JBL PartyBox 300 vs PartyBox 310

Sep 28, 2025 03:05 PM By Cai

2

Interesting that the Low-Frequency Extension on the 310 is a lot lower than the 300 when they are both advertised as having the same range of 45 Hz - 20 KHz. Why is this?

You’ve asked a deceptively deep question, haha. tldr; We measured that the PartyBox 310 has more volume relative to the normalized frequency response at deeper bass frequencies than the PartyBox 300, so you can hear lower frequencies without them getting masked by louder ones. We also don’t know how JBL performs tests, or if both speakers were measured by the brand consistently the same way.

Basically, both speakers can, and do, reproduce frequencies below the LFE figures (as seen in the graphs), but because of their different tunings and auditory masking, you effectively can’t perceive the frequencies below the LFE figures we measured. The PartyBox 300’s more conservative bass means that the other, louder frequencies coming from the speaker overwhelm the quieter ones in a higher bass register, rendering your perception of the bass extension as not as deep. On the PartyBox 300, 45Hz was measured as about 13.5 to 14dB quieter than the normalized frequency response, which is well below the -6dB cutoff for LFE. In contrast, the PartyBox 310 plays back 45Hz only ~1dB quieter than the normalized frequency response, meaning you can still perceive that frequency, and it’s not overwhelmed by other relatively loud frequencies coming out of the speaker.

We also don’t know the conditions under which JBL measures their speakers, or if these models were tested consistently the same way as each other by the manufacturer. One hint is in the PartyBox 310’s specs, where it states that the range is ‘45Hz to 20kHz (-6dB),’ which I interpret as being loosely similar to our method. But I don’t know if that’s a correct interpretation, what the speaker settings are when they test, or how their testing otherwise differs from our method. I didn’t see if JBL provides that detail for the PartyBox 300, besides the same frequency range, which makes it a little more difficult to make a direct comparison using JBL’s specs between the speakers or between our methodology and the brand’s.

If I can offer some help here, we tested both PartyBoxes the same way for a direct comparison, even if our results don’t perfectly match the brand’s specs.

Interesting that the Low-Frequency Extension on the 310 is a lot lower than the 300 when they are both advertised as having the same range of 45 Hz - 20 KHz. Why is this?