keep the same name plates if possible. Only because I thought that components were engineered to go with one another. That said, I have no real issues crossing brands.
    I'm just not sure how many channel amp I would need to get and how many watts I'd need to push these speakers I have...and want to add.
  • cfrizzcfrizz Posts: 12,907
    Welcome to Club Polk! Below are two amps that will power your hungry LSI speakers to their full potential, which is what you want to hear everything your speakers have to offer. Until you get an amp, please watch how high you push the volume knob.

    It is more money then you have allocated, but it will be well worth the expense. An amplifier is something that you can keep through all other changes to your system. So start saving more money and keep a watch on Audiogon for a good deal.

    If you want new, look at Outlaw Audio and Emotiva.

    https://www.audiogon.com/listings/multi-ch-b-k-reference-200-5-five-channel-power-amplifier-11456-2018-01-18-amplifiers

    https://www.audiogon.com/listings/lis8fc5f-sunfire-cinema-grand-200-5-serviced-bill-flannery-multi-ch
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony Bravia KDL-40R510C TV, Polk S60 Main Speakers, Boston VR-920 Center Channel, SVS NSD-12 SB12 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers
  • tonybtonyb Posts: 29,044
    There's a 5 channel B&k amp right now in our own flea market for 700.
    HT SYSTEM-
    Pioneer elite vhx 21
    Sony 4k BRP
    Tad 803 bookies
    Polk 500 surrounds
    Polk s35 center
    SVS SB-2000
    Sonos

    Music-

    Joule la-100 pre
    B&k 1403 amp
    Cary xciter dac
    Cullen modded Sonos
    ERA D5 bookies

    Cables-
    Acoustic zen Satori speaker cables
    Analysis plus crystal oval ic's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable
  • cfrizzcfrizz Posts: 12,907
    tonyb wrote: »
    There's a 5 channel B&k amp right now in our own flea market for 700.

    Jomat, you should jump on this deal, it will make all the difference in the world to your system.
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony Bravia KDL-40R510C TV, Polk S60 Main Speakers, Boston VR-920 Center Channel, SVS NSD-12 SB12 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers
  • jomat77jomat77 Posts: 8
    edited March 3
    @cfrizz thank you for the input. I'm glad I posted on here before I damaged the system. I was cranking it up a little. I got a little excited about hearing music in my house that sound really good! lol
    Nothing distorted and the receiver never got hot, so hopefully I didn't damage anything.
    Can I still use the system as it is with the volume low, or should I not even be using it until I get one of these amps? I will be pretty bummed out if that's the case. I can't afford anything that expensive right now. I only paid $675 for everything I got which I thought was a decent deal. I'll have to keep saving like you said. I don't want to wreck anything and I'd definitely like to hear what these speakers are capable of! Thank you again for the advice and the links.
    Post edited by jomat77 on
  • jomat77jomat77 Posts: 8
    Unfortunately I can't swing it at the moment. I will keep my eyes out for stuff though.
  • cfrizzcfrizz Posts: 12,907
    Yes of course you can still use your system, just be careful with how loudly you play it.

    You didn't do any damage, you would know if you did, because something wouldn't sound right.
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony Bravia KDL-40R510C TV, Polk S60 Main Speakers, Boston VR-920 Center Channel, SVS NSD-12 SB12 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers
  • jomat77jomat77 Posts: 8
    Its awesome to know this system can sound even better. I was amazed at the sound I was already getting out of it. Benefits of not knowing any better I suppose! :)
  • K_MK_M Posts: 1,015
    edited March 4
    You are using a sub......
    Define.."not much bass"?

    Could it be room related, or sub crossover frequency related?

    If anything the Lsi15 have an abundance of midbass sound.
    What frequency range is lacking?

    What is the room layout, and where are you sitting in relation to the speakers?
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4,SDA 3.1TL, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
    B+W-
    Epos-
    Infinity-
    Advent-

  • haimochaimoc Posts: 1,006
    To me, LSI15 speakers are weak and shy with bass. I owned a pair and powered them with Plinius 9200 integrated amp.
  • bcharlesxplbcharlesxpl Posts: 10
    I'm in no way an expert and new to high end audio with my LSI7's. Just want to say be careful cause I just fried one of my speakers. Probably something dumb I did that I should have picked up on before having issues.
    Also, I'm jealous of your LSI15's. I love the sound from the LSI7's and can only imagine how those sound.
  • mpitogompitogo Posts: 249
    All good suggestions but in 2005 the HK7300 was top of the line, In a review here is what they said

    “It's refreshing to see that HK does not fudge its amplifier specs. In surround mode, the AVR 7300's seven channels are rated at 110Wpc into 8ohm, 20Hz–20kHz, <0.07% THD, all channels driven. The 2-channel output is rated at 125Wpc, both channels driven.”
    Read more at https://www.soundandvision.com/content/harman-kardon-avr-7300-av-receiver#L8VJk6Qz42juOTMO.99

    Anyway to me that seems like still a decent amount of power considering most now a days spec out wpc @1khz and only 2 ch driven. So this leads me to think it maybe calibration, crossover, speaker setting or phase. Check to see if the previous owner has any settings for their room. Best would be to factory reset to get a good baseline. If you want the towers to go full range, check if they’re set to large. If the towers are also setup in parallel check the cabling so both are in phase, sidefiring subs you may get cancellation.

    Enjoy, that is a good deal of a system you have there.

    Music-2.0 Raidho D-3.1 | Audio Research Ref 40 | Jeff Roland 925 | Esoteric Grandioso K1 | Transparent Reference, IC, Speaker and Power | HRS SXR Rack
  • LegenderLegender Posts: 443
    edited March 9
    Not that this answers any of your questions, and might just introduce more, but this was discussed in 2005, here:
    http://forum.polkaudio.com/discussion/30650/harman-kardon-7300-plus-lsi15s
    Music: Oppo103 - Parasound JC2 - Parasound A21- SDA 3.1
    Theater: Denon 3808 - B&K 7500/Emotiva XPA-3- RTi12, CSi5, RTiA7x4, PSW505
    Sleeping: Marantz 70005 - Harman Kardon 2400 - SDA 2
    2 Channel: Cary 306 SACD - Canary Audio 906 - Pass Labs x250 - PS Audio Perfectwave DAC, Polk LSiM705, SVS SB13 Ultra
    Office: Dell Optiplex, Emotiva XDA-2, Adcom 5500, LSiM 703
    Spares: Yamaha CA-810; LSi 15; Kenwood Basic M2a, Yamaha M60/M80, Polk Monitor 7, SVS SB13 Ultra
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